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Item#: N82E16817256063

SILVERSTONE ST45SF 450W SFX12V 80 PLUS BRONZE Certified Active PFC Power Supply

  • SFX12V
  • 80 PLUS BRONZE Certified
  • 90 - 265V 47 - 63 Hz
This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
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SFX Series ST45SF 450W Power Supply


After successfully revolutionizing both HTPC and SFF market segments with innovative chassis designs, SilverStone engineers continue their push for advancement in these categories by releasing a truly upgrade-worthy small form-factor power supply: the ST45SF. This SFX unit is compatible not only with chassis that use SFX power supplies but also in smaller ATX chassis with the included adapter bracket.

Despite its small size, the ST45SF has features that one would expect from an elite ATX power supply - such as 80 PLUS Bronze level of efficiency, temperature controlled fan, 50-degree temperature rating, and reliability for 24/7 operation. Enthusiast-oriented features are also present with single +12V rail and 8-pin / 6-pin PCI-E connectors to fully support multi-GPU systems. For SFF users and for SilverStone, the ST45SF is more than just an upgrade - it is an important milestone for the DIY desktop computer.


Key Features

  • Supports standard SFX form factors and ATX via included bracket
  • 450W continuous power output at 122°F (50°C) operating temperature rated for 24/7 operation
  • 80 PLUS Bronze level efficiency (82 - 85% efficiency at 20 - 100% load)
  • Class-leading single +12V rail with 36A
  • Silent running 80mm fan with 18dBA minimum
  • Single PCI-E 8-pin and dual PCI-E 6-pin connectors support
  • Active PFC



80 PLUS Bronze certified to reduce wasted heat and save on electricity


Built-in 80mm fan has excellent airflow and low noise, perfect for quiet home or office use


Powerful single +12V rail design, perfect for future high-end component upgrade


Included SFX to ATX bracket for use in ATX case



What's in the Box

What's in the Box


Learn more about the Silverstone ST45SF

Quick Info


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

Customer Reviews of the Silverstone ST45SF

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  • Eric M.
  • 3/4/2015 6:55:38 AM
  • Tech Level: High
  • Ownership: more than 1 year

5 out of 5 eggsPerfect size, power, and price!

Pros: Small Form Factor

Cons: none

Other Thoughts: Even with very few options for power supplies this size (SFF), the price is perfect and provides enough power for an HTPC or even a Low-Mid Level Game Rig for your living room. Combined with the Silverstone Milo series Case, it's a perfect match. I did a review on the Silverstone Milo case as well, but have since updated the hardware... This is my setup

Case - ML07B Case
PSU - ST45SF 450W Power Supply
Motherboard - ECS Mini-ITX H61H2-I
Processor - Intel Core i5-2500
Memory - 2x2GB DDR3 1333
HDD - Seagate 7200.12 160GB 2.5"
Optical - Slim slot-load DVD+-RW
Video - NVidia GTX 560 Ti
3 case fans

No problems supplying power even when under full load gaming. Although, in the interest of preserving the life of the power supply, I am replacing the GTX 560 Ti with a GTX 750 Ti... Same performance, but much less power consumption.

Many people might complain that this PSU is "not" modular... My thoughts on that...
First - there is a modular variant, but of course you have to pay extra for "features", so it should not be listed as a "con".
Second - Modular PSU's are good and bad... sure you only need to connect the number of lines that are necessary... but if you need to use most of the connections, it gets just as crowded in your case as bundling the remaining wires from a standard PSU because now you have a thick array of wires coming out of your PSU, instead of a tightly bundled group...
I think Modular PSU's are great... if you actually only use 1-3 power leads... anything beyond that and you've wasted your money, imho... just save some bucks, get a standard PSU of the same rating, and tuck your extra wires away neatly.

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  • Jose C.
  • 2/25/2015 7:11:51 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsWorks as expected

Pros: I purchased this power supply to go in a silverstone sugo and it fit nicely. The fan is super quite. It had adequate connectors for my needs.

Cons: None.

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  • CHENG W.
  • 2/21/2015 10:10:04 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year

2 out of 5 eggsGood little PSU but issues with noise

Pros: Nice and compact. Works well.

Cons: Number of issues with the noise. While the fan is reasonably quiet, it whines at times. There is also some issue in my unit where it sounds like something is bouncing off the fan. It makes this annoying clicking noise.

