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Intel Core i5-8400 CPU Review






Today marks a milestone for Intel with the release of the first mainstream six-core CPUs in the Core i5 and Core i7 segments and the first quad-core Core i3 CPUs. Core counts have skyrocketed this year across the board, first with High-End Desktop segments hitting a staggering eighteen cores, and now mainstream platforms finally breaking away from a quad-core ceiling. We have Intel’s six-core, six-thread Core i5-8400 on hand, and we’ll put it through its paces and see if more cores actually matter to anything more than benchmarking. Last generations i5-7400 had 4 cores, 4 threads, and has a 3.0 GHz clock speed that could Turbo Boost to 3.5 GHz. This generation, you get 6 cores at a slightly reduced 2.8Ghz, but Turbo Frequencies can hit 4.0 GHz, all while staying in the same 65W TDP window.

Do two extra cores really make much difference for mid-range mainstream platforms? We think you’ll be surprised at the answer.

ProClockers would like to thank Intel for sending the i5-8400 over to check out!

8th Generation Processor segment comparison.

Intel’s take on the 8th Generation Core CPU’s

The 8th Generation Intel® Core™ processors redefine mainstream desktop PC performance with up to six cores for more processing power—that’s two more cores than the previous generation Intel® Core™ processor family—Intel® Turbo Boost Technology 2.0 to increase the maximum turbo frequency up to 4.7 GHz, and up to 12 MB of cache memory.1 Intel® Hyper-Threading Technology (Intel® HT Technology)1 delivers up to 12-way multitasking support in the latest generation of Intel® Core™ processors. For the enthusiast, the unlocked 8th Generation Intel® Core™ i7-8700K processor provides you the opportunity to tweak the platform performance to its fullest potential and enjoy great gaming and VR experiences. 

The new 8th Generation Intel® Core™ processor family delivers:

  • An impressive portfolio of standard and unlocked systems for a broad range of usages and performance levels
  • New system acceleration when paired with Intel® Optane™ memory to deliver amazing system responsiveness1
  • Intel® Turbo Boost Technology 2.0 to give you that extra burst of performance when you need it
  • Intel® Hyper-Threading Technology (Intel® HT Technology), which allows each processor core to work on two tasks at the same time, improving multitasking, speeding up workflows, and accomplishing more in less time
  • DDR4 RAM memory technology support, which allows systems to have up to 64 GB of memory and up to 2666 MT/s memory transfer speeds
  • The ability to set an overclocked ratio per core with unlocked processors,1 when paired with select chipset SKUs, to provide you more control and more granularity for overclocking2 your platform

Die Shot of Intel’s 8th generation Core processors.

Eighth generation CPU’s will not work on older chipsets such as Z270 and Z170, and conversely, 6th and 7Th generation CPU’s will not work on 300 series boards, despite using the exact same socket. Peak power draw is significantly higher after the jump to 6 cores. Increased power delivery capabilities are one major reason for lack of backward compatibility. The next major reason is improved memory routing for out of the box support of up to DDR4-2666Mhz over last generations DDR4-2400. While XMP speeds can easily surpass the 4000 MHz mark, those speeds are technically a factory supplied overclock, with no guarantee of support or compatibility. Intel has also updated the memory subsystem to expand the memory multipliers to support up to 8400 MT/s and added a real-time memory latency control, a feature previously only found on HEDT platforms.

Features & Specifications

Experience Amazing
8th Generation Intel® Core™ processor-based desktop platforms are loaded with new and enhanced features to deliver amazing experiences that five-year-old systems can’t handle. 

Incredible VR
Great VR experiences involve the entire platform, not just any one component. The ideal combination of processor, graphics, I/O connectivity, display, and audio are required. A high-performance processor is key to achieving a balanced platform to make your VR experiences great. Attach your premium head-mounted display (HMD) to an Intel® Core™ i7 or i5 processor-based PC, and prepare to be amazed.

Great Gaming
Outstanding gaming experiences extend beyond your personal smooth gameplay to your entire gaming community. The 8th Generation Intel® Core™ processor family makes it easy to share those experiences by live-streaming or recording, editing, and posting your epic highlights. To perform at your best, get a great gaming PC powered by an 8th Generation Intel® Core™ i7 processor that lets you live—and share—the ultimate gaming experience.

