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Silverstone > 
Item#: N82E16817256032

SILVERSTONE ST400 400W ATX 12V 2.2 Power Supply

  • ATX 12V 2.2
  • 110 - 120V/ 220 - 240V 50/60 Hz
  • +3.3V@28A,+5V@30A,+12V1@18A,
  • +12V2@18A,-12V@0.5A,+5VSB@2.5A
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Sometimes, you don't need a thoroughbred, you just need a sturdy workhorse. With a rating of 100K hours Meant Time Between Failures (MTBF), this plucky little supply from Silverstone is just such a workhorse.

Possessing an output of 400 Watts at >70% efficiency, this supply is also inexpensive enough that you could buy a couple of extras as emergency spares. Not that you're likely to need them for years. Dual +12Vdc rails for clean and even distribution of power, this ATX-compatible supply has a 120 mm silent fan to keep it cool without roaring like a jet engine. Four SATA connectors and one PCI-E connect support modern equipment as well as older models.

So, if you need a tough little supply at a good price, this could be the one for you. Check it out and decide for yourself; we'll be right here when you need us.

  • newegg ATX12V v2.2 Compatible Compatible with the ATX12V v2.2 standard, the Silverstone ST400 power supply provides maximum power stability to drive the processors as well as other system components.
  • newegg 400W Maximum Power A maximum power of 400W delivers safe, reliable output for average gaming computer systems. Two industry-leading independent +12v rails are provided for more stable and safer power output.
  • newegg 120mm Silent Cooling Fan The Silverstone ST400 features a 120mm ball bearing fan for increased overall airflow and heat dissipation in the power supply enclosure.

Learn more about the Silverstone ST400

Model

Brand
SILVERSTONE
Model
ST400

Spec

Type
ATX 12V 2.2
Maximum Power
400W
Fans
Silent running 120mm fan
Main Connector
20+4Pin
+12V Rails
2
PCI-Express Connector
1 x 6-Pin
SATA Power Connector
4
SLI
No
CrossFire
No
Modular
No
Efficiency
>70% (Max 79.69%)
Over Voltage Protection
Yes
Input Voltage
110 - 120V/ 220 - 240V
Input Frequency Range
50/60 Hz
Input Current
8.5/ 5A
Output
+3.3V@28A,+5V@30A,+12V1@18A,
+12V2@18A,-12V@0.5A,+5VSB@2.5A
MTBF
100,000 hours at 25°C , full load
Approvals
TUV, cUL, FCC

Features

Connectors
1 x 20+4Pin motherboard connector (550mm)
1 x 4Pin ATX12V connector (550mm)
1 x 6Pin PCI-E connector (550mm)
2 x Dual SATA connector (500mm +250mm)
2 x triple 4Pin IDE & single floppy power connectors (500mm + 250mm + 150mm + 150mm)
Features
Dual +12V rails for newest systems
Silent running 120mm fan
Four serial ATA connectors
Support PCI-E 6Pin connector
Strong continuous power output
Support ATX 12V 2.2

Manufacturer Warranty

Parts
1 year limited
Labor
1 year limited

Quick Info

Warranty

  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year


Customer Reviews of the Silverstone ST400

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  • Joost V.
  • 7/8/2013 2:04:21 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

3 out of 5 eggsDied Today

Pros: Great PSU while it lasted.

Provided a stable flow of current and has been placed in many different units.
I used this as my test PSU for quite a lot of builds.

Could power a HD 4850

Cons: Only 70% efficient

Other Thoughts: Arrival Date was: 12/30/2009

This means the unit has been running for 3 years and 6 months.

30k hours when running full time, only 30% of what was promissed. (100k hours)

Did you find this review helpful? Yes No

  • Scott S.
  • 2/15/2010 3:21:42 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGreat PSU

Pros: Very stable, very quiet PSU, and very well built for the price.

Cons: None

Other Thoughts: Bought 2 for the two builds I made for family members over the holidays. Have had no issues with either power supplies.

Did you find this review helpful? Yes No

  • Michael B.
  • 12/10/2009 2:06:49 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsStill Going Strong

Pros: Installed in July 2008, still works great.

Lots of connectors...including plenty for SATA devices. Yes it's only rated at 400 watts but don't let that fool you. This 400 watt power supply will blow the doors off any cheapo 600 watt ps any day.

Ran my overclocked 8800GS flawlessly for well over a year, now running an HD4770. Easily enough power to run a GTS250 (or any G92 based card) without issue.

System Specs: C2D E7200 @ 3.42GHz, 4GB PC8500, XFX HD4770, SATA Optical Drive, 1 SATA HD, 1 IDE HD, 3 case fans.

Cons: None.

