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Silverstone > 
Item#: N82E16817256007

SILVERSTONE ST85ZF 850W ATX 12V 2.2 & EPS12V SLI Certified CrossFire Ready Active PFC SLI Certified Power Supply

  • ATX 12V 2.2 & EPS12V
  • 100 - 240 V 47 - 63 Hz
  • +3.3V@28A,+5V@30A,+12V1@18A,+12V2@18A,+12V3@18A,+12V4@18A,-12V@0.5A,+5VSB@3.0A
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The Silverstone ST85ZF power supply packs prime power and efficiency (around 80%!) in a compact unit. This PSU cranks up to 850 Watts of continuous power. It features a 24-pin motherboard connector, an 8-pin ATX12V connector, an 8-pin to 4-pin ATX12V adapter connector, a 6-pin AUX connector, four 6-pin PCI-E connectors, six SATA power connectors, six 4-pin IDE power connectors, and two 4-pin floppy power connectors, to wire up almost anything you can imagine.

Industrial class components deliver top-of-the-line performance. It features an 80 mm ball bearing fan, for quiet cooling. The Silverstone ST85ZF is capable of supporting ATX 12V 2.2 and EPS12V. The Quad +12V rail ensures superior performance, with independent and reliable power to both your CPU and video cards.

A 24-Pin main connector, and SLI support round out the mix. The over voltage protection feature provides protection from electrical surges. This power supply from Silverstone has an MTBF of 100,000 hours. Plug it in and run it as hard as you like! It'll keep putting out all the power you need!

  • newegg ATX12V v2.2 and EPS12V Compatible Compatible with the ATX12V v2.2 and EPS12V standards, the SILVERSTONE ST85ZF provides maximum power stability to drive the latest Intel and AMD processors as well as other components for desktop and entry-level server computer systems.
  • newegg 850W Maximum Power A maximum power of 850W delivers safe, reliable output for ultra high-end computer systems.
  • newegg Highly Efficient Delivering up to 80% efficiency, the SILVERSTONE ST85ZF saves energy and may even reduce your electric bill!
  • newegg Intelligent Black Cable Sleeving This power supply's cables are wrapped in black sleevings to optimize air flow and improve cooling in the case.
  • newegg NVIDIA SLI Certified The SILVERSTONE ST85ZF has gone through a series of rigorous NVIDIA SLI certification tests for maximum system stability when building NVIDIA SLI PCs.

Learn more about the Silverstone ST85ZF




ATX 12V 2.2 & EPS12V
Maximum Power
80mm ball bearing fan
Main Connector
+12V Rails
PCI-Express Connector
4 x 6-Pin
SLI Certified
CrossFire Ready
> 80%
Over Voltage Protection
Input Voltage
100 - 240 V
Input Frequency Range
47 - 63 Hz
Input Current
14A @ 115V, 7A @ 230V
>100,000 Hours


1 x Main connector (24Pin)
1 x 12V(P4)
1 x 12V(8Pin)
6 x Peripheral
6 x SATA
2 x Floppy
4 x PCI-E
lead-free paint (RoHS)
Noise Level: 24 dBA minimum
Operating temperature: 0 ~508C
+3.3V & 5V: 180W Max.
Combined + 12V: 70A/840W
Class-leading continuouns 70A Quad + 12V combined output @ 50 *C

Manufacturer Warranty

3 years limited
3 years limited

Quick Info


  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years

Customer Reviews of the Silverstone ST85ZF

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  • Joe C.
  • 11/15/2008 3:03:29 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsWork Horse

Pros: I have lots of watt hungry accessories and the power supply handles it with ease. Nice cables, etc.

Cons: I can't think of any.

Did you find this review helpful? Yes No

  • Karthik V.
  • 8/26/2008 7:25:15 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsAmazing PSU

Pros: Only one thing to say about this PSU.. its AWESOME!!. Amazing performance and safety measures from this PSU. Have been using this PSU for abt 8months now and im glad I made this purchase :). Recently about 6 months ago, my comp wasnt booting and I was worried abt what the prob was.. the cpu used to fire up and then die again.. I tot it was a prob with the psu, but in the end it turned out that my old SLB cabby had one of the front usb ports touching the metallic part and hence creating a short. The PSU has been built to handle it in such a way that if there is a short being created then it doesnt power up the rig so as to protect the components. This one feature saved my entire rig. There are many more features and reviews too that suggests that this is one hell of a purchase :D.


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  • Chris G.
  • 6/21/2008 10:29:40 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsOne of my best PSU purchases ever.

Pros: I've been using this PSU for over a year and I have absolutely no complaints. It was $289.99 when I purchased it. I had 2 raptors, 5 7.2k drives, 2 dvd-rw drives, a floppy, a 7800 gtx, a tornado fan and about 5 other case fans when I purchased this. The voltages were as rock solid then as they are now. The PSU hasn't hiccuped or skipped a beat. I think I might be a silverstone fan for life.