Ultra-high Definition Entertainment
To play premium movie streams in stunning 4K UHD, get an advanced platform that supports the latest media technologies enabling today’s great entertainment. Desktop computers based on the 8th Generation Intel® Core™ processors integrate advanced media technologies that bring premium, high-quality content to your desktop, including:

HEVC 10-bit encode/decode, VP9 10-bit decode:
Delivering smooth streaming of premium 4K UHD entertainment to your PC from leading online providers
Providing full-size, screen-immersive viewing experiences with 4K video and 360-degree viewing
Enabling incredible 4K video creation and sharing with ease

Ultimate Protection Built Into the Silicon

8th Generation Intel® Core™ processors integrate hardware-level technologies that strengthen the protection of your enabled security1 software. Hardware-based security helps you experience online and offline activities with peace of mind, enabled by features that include:

Intel® Software Guard Extensions (Intel® SGX)1 to help applications protect your system and your data

Intel® BIOS Guard and Intel® Boot Guard to help protect your system during startup

Scalable Portfolio of Processors
The 8th Generation Intel® Core™ processor family is a great investment in your desktop experiences—whether for gaming, entertainment, or general-purpose computing wherever your life takes you. From the jaw-dropping performance of the 8th Generation Intel® Core™ i7-8700K processor with six cores to the practical capabilities of the 8th Generation Intel® Core™ i3-8100 processor, our latest generation of desktop processors fits a wide range of budgets and needs. Whether you’re a performance-hungry professional, an exceptional enthusiast, or a first-time buyer, there is an 8th Generation Intel® Core™ processor that will enable the experiences you seek. If form factor is your priority, the 8th Generation Intel® Core™ processor family offers a range of processors designed for desktop PCs from high- performance gaming towers, to slick, and stylish all-in-ones, to compact living room minis.

Prepare to be Amazed with the 8th Generation Intel® Core™ Desktop Processor Family
The 8th Generation Intel® Core™ processors are raising the bar of desktop computing with innovations to drive exciting experiences, capabilities, and form factors. Experience all the amazing things you and a new 8th Generation Intel® Core™ processor-powered PC can do. 



Intel® Core™ i5-8400 Processor Key Features

Intel® Turbo Boost Technology 2.0:  Dynamically increases the processor frequency up to 4.0GHz when applications demand more performance.  Speed when you need it, energy efficiency when you don’t.

Intel® Smart Cache:  9MB of shared cached allows faster access to your data by enabling dynamic and efficient allocation of the cache to match the needs of each core significantly reducing latency to frequently used data and improving performance.

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Integrated Memory Controller:  Supports 2 channels of DDR4-2666 memory with 2 DIMMs per channel.

PCI Express* 3.0 Interface:  Supports up to 8 GT/s for fast access to peripheral devices and networking with up to 16 lanes configurable as 1×16, 2×8, or 1×8 and 2×4 depending on the motherboard design.

Chipset/Motherboard Compatibility:  Compatible with all Intel® 300 Series chipsets with the latest BIOS and drivers.

Intel® UHD Graphics 630:  Integrated 3D performance with support for Microsoft DirectX* 12 and Ultra HD 4K resolution display for immersive mainstream gaming.  For Microsoft DirectX* 12 testing, the performance-tuned Intel graphics driver is expected to be available for download on Intel Download Center by the 8th generation Intel® Core™ processor family product introduction.  The Intel® UHD Graphics 630 dynamic graphics frequency ranges up to 1105MHz.

Vibrant Media:  Enhanced, built-in visual features deliver a seamless visual PC experience for rich Ultra HD 4K entertainment and HD gaming.

Intel® Quick Sync Video Technology:  Media processing for incredibly fast conversion of video files for portable media players or online sharing including support for HEVC 10-bit (H.265) encode/decode to playback premium 4K Ultra HD content from selected service providers.