Other Thoughts: Someone said there weren't enough long term reviews to judge reliability. Installed one of these in my sons machine in November of 08, that one is fine too. Bought another for my friends machine this summer...again no issues.

This is hands down the best $50 power supply out there. Google it, read some reviews. Received a silver award from HardOCP. The only other alternatives for me in this price range would be the lower priced offerings from Antec.

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  • William H.
  • 12/7/2009 2:21:26 AM
  • Tech Level: Average
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsVery Good

Pros: I have been running this now for 14 months. When I first installed it, it was loud. That is because it was running at full power. That alerted me to the fact I had spyware on my computer that was running. I got rid of the spyware and I never hear the fan now.

Cons: None

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  • michael y.
  • 11/9/2009 1:14:42 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsNice unit

Pros: Ive had this one sitting on a shelf for some time as It was on sale and bought it for a backup. I finally installed it in a new build a couple days ago and its quiet and running great so far. Even though its not a high dollar PS it seems to be of decent quality and am pleased so far with it.

Cons: No cons, long term reliability remains to be seen but have positive impression of the Silverstones quality.

Other Thoughts: NEVER - - EVER -- EVER buy a no-name cheapo power supply, its not worth risking blowing up hundreds of dollars of hardware to save $20.00 - $30.00 or whatever on the power supply. Cheap supplies can be the cause of no end of hard to find glitches, like spontaneous reboots and who knows what else depending on what the deficiency in the PS is -- not to mention just plain frying your parts at any given time. And even with a name brand, dont let the brand fool you into thinking you can load down a $35-$40.00 power supply with too much hardware, always leave a safety margin of about 25% or more draw below the max rating so its not working at full load all the time-- Chances of a failure or glitch are much less likely.

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

  • Anonymous
  • 9/25/2009 7:28:54 AM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsSteadily Performing PSU

Pros: This is a great unit. It started as my main PSU for several months until I replaced it with a different brand that offered more power. After that unit died (died!), I switched back to my Silverstone with no problems whatsoever. I've never had a problem or hiccup with this PSU.

Cons: 400 watts is a little low, so I'd like a higher wattage PSU with the Silverstone label.

Other Thoughts: A good PSU is one that you install and forget about. When this PSU is in, I never worry.

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  • Anonymous
  • 7/24/2009 6:35:44 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsAbsolutely love it!

Pros: Absolutely love it! It has just about every connection you could ever need. Long cables can reach anywhere in the case, lots of SATA connectors, comes with a cable management strap, runs quiet, reliable power, looks nice ...

Cons: Its not hydrogen powered ;)

Other Thoughts: Would buy this power supply again in a heartbeat. Best PS I've ever used.

Did you find this review helpful? Yes No

  • Nick C.
  • 7/19/2009 9:46:34 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsQuiet, low price

Pros: Runs quieter than my cpu cooler, powers my system perfectly, hope to use it for quite some more time. It has been working for about 11 months, at least 15 hours a day. Lives up to its Silverstone name.

Cons: None :)

Other Thoughts: System Specs:
Intel Pentium 4 3.0 Ghz
ECS (ELITEGROUP) 915P-A2
2x 1GB Micron DDR2 667MHZ RAM
EVGA GeForce 9600GT 512GB GDDR3
SILVERSTONE 400W power supply

Did you find this review helpful? Yes No

  • Anonymous
  • 7/14/2009 5:29:54 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsQuiet, lots of SATA power connectors

Pros: Quiet, 4 SATA power connectors, plenty of power for a basic PC

Cons: None

Other Thoughts: I bought this to build a budget PC. My two main requirements were silent operation and at least 3 SATA power connectors. This power supply was one of the lowest price units available (after rebate) and it had good reviews, so I ordered one. I have not been disappointed. It does exactly what I need it to do. My PC was built using components that don't require tons of power, so 400W is great plenty for me.

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  • Sanford L.
  • 7/7/2009 7:10:51 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsDied at 6 Months

Pros: Silverstone is supposed to be a quality manufacturer. The power supply appears to be high quality.

Cons: The supply became flaky at 3 months, and died 3 months later.

Other Thoughts: There are not enough long-term user reveiws to judge how long this power supplies might last. So I've decided to replace this supply with FSP Group's SAGA+ 400R power supply. That one has dozens of long-term user reveiws, most of which are still happy with their purchase. So I hope to have better luck with that power supply.

Manufacturer Response:

Thank you very much for purchasing a SilverStone. Since your power supply is still in warranty, I would suggest you to contact our US office directly for return and exchange. The contact information can be found in the below link:

http://www.silverstonetek.com/contactus.php?area=

Did you find this review helpful? Yes No

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Item#: N82E16817256032
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