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Silverstone > 
Item#: N82E16817256084

SILVERSTONE ST45SF-G 450W SFX12V SLI CrossFire 80 PLUS GOLD Certified Full Modular Active PFC Power Supply

  • SFX12V
  • Full Modular
  • 80 PLUS GOLD Certified
  • 90 - 264 V 47 - 63 Hz
  • +3.3V@19A, +5V@14A, +12V@37A, +5VSB@2.5A, -12V@0.3A
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SFX Series 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 true 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 a 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° temperature rating, and reliability for 24/7 operation. Enthusiasts oriented features are also present with single +12V rail and 8pin/6pin 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% loading)
  • Class-leading single +12V rail with 36A
  • Silent running 80mm fan with 18dBA minimum
  • Single PCI-E 8pin and dual PCI-E 6pin 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


±3% Regulation and low ripple and noise performance for high stability


Included SFX to ATX bracket for use in ATX cases


100% Modular cable design for easy removal in a case with cable routes and tie-downs




Learn more about the Silverstone ST45SF-G




Maximum Power
Main Connector
+12V Rails
PCI-Express Connector
1 x 6-Pin, 1 x 6+2-Pin
SATA Power Connector
SLI Ready
Haswell Support
CrossFire Ready
Full Modular
87%~90%(20% to 100% loading)
80 PLUS GOLD Certified
Over Voltage Protection
Input Voltage
90 - 264 V
Input Frequency Range
47 - 63 Hz
+3.3V@19A, +5V@14A, +12V@37A, +5VSB@2.5A, -12V@0.3A
100,000 hours at 25 Degrees C, full load
4.92" x 2.5" x 3.94"
3.2 lbs.


1 x 24 / 20-Pin motherboard connector
1 x 8 / 4-Pin EPS / ATX 12V connector
1 x 8/6-Pin PCIE connector
1 x 6-Pin PCIE connector
3 x SATA connector
2 x 4-Pin Peripheral connector
1 x 4-Pin Floppy connector
Support standard SFX form factor and ATX via included bracket

100% modular cables

450W continuous power output at 40 Degrees C operating temperature rated for 24/7 operation

Class-leading single +12V rail with 37A

Strict +/-3% voltage regulation and low ripple & noise

Silent running 80mm fan with 18dBA minimum

Single PCI-E 8pin and dual PCI-E 6pin connectors support

Active PFC

Quick Info


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

Customer Reviews of the Silverstone ST45SF-G

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  • Paul C.
  • 8/20/2014 6:27:37 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsTiny, seems sturdy

Pros: Feels study and has a good weight. Curious as to the quality of the capacitors inside from the other post. First modular power supply. Connectors are strong.

Cons: wish it came with more cables. Extra cables are expensive.

Other Thoughts: It's going inside a Silverstone DS380 case.

Did you find this review helpful? Yes No

  • W I.
  • 7/24/2014 8:34:53 AM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

2 out of 5 eggsDied after 16 months

Pros: It worked well when it worked.

Cons: It completely died after 16 months of use so I purchased a different brand.

Other Thoughts: This was in a very low-powered HTPC with on-board graphics and died after 16 months of light use. I have a second HTPC built very similar and with an upgraded video card used for gaming as well. It gets heavy use and the Corsair PSU in that rig has been going strong for over 2 years now. Do yourself a favor and get a better quality PSU.

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

  • Marlon P.
  • 7/3/2014 2:31:39 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsSo far too good!

Pros: Lots of drive...even, for power hungry AMD products.
The unit is quiet, I can't notice the sound everyone is complaining about, but then again my CPU fan is a little loud in itself ****

Cons: Non, so far

Other Thoughts: It is a bit early to review, as I haven't had a chance to oversee the longevity of things, but let it be known to all the naysers and those who throw "Watts" around loosely. I have a mini-itx build with an AMD A10 7850k OC'd from 3.7ghz @ 1.24 volts, to 4.4ghz from @ 1.375...and to top it off(...wait for it...) a big R9 MSI 280x 6GB, OC'd to 1160mhz and 1610mhz (stock voltage). I'm even thinking of running my old voltage boosted setting of 1200mhz and 1700mhz(memory) that I used on my 750 Watt PSU...but I want to give things a little more time. So far, I have ran the heck out of Unigine Haven and Unigine Valley GPU benchmarks and have played hours of Titanfall (VERY CPU intensive), and will be throwing in some Elder Scrolls Online once it finishes downloading. This PSU has not broke a sweat. Now, I wouldn't go so far as to run an OC'd FX series CPU at those killer 220+watts, but this PSU will handle ANY FM2+ build you throw at it, including big cards. Even Silverstone themselves doubted me and said "no it won't work, you need 650W(obviously, trying to pre-sale me on their up and coming 600w SFX solution). There are people running this PSU with Nvidia Titans and R9 290's, in fact. ITX's a different world. You don't have 15-20% of your power being eaten up by the hardware, as you do with ATX builds, making this the ITX solution for big hardware.