·         Product Collection – 8th Generation Intel® Core™ i5 Processors

·         Code Name – Products formerly Coffee Lake

·         Vertical Segment – Desktop

·         Processor Number – i5-8400

·         Status – Launched

·         Launch Date – Q4’17

·         Lithography – 14 nm

·         Recommended Customer Price – N/A


·         # of Cores – 6

·         # of Threads – 6

·         Processor Base Frequency – 2.80 GHz

·         Max Turbo Frequency – 4.00 GHz

·         Cache – 9 MB

·         Bus Speed – 8 GT/s DMI3

·         TDP – 65 W

Supplemental Information

·         Embedded Options Available – No

·         Conflict Free – Yes

Memory Specifications

·         Max Memory Size (dependent on memory type) – 64 GB

·         Memory Types – DDR4-2666

·         Max # of Memory Channels – 2

·         ECC Memory Supported – No

Graphics Specifications

·         Processor Graphics – Intel® UHD Graphics 630

·         Graphics Base Frequency – 350 MHz

·         Graphics Max Dynamic Frequency – 1.05 GHz

·         Graphics Video Max Memory – 64 GB

·         Execution Units – 23

·         4K Support – Yes, at 60Hz

·         Max Resolution (HDMI 1.4) – 4096×2304@24Hz

·         Max Resolution (DP) – 4096×2304@60Hz

·         Max Resolution (eDP – Integrated Flat Panel) – 4096×2304@60Hz

·         DirectX* Support – 12

·         OpenGL* Support – 4.5

·         Intel® Quick Sync Video – Yes

·         Intel® InTru™ 3D Technology – Yes

·         Intel® Clear Video HD Technology – Yes

·         Intel® Clear Video Technology – Yes

·         # of Displays Supported – 3

·         Device ID – 0x3E92

Expansion Options

·         Scalability – 1S Only

·         PCI Express Revision3.0

·         PCI Express Configurations – Up to 1×16 or 2×8 or 1×8+2×4

·         Max # of PCI Express Lanes -16

Package Specifications

·         Max CPU Configuration – 1

·         Thermal Solution Specification – PCG 2015C (65W)

·         TJUNCTION – 100°C

·         Package Size – 37.5mm x 37.5mm

·         Low Halogen Options Available – See MDDS

Advanced Technologies

·         Intel® Optane™ Memory Supported – Yes

·         Intel® Turbo Boost Technology – 2.0

·         Intel® vPro™ Technology – No

·         Intel® Hyper-Threading Technology – No

·         Intel® Virtualization Technology (VT-x) – Yes

·         Intel® Virtualization Technology for Directed I/O (VT-d) – Yes

·         Intel® VT-x with Extended Page Tables (EPT) – Yes

·         Intel® TSX-NI – No

·         Intel® 64 – Yes

·         Instruction Set – 64-bit

·         Instruction Set Extensions – SSE4.1/4.2, AVX2

·         Idle States – Yes

·         Enhanced Intel SpeedStep® Technology – Yes

·         Thermal Monitoring Technologies – Yes

·         Intel® Identity Protection Technology – Yes

·         Intel® Stable Image Platform Program (SIPP) – No

Security & Reliability

·         Intel® AES New Instructions – Yes

·         Secure Key – Yes

·         Intel® Software Guard Extensions (Intel® SGX) – Yes

·         Intel® Memory Protection Extensions (Intel® MPX) – Yes

·         Intel® OS Guard – Yes

·         Intel® Trusted Execution Technology – No

·         Execute Disable Bit  – Yes

·         Intel® Boot Guard – Yes

Unboxing & A Closer Look


As with all pre-release samples, out Intel Core i7-8700K comes in a non-descript black box. The only markings are a static sensitive device warning.

The rear of the box is not much different.

Opening it up, we are greeted with our CPU nestled between to ESD safe sheets of foam.

Our CPU bares only the engineering sample markings but does have the retail clock speed laser engraved.

The rear of the LGA 1151 chip isn’t much changed from previous generations.

Our Intel Core i5-8400 next to our Core i7-8700K. 

System Configuration & Performance Testing

CPU: Intel Core i5-8400

Ram: 32GB GeIL EVO Spear, 2x16GB 3200Mhz C14

GPU: Galax HOF GTX 1070

Mobo: Gigabyte Aorus Ultra Gaming

SSD: Sandisk Ultra Plus 256GB

Cooling: Custom 240mm loop, EK Supremacy Evo CPU block, EKWB PE 240mm radiator, Monsoon MMRS res and EKWB D5 Pump. Cooled by two Corsair ML120 Pro fans.


Performance Testing

General Performance Testing

All performance testing was done with the i5-8400 and GTX 1070 at default clock speed. CPU was left with Speed Step and Turbo Boost enabled. Games where ran at a resolution of 1920 x 1080 and higher settings enabled as noted.

PCMark 8

“Use the PCMark 8 Storage benchmark to test the performance of SSDs, HDDs and hybrid drives with traces recorded from Adobe Creative Suite, Microsoft Office and a selection of popular games. You can test the system drive or any other recognized storage device, including local external drives. Unlike synthetic storage tests, the PCMark 8 Storage benchmark highlights real-world performance differences between storage devices.”

