Intel Core i7-7820X CPU Review

General Performance & CPU Performance Results

We were rather constrained for time. We have included as many comparison processors as possible. In some cases, there wasn’t enough time to test every possible processor at our disposal, so we included the most pertinent for comparison.

General Performance Results

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.”

The 7820X shows expectedly strong performance, leading the pack and only just behind its 10-core counterpart, the 7900X.

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 environment 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.”

Being dependent on a single thread, Super-Pi favors a fast clock speed. The 7820X is able to boost to 4.3Ghz under a light load, so it does fairly well here.

CPU Performance Results

Fritz Chess

Fritz Chess is a benchmark in which a fictitious game of chess is played. As each move has to be calculated by the computer, it is an excellent test of CPU muscle.

We see strong performance out of the 7820X, only really edged out by chips with a little faster clock speed.


“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 many 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.”

Just under the 7900X is where we would expect this CPU to be, and it does not disappoint.


This form allows you to measure the performance of your computer. 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.

7-Zip reflects the exact same trend on this chart with our cpu only being edged out by its 10 core bigger brother.

Memory Performance Results

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.”

Coupled with 3200Mhz ram, we see very high scores here, hitting more than 85GB/s in read speeds alone from its quad channel memory config.

We see pretty average latency scores here. For Intel, the more complex quad channel architecture tends to turn in a bit more delay than the dual channel chips.

Internal CPU L1 cache bandwidth is about what we would expect; turning in just shy of 2TB/s in read and copy operations.

Again, with the slightly slower Level 2 cache we see the same trend.

Level 3 cache bandwidth testing came up with an anomaly, slamming into a wall at about 100GB/s. We believe this to be a lack of support from the latest revision of AIDA64 that will be corrected shortly, and indeed AIDA64 does warn us after testing that our CPU may not be fully supported. Based on L1 and L2 testing, we would expect to see about 650-700GB/s read/copy and perhaps 500-550GB/s for write operations

Passmark Performance Test 8 – Memory

With the 3200Mhz quad channel memory, we again see a very high score.

SiSoft Sandra

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

And again, the very same trend, turning in north of 61GB/s in all tests.


Written by Alexander J. Lee “From a high-school project that went a little too far…” y-cruncher, (y for gamma) is a number crunching program that can compute various mathematical constants. It was originally a small program specialized for computing the Euler-Mascheroni Constant. (Which uses gamma as its symbol, hence the name). It has since gained the ability to compute other constants. It is the first of its kind that is multi-threaded and scalable to multi-core systems. Ever since its launch in 2009, it has become a common benchmarking and stress-testing application for overclockers and hardware enthusiasts.

We tested using the built in benchmarks to compute Pi to 1 Billion Digits in both single and multi-threaded mode, and recorded the Total Computation time at the end of the run. Y-Cruncher is also able to take advantage of AVX512 instructions in compatible CPU’s. Due to the thermal load of running Intense AVX workloads, Intel has implemented and AVX offset clock that may scale the CPU’s clock speed back, even below stock speeds when running intense AVX loads. For this reason, we note the CPU’s clockspeed in both single and multi-threaded test modes.

With the higher core count it’s hard to tell here from the multi-threaded testing a big difference, of course more cores means a faster calculation time right? What I really need to point out here is the single-threaded score.

The i7-7820X is one of the very first consumer CPU’s to support the AVX512 instruction set, and this is one test that can take advantage of this new feature. The AVX offset on this platform scales the CPU clock speed back pretty heavily when running an AVX load on all cores, but running only one core, we are still able to boost to 4.0Ghz. The i7-5960X runs a full 3.5Ghz all the time no matter the load.

Considering the slight boost in clock speed, the new 7820X still manages a staggering 60% faster calculation time on a single thread over its older counterpart. That is the magic of the AVX512 Instructions, and gives you an insight on how much acceleration this can provide when taken advantage of. It even manages a faster time than its Kaby Lake-X counterpart that runs a faster clock speed on this test, but doesn’t support AVX512.

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