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Item#: N82E16817256084

SILVERSTONE ST45SF-G 450W SFX12V SLI Ready CrossFire Ready 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

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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  • Eric k.
  • 1/20/2015 10:01:30 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsSmall and powerful

Pros: Steadily delivers power and has a very compact size that fits very well in my mini ITX build. The power supply is actually very quiet.

Cons: It says it is SLI ready, but it only has one dedicated PCI-E connector slot (the blue connector). The power supply is meant to be used in their very small cases, but it comes with very ridged cables that make cable management very difficult. They offer slim power cables as a separate purchase, but the cables should really be included.

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  • Robert B.
  • 12/23/2014 6:07:13 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsnice compact power supply

Pros: Small, quiet, modular. I used this power supply in a Cooler Master Elite 110 case.

Cons: The cables were a bit bulky for a small case, but still manageable. Too bad the smaller cables aren't included with this power supply.

Other Thoughts: Some people choose to buy the smaller cables. I didn't do that. I had to mash down the main motherboard connector to get it to fit under my Corsair H80i liquid cooler.

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  • Anonymous
  • 11/30/2014 2:41:02 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

2 out of 5 eggsDisappointed with this v2.0 model

Pros: Small form factor, completely modular, flat cables. I've purchased several of the 450W model and several of the 600W model for beefier builds, so of course I like them overall... until now.

Cons: Loud. The earlier models that I own are whisper quiet, but my v2.0 unit has a loud whine, so much so that I can hum the precise pitch. <sigh>

Other Thoughts: Great PSU other than the fan noise. Silverstone really needs to put a better fan in these things. Most people who want to build an HTPC or a small ITX machine for their desktop are not going to want to endure hours of listening to a loud fan that whines.

Manufacturer Response:

Thank you very much for purchasing a SilverStone. There is a chance that your ST45SF-G may be defective if it has loud whine constantly during low load or high load conditions, if possible, please check with Newegg or our US office to see if you can return it and exchange for another one.

Below is our contact info:


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  • Bryan H.
  • 11/25/2014 8:02:30 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

2 out of 5 eggsPower Cable WAY to short!

Pros: Have not been able to power it on. Unknown at this time.

Cons: I got this power supply to go with my SILVERSTONE Black MILO ML03vHTPC Case. The case claimed to be ATX yet could not fit both a normal size power supply and a dvd or blue ray drive. So after putting aside my Seasonic PSU, I purchased this one as it claimed to be ATX compatible and was small enough to fit in the case and have room for the dvd drive. I figured since it had one of the highest ratings of this size and was by the same manufacturer as the case, it should be a good fit. I was wrong!

The ATX 24 pin connector was the shortest cable included with the PSU. Typically this is the longest cable included. Minus the connectors, it was only around 9 inches long. I have a mini itx motherboard and it could not even fit being mounted on the opposite side! Only way this power supply will fit is if it is mounted on the same side as the connector or directly above the board.

Since I am stuck with needing a smaller psu to go with this motherboard to fit in the case, I am going to have to purchase an additional 24 pin ATX extension cable. I may update this review once I have gotten the extension cable in and have had a chance to actually test the PSU out.

Other Thoughts: PSU has a short ATX 24 pin connector. Make sure you measure the distance between where the PSU will be mounted and the connector on the motherboard. May need to choose a different PSU or purchase this extender:

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

  • Simon P.
  • 11/21/2014 1:37:22 PM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsBelle surprise / Nice surprise

Pros: Delivers power as advertised. I checked with a multimeter before hand and all voltages are slightly above specifications. Very good! .......... Délivre une puissance telle qu'annoncée. J'ai utilisé un multimètre avant l'installation, et toutes les tensions/voltages des lignes sont légèrement au-dessus des spécifications. Très bien, très bon!

The fan is in pull mode, unlike usual PSU fans which are in push mode. Which is perfect for my case (Lian Li PC-Q30) since doesn't have any vent holes for a PSU fan (the PSU is mounted with the fan facing the mobo) ......... Le ventilateur est en mode extraction aul lieu de l'habituel mode en prise d'air, ce qui est parfait pour mon chassis LIan Li PC-Q30 n'offrant pas de fentes d'aération pour le PSU (ce dernier est monté avec le ventilateur faisant face à la carte mère)

Pas d'interrupteur, ce qui est bien pour un HTPC totalement contrôlé via télécommande, et devant répondre aux demandes de mise en service réseau ............... No power button, which is ok for an HTPC. I was baffled at first when nothing happened after pluging the PSU on the electrical outlet (since during the multimeter test while shorting the green pin, plugging to the outlet would power it up automatically), but then I plugged the case's power button, used it and voilà, it works.