PCMark 8 shows the i5-8400 is a solid performer across the board in everyday tasks, only taking 2nd place to its i7 counterpart.

PCMark 10

PCMark 10 is the complete benchmark for the modern office. It is the ideal test for organizations that are evaluating PCs for a workforce with a range of performance needs. The tests in this benchmark cover a wide range of activities from everyday productivity tasks to demanding work with digital media content. PCMark 10 uses a modular approach to build relevant benchmark tests around common end-user scenarios. A Test Group is a collection of workloads that share a common theme or purpose. There are four test groups in PCMark 10, we use three of them.

Essentials: covers the common, everyday ways that people use a PC. The workloads include Web Browsing, Video Conferencing, and App Start-up time.

 Productivity: measures system performance with everyday office applications. This test group includes the Spreadsheets and Writing workloads.

Digital Content Creation: This test group’s workload reflects the demands of working with digital content and media. The tests include Photo Editing, Video Editing, and Rendering and Visualization.

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PCMark 10 shows similar ranking, this time coming in just a few points shy of overtaking the 8-core HEDT CPU.

WebXPRT 2015

WebXPRT 2013 uses scenarios created to mirror the tasks you do every day to compare the performance of almost any Web-enabled device. It contains four HTML5- and JavaScript-based workloads: Photo Effects, Face Detect, Stocks Dashboard, and Offline Notes.  WebXPRT is run with the latest stable release version of Google Chrome browser, in this case, Version 61.

Intel’s Coffee Lake-S CPU’s show exceptional performance in browser-based testing. WebXPRT gives a score with a +/- rating, our 8700K gave a score of 664 +/- 10 but slightly lost out to the i5-8400 with a 674 +/- 10. While within a margin of error of each other, both 8th generation chips show very strong performance in this test suite.

CPU Performance Testing

Super PI Modded 1.5

“In August 1995, the calculation of pi up to 4,294,960,000 decimal digits was succeeded by using a supercomputer at the University of Tokyo. The program was written by D.Takahashi in collaboration with Dr.Y.Kanada at the computer center. This record should be the current world record. (Details are shown in the windows help.) This record-breaking program was ported to personal computer environments such as Windows NT and Windows 95. In order to calculate 33.55 million digits, it takes within 3 days with a Pentium 90 MHz, 40 MB main memory and 340 MB available storage.”

Our i5-8400 comes in at the bottom of this test.  As this is a single threaded benchmark, all of the extra cores don’t help, and the comparatively lower clock speed bring our i5 in more than a minute slower than the 8700K.

SiSoft Sandra – Cryptographic Bandwidth

“SiSoftware Sandra provides a robust package of diagnostic tools for testing your system and teasing out its problems–or potential headaches.”

We see very strong performance again from the new Coffee Lake-S Core i5-8400. Nearly matching last generation’s i7-5820K with twice the thread count is something though. It’s still well ahead of the i7’s of the last few generations though.


“CINEBENCH is a real-world cross platform test suite that evaluates your computer’s performance capabilities. CINEBENCH is based on MAXON’s award-winning animation software CINEMA 4D, which is used extensively by studios and production houses worldwide for 3D content creation. MAXON software has been used in blockbuster movies such as Iron Man 3, Oblivion, Life of Pi or Prometheus and much more.

CINEBENCH is the perfect tool to compare CPU and graphics performance across various systems and platforms (Windows and OS X). And best of all: It’s completely free.”

Cinebench is one test that scales well with both clock speed and thread count. Our slower clocked 6 thread CPU falls behind 7th generation 8 threaded CPU’s by only a small bit but does maintain a lead over 6th generation and older chips.


The benchmark shows a rating in MIPS (million instructions per second). The rating value is calculated from the measured speed, and it is normalized with results of Intel Core 2 CPU with multi-threading option switched off. So if you have modern CPU from Intel or AMD, rating values in single-thread mode must be close to real CPU frequency. There are two tests, compression with LZMA method and decompression with LZMA method. Once the total passes reaches 100, the score is taken

We repeatedly see strong performance from out Coffee Lake-S offerings, but again the lower thread count and clock speed see’s the i5-8400 trail just behind most of our i7 offerings.

Black Hole 4.2

Let the beast run and benchmark your system in three different tests (Multithreaded, Single-threaded & 4-Threaded) that will test your CPU to the very limit, and score you among hundreds of other systems that have tested.

Multithreaded will test your CPU’s efficiency of running more than one thread without major system lag. The higher you score on this one, the more threads your CPU can handle with a comfortable speed. High multithreaded scores generally mean you can render things faster.