Other Thoughts: Would be great if Silverstone had better quality control. I have QA issues on an FT03 as well.

I'm told I can ship it back to claim warranty but I can't use a computer without a PSU... They don't offer advanced warranty.

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  • Thomas B.
  • 2/15/2015 8:51:55 AM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsQuiet Power for Small Cases

Pros: The Silverstone ST45SF packs the power needed for a gaming Mini-ITX build while remaining efficient, quiet, and reliable. The fan inside the PSU has always remained whisper quiet even when pushed to it's upper limits.

Silverstone provided long enough power leads to allow for connectivity of components on the other side of a Mini-ITX case. The ST45SF fits perfectly inside of the Silverstone FT03 Mini without having to sacrifice precious space otherwise used for a video card. The 80% plus power efficiency is icing on the cake!

Cons: This isn't a modular power supply. That being said, the modular variation of this power supply caused clearance issues inside of the Silverstone FT03 Mini case. The extra power connections were easy enough to bundle up and neatly tuck out of site.

Other Thoughts: Over the course of a year and a half, I've put this power supply through some serious gaming binges and it has withstood the abuse. It has powered two different generations of Nvidia graphics cards without any problems.

Original Build-
Silverstone Fortress FT03 Mini
Samsung 840 Pro 256 Gb SSD
WD 1TB Hard Drive --> Upgraded to Samsung 840 EVO 1Tb
G.Skill Trident 2x8Gb Ram
Antec Kuhler 620
EVGA 670GTX FTW --> Upgraded to EVGA 970GTX Superclocked

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  • John M.
  • 12/18/2014 5:01:52 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

3 out of 5 eggslasted 4 years

Pros: finally died after 4 years, time to order another since this is the only one of its size made. silent fan.

Cons: few competitors...died after 4 years

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  • Matthew K.
  • 8/27/2014 1:05:55 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsCurrently most powerful SFX PSU

Pros: It is the most powerful PSU that you can get in it's size currently, and if you want to run basically any GPU out there, you are going to need minimum 450w PSU, so if you are building, say, a gaming mini ITX sized computer, this is pretty much your only option if you want everything to actually get optimal power

it is indeed a very finely crafted PSU as I would expect from silverstone sturdy, and nice to look at in case it isn't possible to completely hide

Cons: no cons, it only has few connectors, but at 450w it is the exact right amount

Other Thoughts: The silverstone 600w SFX PSU has actually already been announced, however it is still not ready...

to put things into perspective, Nvidia's recommended minimum wattage for the crazy high-end Titan series graphics cards, just happens to be 600, and that INCLUDES everything else your system will be using

once these things hit the shelves, beastly mini gaming computers will be quite popular I think.

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

  • Robert B.
  • 3/5/2014 8:45:53 AM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsExcellent PSU

Pros: The small size of this unit is especially great for Mini ITX cases, but even for larger cases, if your parts don't require too much power, this is an excellent option.

I am able to run a respectable gaming setup on this PSU consisting of a Radeon 6850, AMD A10-5700, 16 gigs of ram, and an SSD.

Cons: If you are putting together a powerful machine, you'll need to know the power draw of each part, especially the video card.

The PSU is not modular, so it might be tough to manage the extra cables, especially in a small case.

Standard ATX 450 watt PSUs tend to cost less than this SFX model.

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  • Christopher F.
  • 2/8/2014 12:52:04 PM
  • Tech Level: Average
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggs

Pros: Plenty of power for mini itx rigs

Cons: None so far

Other Thoughts: Running i7 2600k, evga 670ftw, 2ssd and 1 3.5 HD

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  • 1/6/2014 9:30:00 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsPower Supply

Pros: Small, as a SFX ps should be.
Functions as expected.
Wire lengths give best cable management - they go where they go and nothing more.
Bronze efficiency.
$80 when purchased.
Has not died yet.
Any possible but hopefully unneeded repairs will be easy due to layout.

Cons: Will indefinitely break as all things do.

Other Thoughts: Good work, Silverstone. Thank you for providing us consumers with a cheap and efficient power supply.

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  • Carlos S.
  • 11/23/2013 9:17:41 AM
  • Tech Level: Average
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsPerfect

Pros: Great so far, I am running a XFX 7950 with a haswell i3 on a Micro ATX... Very happy with this setup and is wallet friendly!

Cons: None so far!

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Item#: N82E16817256063
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