Cons: Absolutely none

Other Thoughts: I see that some people had their PSU arrive DOA or close to it. Don't let that be a deterrent. Shipping can do numbers to ANY product regardless of the quality of the product or packaging. Mine happened to arrive fine. As long as you get one that works you will not be disappointed.

1 out of 1 people found this review helpful. Did you? Yes No

  • Jessica M.
  • 6/4/2008 4:11:43 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsTough and Reliable

Pros: Great product. Not a single compliant. Handles everything I throw at it.

Cons: None.

Other Thoughts: It's abit larger than your regular PS. So be prepared that some cases and mods will have to be adjusted to fit this PS.

1 out of 1 people found this review helpful. Did you? Yes No

  • Anonymous
  • 5/6/2008 7:03:45 PM
  • Tech Level: Somewhat High
  • Ownership: less than 1 day
  • Verified Owner

1 out of 5 eggsDOA

Pros: Newegg has the best customer service ever! I only wish the products they have were as good.

Cons: Turned on my brand new built pc, started installing the OS and P.S. dies. It might have gotten damaged in the shipping process but I should have gone with a better brand anyway. DON'T WASTE YOUR TIME WITH THIS! Spend the extra dough to get a really good power supply.

P.S. - Try to go modular, it just makes the process easier.

Other Thoughts: Newegg was fantastic with handling my claim.
EVGA 780i, Q9300 Yorkfield, Corsair 2x2gb mem, Palit GeForce 9600GT SONIC 1GB, 320gb hd, Windows Vista x64.

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  • Glenda S.
  • 5/2/2008 11:00:04 AM
  • Tech Level: High
  • Ownership: less than 1 day
  • Verified Owner

1 out of 5 eggsZeus ST85ZF

Pros: Greetings. Long time customer here. Silverstone is a great brand when it comes to PSU's and cases. The Zeus line of PSU's will truly handle most things in a stable manner.

Cons: Mine arrived DOA. Not only this, after connecting unit to test, all the LED's on my motherboard lit up properly, the PSU itsef has an indicator LED as well. As soon as I hit the switch the PSU produced a loud pop and rendered my entire system inoperable. Now, keep in mind the predicament, Newegg do not hold themselves responsible for such damages, in my situation I am still trying to figure out what fried. They did however, ship me an item that cost me dearly, and if these are risks from products they sell I'm not too keen on purchasing items from here anymore, even after years of doing so.

Other Thoughts: Bad experience with this particular model, if the unit looks like its been previously opened, ship back immediately.

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  • David P.
  • 10/22/2007 1:53:29 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

2 out of 5 eggsAlmost 1 year

Pros: 850 watts of power, lots power connections

Cons: I purchased this power supply on 1 Dec 2006 and it has finally gave up. It took out my Exos2 controller board before I figured out the problem

Other Thoughts: I am a power user and the pc ran 24/7. I believe the power supply died early due to its 80MM fan.

1 out of 1 people found this review helpful. Did you? Yes No

  • David S.
  • 8/14/2007 11:00:23 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsProblem resolved

Pros: Repaired the unit, works perfectly now. Running it 24/7 on an in-shop computer with no problems.

Cons: damper diode was installed backwards at factory, caused dead short on high voltage, not lightning as first suspected.

Other Thoughts: Silverstone offered to replace the p/s direct, but it works good now, so I'll keep it. E-mail must have gotten lost to mfr us office. I would buy again for resale or my own use.

1 out of 1 people found this review helpful. Did you? Yes No

  • David S.
  • 8/8/2007 3:43:05 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

1 out of 5 eggs3rd review

Pros: Cheap

Cons: First ps doa... Fixed it myself. Diode soldered in backwards, dead short. Silverstone has not responded to my email for technical assist.

Other Thoughts: Don't waste your money... QC of this level? Spend your money somewhere else. Mfr defects are a criminal offense... Silverstone is on my 'hit list'. I DID buy a LOT of FM121 fans, but this p/s?

A response from the US OFFICE, with my requested techie info would have been great. They've ignored me for a week now.

Manufacturer Response:

Thank you very much for using SilverStone. There is a chance your e-mail was lost or rejected so please try calling our US office directly at (909) 598-2318.

1 out of 1 people found this review helpful. Did you? Yes No

  • David S.
  • 7/30/2007 2:03:46 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggs2nd review, first doa

Pros: Cheap power supply. cables plenty long and enuf for current applications.

Cons: DOA... no smoke, nothing... totally dead.

Other Thoughts: I'm an electronic techie, so fixed it myself for less than the rma return costs... Factory had soldered a damper diode backwards, creating a dead-short. Blew the diode, and also 2 mosfet transistors. Diode, 10-cents, 2 mosfets, $8. My time? Priceless!!! But, I put a PC-P&C 750 copper in the system. It works...

Did you find this review helpful? Yes No

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Item#: N82E16817256007
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