4-Threaded tests your CPU’s performance in games since most games currently run on 4 threads.

Single-threaded evaluates how fast the CPU can handle a single, dedicated thread for processing.

The total benchmark score is the sum of all three individual scores. Strong single-threaded performance is shown on the 8700K, but also multi-threaded scores with 12 active threads.

Memory Performance Testing

AIDA64 Engineer Edition

“FinalWire Ltd. today announced the immediate availability of AIDA64 Extreme Edition 1.50 software, a streamlined diagnostic and benchmarking tool for home users; and the immediate availability of AIDA64 Business Edition 1.50 software, an essential network management solution for small and medium scale enterprises. The new AIDA64 update implements AVX-optimized benchmarks for the upcoming Intel Sandy Bridge processors, adds a brand new video encoding benchmark, and supports the latest AMD and NVIDIA graphics processors.”

AIDA64 shows both Coffee Lake CPU’s in our lineup leading the pack of dual-channel CPU’s. The i7-8700K takes first with nearly 50GB/s writes and around 44GB/s on copy and read tests and the i5-8400 only about 3GB/s behind it in copy and write functions.

On the Latency side of things, the i5-8400 still fights its way to the previously i7 only area of the charts with a snappy 58.8 nanoseconds.

Looking internal to the CPU itself, we see Level One Cache Bandwidth speeds more in line with many HEDT CPU’s than mainstream.

Level 2 cache bandwidth shows the i5-8400 placing above even some HEDT i7 CPU’s for copy and write functions.

And finally, level 3 bandwidth is again quite a bit improved over the last few generations, placing in the middle of the previous i7 pack and leaving all of the other i5 CPUs in the dust.

Passmark Performance Test – Memory Mark – Threaded

“Fast, easy to use, PC speed testing and benchmarking. PassMark PerformanceTest ™ allows you to objectively benchmark a PC using a variety of different speed tests and compare the results to other computers.”

Passmark Memory Mark shows the 2nd best score yet, outpacing even quad-channel equipped HEDT CPU’s from the last generation, and significantly faster than other dual-channel CPUs with the exception of its own 8th generation i7 sibling.

SiSoft Sandra – Memory Bandwidth.

“SiSoftware Sandra provides a robust package of diagnostic tools for testing your system and teasing out its problems–or potential headaches.”

We’re starting to notice a pattern here. The i5-8400 takes 2nd place on Dual Channel memory performance and is chopping at the heels of a few of our quad-channel enabled CPU’s. The i7-8700K just barely holds the lead as expected.

Game Testing

3DMark – Fire Strike

“Fire Strike is a showcase DirectX 11 benchmark designed for today’s high-performance gaming PCs. It is our most ambitious and technical benchmark ever, featuring real-time graphics rendered with detail and complexity far beyond what is found in other benchmarks and games today”

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The 8400 opens up our game testing benchmark section with one great Firestrike score. While it only packs 6 threads, it nearly matches the 12 threaded six-core CPU’s of the last generation and gets very close to the 8 threads of the high clock speed quad core CPU’s, the 6700K and 7740X.

3DMark – Time Spy

“3Dmark Time Spy is a new DirectX 12 benchmark test for Windows 10 gaming PCs. Time Spay is one of the first DirectX 12 apps to be built “the right way” from the ground up to fully realize the performance gains that the new API offers. With DirectX 12 engine, which supports new API features like asynchronous compute, explicit multi-adapter, and multi-threading, Time Spy is the ideal test for benchmarking the latest graphics cards.”

We see strong performance in 3DMark Timespy as well. While it may look at first glance like it’s near the bottom of the pack, keep in mind most of the results here are HEDT CPU’s.

Unigine Superposition

Extreme performance and stability test for PC hardware: video card, power supply, cooling system. Check your rig in stock and overclocking modes with a real-life load! Also includes interactive experience in a beautiful, detailed environment.

As this benchmark is strictly GPU oriented, we are more checking for bottlenecks or other issues rather than CPU performance. Keeping the GPU load fairly low, we put the most stress on the CPU we can feeding frames at a very high rate. The i5-8400 does admirably and doesn’t miss a beat.

Grand Theft Auto: V

“When a young street hustler, a retired bank robber, and a terrifying psychopath find themselves entangled with some of the most frightening and deranged elements of the criminal underworld, the U.S. government and the entertainment industry, they must pull off a series of dangerous heists to survive in a ruthless city in which they can trust nobody, least of all each other.”