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  • John C.
  • 6/30/2014 9:27:19 AM
  • Tech Level: Average
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGood to go

Pros: Modular, i will never buy another PSU thats not modular. Quiet can take a load ( 7 4tb drives in RAID 5 video card BlueRay drive and a high end board and CPU.

Cons: Slightly bigger than other SFX PSU's.

Other Thoughts: Does what it said, expensive.

Did you find this review helpful? Yes No

  • Neil Y.
  • 6/10/2014 11:53:06 AM
  • Tech Level: Average
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsPerfect for my SG08-Lite Build

Pros: Small, efficient, clean power. If you need a SFX PSU this is the one to get. I even used it in my SG08-LITE build using the included ATX conversion kit. This is the V2.0 version, which is quiet, and has no coil whine as far as I can tell.

Cons: I guess it could have a little more juice, for those who want to run a monster GPU, and go crazy with a CPU overclock. Although that is probably not advisable in most cases where you would want a SFX PSU anyway.

Other Thoughts: The 600W version of this is coming out soon...well at least Silverstone keeps on saying that.

Did you find this review helpful? Yes No

  • peter d.
  • 3/18/2014 5:28:59 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsGreat Supply for Small Box

Pros: - SFX form factor
- Modular cables
- Quiet
- 450 Watts

Cons: none but remember this is for a small box

Other Thoughts: This supply is ideal for a small Mini-ITX build. I used it to build a system in the Bitfenix Prodigy case using the ASUS Z87I-Deluxe motherboard. The Prodigy is one of the larger mini-itx cases available. The main 12V power cable to the motherboard barely reached. I had route that very directly in order to reach. I don't see this as a negative because you want shorter cables for most mini-itx builds. I like this supply a lot.

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  • Derran O.
  • 3/15/2014 1:58:44 PM
  • Tech Level: Somewhat High
  • Ownership: less than 1 day
  • Verified Owner

2 out of 5 eggsCables Too Short

Pros: Compact, modular.

Cons: Just like other folks have said, the cables are TOO SHORT! I bought this power supply based on compatibility list for the SilverStone ML04 series case. What a waste. Now I need to buy another set of cables, pushing my power supply purchase above $140.

Other Thoughts: SilverStone should supply me with FREE replacement cables!

1 out of 2 people found this review helpful. Did you? Yes No

  • Olivier B.
  • 3/9/2014 8:45:26 AM
  • Tech Level: Average
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsNot quite sure about the price

Pros: Quiet (fan won't start unless it needs to)
Nicely sleeved cables
Fully modular

Cons: Price (see other thoughts)
Length of the cables (see other thoughts)

Other Thoughts: I previously purchased the SILVERSTONE SFX ST30SF 300W for 50$ but I wanted something that could eventually support a high-end gpu so I ended up buying this one (100$). For 50$ more, you get 150 watts in extra and sleeved/modular cables. I think the price gap is a bit high, especially when you compare it to regular atx power supplies. The cables are a bit on the short side for my case (SILVERSTONE MiloML05B) but that might be because of my motherboard layout.

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  • Lawrence H.
  • 2/12/2014 3:38:34 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsGood Little P/S

Pros: Compact with a good power rating. Running Q6600 rig on P45 board with 4G of ram and 4870 for 24/7 folding with no problems. Runs very quiet, doesn't get hot and takes on a fairly hungry system with no problems!

Cons: Short cables, as expected not really a hit, but don't buy this if you have more than 10" of distance between your P/S and peripherals. Thin cable set not included, and now it is out of stock almost everywhere!

Other Thoughts: I bought this power supply for a future itx build but had to "borrow" it while I was re-purposing an old rig to do Folding@home. When it comes time to make the switch to the itx system, I know this little gem will power it with no problems!! Thanks Silverstone, you restored my confidence in your products.

Did you find this review helpful? Yes No

  • Anonymous
  • 2/5/2014 11:22:28 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsBetter than the first...

Pros: SFX with short cables
80+ Gold
Fully modular

Cons: Same as before...
Power cables plug in too tightly. Takes significant effort to plug/unplug 24 pin.
Cables are very stiff. Better cables (search for PP05-E) cost extra.
My second one makes the same intermittent buzzing sound that I RMA'd the first for. It's much quieter and less often than the first was so I'm not going to RMA again... yet. Glad it has a 3 year warranty.

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Item#: N82E16817256084
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