La surprise : silencieux ! J'ai pris le risque de l'acheter malgré les évaluations disant qu'il est très bruyant, mais ce n'est pas le cas, c'est relativement silencieux, aucun problème de ce côté .............. The surprise: quiet! I took the risk in buying this although many evaluations state that it's noisy, but actually it's relatively quiet. Before receiving / installing this PSU, I began looking up the Web for a fan replacement solution, and this surprise has put an end to such loss of time.

Cons: None / Aucun

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

  • Anonymous
  • 11/9/2014 9:34:24 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

2 out of 5 eggsSmall and Noisy

Pros: compact, fully modular, delivers on promise of solid clean power.

Cons: Fan is loud when running the PC under heavy load, medium load or normal load. This is a small form factor unit so it is likely to be used in media center builds - too loud for that.

Other Thoughts: Compact set up has high potential - if they went fanless design it would be great. Leaves tons of room in my compact build. Swapping it out for a full size with quieter fan.

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

  • nicholas b.
  • 11/8/2014 11:31:02 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

3 out of 5 eggsloud

Pros: small size to fit some specialized cases (FT03 MINI)

Cons: Loud all of the time. even idling this this is loud. I can heat it droning even with my PC under the desk inside a cabinet.

Other Thoughts: Many users replace the fan with a Noiseblocker NB-BlackSilentPro PC-P 80mm x 15mm. To do this you must void the warantee AND risk death...Apparently working on power supplies can be dangerous. Last but not least- that Noiseblocker can be hard to find.

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

  • Evan B.
  • 10/28/2014 7:56:15 AM
  • Tech Level: Average
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsGreat PSU, Horrible Cables

Pros: Works great, reliable, and I'm not getting any fan whine like others are. If I am getting fan noise, I can't hear it over my other fans.

Cons: These cables suck. They are stiff, and the sleeving is poorly done. Silverstone should include their slim cables with the PSU instead of charging 30 bucks extra for them. It's almost like they give cruddy cables to force you to buy the slim ones.

Other Thoughts: The 600W Modular SFX PSU was released earlier this year. Go check it out before you buy this one, especially if you're powering a small gaming build.

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

  • Christopher R.
  • 10/19/2014 11:09:23 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsNoisy Fan & Solid Power Lose-Win

Pros: This PSU is small, this is my first experience with an SFX and I couldn't believe how small it was upon unboxing. This compact nature is awesome as it enables builds like the RVZ01. It is providing good power for my gaming rif. The packaging was good and unit was received intact. The contents of the box were adequate for my installation needs.

Cons: The Fan is Noisy. I have a V2 of this unit and it's not any better than all the reviews I see from previous people with the V1. It's not noisy because of working hard and pushing air, but rather from poor quality. It is rattling just slightly but with the RVZ01 the PSU intake is on the side making this noise very apparent outside of the case. I'd love to see a unit like this with a better fan. SILENT is valuable for a PSU and it's not like it has to do a whole lot if good components are used for circuitry.

Other Thoughts: Cables are a little stiff, Silverstone should just upgrade to the flat cable set for the price of this thing rather than subjecting all of us customers to purchasing extras just to get the best product. I found their length adequate for my case but was surprised how short the 24pin mobo lead is.

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

  • Christopher T.
  • 9/29/2014 8:52:11 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsNot "perfect" but VERY good.

Pros: * Small, designed to fit in Silverstone's Raven Z/Milo ML07 ITX case.
* Provides adequate power for an ITX based HTPC/single-GPU light gaming build. (i5-2500K, GTX 750 Ti, ML-07 case.)

Cons: * Louder than I expected, but that is something I'm very sensitive to (see Other Thoughts.)

Other Thoughts: Other reviews will speak much more about this PSUs efficiency and capacity, I can really only speak subjectively about my experience using it. Noise was going to be the determining factor for me in my satisfaction with this unit (knowing that the parts it supplies power to are well, well below threshold.) Sadly, it's the loudest part of my system.

That said, to give you some perspective on my setup: in a room with ANY ambient sound (movie, TV, conversation) the PC is inaudible... until you crank up a GPU-intense game, then the 3 fans (CPU, GPU and PSU) spin up to an audible light whoosh of airflow. Quieter than my super-slim PlayStation 3 when it's on, but noticeable.

Otherwise, I can only hear it when the room is empty and completely quiet - if the refrigerator compressor is running in the next room, it's hard to discern the sound. Even then, the noise is not unpleasant enough to be distracting, it is just noticeable. If you're an SPCR junkie like me (you know who you are!) you might want to wait until the 500w, 120mm fan version of this PSU comes out. It's likely to be closer to what you want. For just about everyone else, enjoy the PSU. :-)

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

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Item#: N82E16817256084
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