Rockstar’s Grand Theft Auto: V has long been known to show noticeable gains from stronger CPU’s  and the 8400 trails only its i7 sibling on the scoreboard here in top performance. Even the monster HEDT class 16 core i7-7960X just can’t quite keep pace with these CPUs in gaming.

Metro: Last Light

“It Is the Year 2034. Beneath the ruins of post-apocalyptic Moscow, in the tunnels of the Metro, the remnants of mankind are besieged by deadly threats from outside – and within. Mutants stalk the catacombs beneath the desolate surface, and hunt amidst the poisoned skies above.”

Developed by 4A Games and published by Deepsilver, Metro: Last Light uses the 4A game engine. At its highest settings, the 4A game engine is capable of bringing all but the most extreme gaming systems to their knees.

Intel Claims the 8th gen CPU’s are the fastest gaming processors ever, and it shows. Even on a game that is not CPU bound, it’s near the top of the pack, actually edging out the i7-8700K by a fraction of an FPS.

Tomb Raider

Tomb Raider explores the intense and gritty origin story of Lara Croft and her ascent from a young woman to a hardened survivor. Armed only with raw instincts and the ability to push beyond the limits of human endurance, Lara must fight to unravel the dark history of a forgotten island to escape its relentless hold.

Tomb Raider, released in 2013 really doesn’t tax modern CPU’s as heavily, so we only have a 7 FPS spread in our chart now. At least we don’t see any bottlenecks and we do get solid performance, very close to the i7-8700K.

iGPU Testing

With the release of Coffee Lake-S, Intel updates it’s long-running HD series graphics solution to Ultra HD on the UHD 630 Graphics Technology. The changes from the last generation are minimal and really only extend to the name.

As you can maybe see, you still won’t be playing demanding 3D games with the integrated GPU. Lighter weight games, like several popular E-sports games, should play fine on lower settings though.

Tasks like video editing, streaming video and video chat, as well as photo editing can be performed with the integrated GPU just fine with great results.

Power Consumption & Overclocking

Like its i7 counterpart, the I5-8400 sips a modest 45W from the wall at idle, and only rises to 133 watts under full load. 


As this chip is locked, the multiplier can’t be adjusted. Z370 series chipsets do support adjusting the base clock generator, and we were able to add 2.5% to our CPU by adjusting bClck from 100 MHz to 102.5 Mhz. It’s not much, but it did take our stock Cinebench score from 944 to 973.
Power usage was pretty efficient, sipping only about 150 watts from the wall at overclocked full load, and as you can see from Core Temp above, we hit a peak temp of 47C. Watercooling is pretty overkill for this CPU, and the included thermal solution (Intel’s name for a heatsink/fan assembly) would be plenty for this CPU.

Final Thoughts & Conclusion

This CPU was a bit interesting to test due to its performance level. When compared with mainstream CPU’s of the last few generations, it just mopped the floor with all of them. With many of our benchmarks placing this CPU in line with High-End Desktop CPU’s as far as scores were concerned, it often appears when looking at the charts that this CPU is near the bottom. That is quite obviously not the case, but we decided to compare this CPU more to our high-end charts where it actually placed, rather than out mainstream charts where it should belong.

Some users may be a little miffed by the lack of backward compatibility with motherboards, but the changes Intel made were purposeful and seemed to work quite well. We tested several z370 motherboards, and the VRM’s never even got warm, even while overclocked. The improved memory layouts also made for some greatly increased performance across the board. You won’t be able to use 8th generation CPU’s in your existing 100 and 200 series boards, but you wouldn’t want to anyway.

Overall, If you are looking at building a new affordable gaming machine, you might consider the unlocked i5-8600K for the extra clock speeds but if overclocking isn’t your thing, or you just need a high-performance workstation for productivity reasons, the i5-8400 would be a great choice.  50% more cores and significant performance gains for only a very small increase in price makes this a tough choice to beat and gets our recommendation.  Great job Intel!


ProClockers was founded way back in 2004, with a goal to provide unbiased PC hardware and tech reviews. Whilst the first products we reviewed are long gone, we're continuing to review the latest and greatest every month.

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ProClockers was founded in 2004, and since then we have reviewed thousands of tech products, including motherboards, CPUs, graphics cards, PC cases, cooling solutions and more. Whilst many of the original products we reviewed back then have long bit the dust, we continue working hard to provide unbiased PC hardware and tech reviews.

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