SILVERSTONE ST1500-GS 1500W 80 Plus Gold PSU Review: Page 4 of 7

Posted by Mark Taliaferro on Wednesday, October 18, 2017 - 8:00am

Features & Specifications

80 Plus Standard

Let's cover the 80 Plus standard so we know what the different standards are. The 80 Plus certification is a voluntary certification program intended to promote efficient energy use in computer power supply units (PSUs). Launched in 2004 by Ecos Consulting, it certifies products that have more than 80% energy efficiency at 20%, 50% and 100% of rated load, and a power factor of 0.9 or greater at 100% load. These PSUs waste 20% or less electric energy as heat at the specified load levels, reducing electricity use and bills compared to less efficient PSUs. Here's a graphic to show the standards at which power supplies are held to make the different grades of 80 Plus Certification.

The two things to remember here are:

  1. That the higher the rating the more power efficient the PSU will be so 80+ means 80% of the power input is converted to the usable power delivered to the PC. 
  2. The undelivered portion of power (the other 20%) is delivered by heat generated.

The Law of Conservation of Energy simply states: 

The total amount of energy remains constant in an isolated system. It implies that energy can neither be created nor destroyed, but can be changed from one form to another. So in the case of computer power supplies an 80 Plus power supply if we feed in 100v it delivers 80v to the PC and 20v to waste heat.

80 Plus Certification Standards

80 Plus test type 115V internal non-redundant 230V internal redundant
Percentage of rated load 10% 20% 50% 100% 10% 20% 50% 100%
80 Plus   80% 80% 80%        
80 Plus Bronze   82% 85% 82%   81% 85% 81%
80 Plus Silver   85% 88% 85%   85% 89% 85%
80 Plus Gold   87% 90% 87%   88% 92% 88%
80 Plus Platinum   90% 92% 89%   90% 94% 91%
80 Plus Titanium 90% 92% 94% 90% 90% 94% 96% 91%

The conundrum of power supply building is that as a power supplies efficiency increases so do manufacturing costs. So while an 80 Plus Silver 1500w might cost $300, and 80+ Gold might run $337 and a Titanium $399. So you really need to look at Price vs Efficiency and know how much energy you are pulling from the wall. If you are running a high-end Vega X-Fire setup overclocked with a 16 core CPU efficiency matters. Even running an 80 Plus Silver over a Bronze can save you 5% of total power costs. This becomes essential in server costs and mining machines.

Silverstone ST1500-GS PSU Specifications

Model No.
Max. DC Output
1500W (Peak 1600W)
Power density
646W per liter
Load Range
  +3.3V +5V +12V1 +12V2 +5VSB -12V
25A 25A 70A 70A 3.5A 0.3A
Peak (Amps)
/ / / / / /
0.2A 0.2A 0.2A 0.2A 0A 0A
Range (%)
±3% ±3% ±3% ±3% ±5% ±10%
Line Reg.(%)
±1% ±1% ±1% ±1% ±1% ±2%
50mV 50mV 120mV 120mV 50mV 120mV
Black (scratch resistant and lead-free paint)
combined +3.3, +5V
combined +12V
Input Voltage
Input Frequency Range
47Hz ~ 63Hz
Active PFC(PF>0.95 at Full Load)
87% ~90%(at 20%~100% loading)
100,000 hours
Operating temperature
0°C ~ 40°C
Over current protection
Over power protection
Over voltage protection
Over Temperature Protection
Under voltage protection
Short circuit protection
No load operation
1 x 24 / 20-Pin motherboard connector(550mm)
1 x 8 / 4-Pin EPS / ATX 12V connector(750mm)
1 x 8 / 4-Pin EPS / ATX 12V connector(550mm)
8 x 8 / 6-Pin PCIe connector("550mm / 150mm" x4)
16 x SATA connector(”600mm / 150mm / 150mm / 150mm” x4)
6 x 4-Pin Peripheral connector (”600mm / 150mm / 150mm” x 2)
2 x 4-Pin Floppy connector(”600mm / 150mm / 150mm / 150mm” x 2)
Cooling System
Silent 135mm fan
Noise Level
150 mm (W) × 86 mm (H) × 180 mm (D)
Form factor
80 PLUS Gold

Power Density by Volume is a concept that came about a few years back and what it means is how much power is delivered by each liter of volume of the PSU. So take the total liters that would fit into a PSU and the total wattage then divide the total wattage by the volume of the PSU yielding a measurable "per liter Wattage". The Silverstone ST 1500-GS is the smallest 1500w 80 Plus Gold on the market and delivers 636w per liter of volume. Just as 80 plus specifications cost more as they deliver better efficiency the size of a power supply gets higher as the size is reduced but this mainly effects watt monster PSU. Get up around 1000w and some PSU are ginormous, SilverStone recognized this problem and started actively seeking to reduce power supply size with the crowning jewel the SilverStone St1500-GS we are looking at today.

Our fan runs 135mm at a whisper quiet 18dBA to 34dBA in a 150mm(w) x 86mm(h) x 180mm Deep which makes for a pretty small efficient quiet PSU. We aren't;t running a single 12v Rail here but rather 2-12v Rails with both pushing a max of 70A per rail for a combined total of 140A. At 1440W the on the 12V Rails the PSU should be running 120A so Silverstone designed in a 20A safety buffer for the rest of the lines to use. The watt monster is capable of pulling 90-264v from the wall and operates on a normal 110v (USA) wall socket. You might note that peak output is 1600W but the rating is 1500W which should be enough to run any setup you can get in a normal chassis with the exception of some insane 6 GPU mining rig using huge video cards.


Cabling - Silverstone ST1500-GS
Type of Cable Length from PSU 12V Rail
Modular Cables
20+4 pin ATX connector 540mm 12V1
4+4 pin EPS/ATX12V 560mm
4+4 pin EPS/ATX12V 750mm
5.25"+5.25"+5.25"+5.25" (Molex) 610+150+150+150mm
5.25"+5.25"+5.25"+3.5" Molex + Berg 610+150+150+150mm
SATA+SATA+SATA+SATA 600+140+140+140mm
SATA+SATA+SATA+SATA 600+140+140+140mm
SATA+SATA+SATA+SATA 600+140+140+140mm
SATA+SATA+SATA+SATA 600+140+140+140mm
6+2 pin PCIe, 6+2 pin PCIe 560+150mm
6+2 pin PCIe, 6+2 pin PCIe 560+150mm 12V2
6+2 pin PCIe, 6+2 pin PCIe 560+150mm
6+2 pin PCIe, 6+2 pin PCIe 560+150mm
(L x W x H)
180mm x 150mm x 86mm



To make the cabling explanation a little easier we designed a multicolor table showing what cables and what runs on which Rail. The standard 20/24 pin ATX (motherboard) connector and 2x 4x4 pin CPU power connectors. Two Molex Cables four connectors each, one with a Berg connector (floppy drive), 4 SATA cables with 4 connectors each and a dual 6 pin PCIe all running off the first 12v1 rail. Then the 12v2 rail is all about the PCIe (video card) connectors and has 3 PCIe cables each with two 6+2 PCIe. That's a whopping total of 28 connectors you can use in whatever configuration you need.


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