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SilverStone ST45SF-G 450W SFX Form Factor PSU Review

Manufacturer: SilverStone

Efficiency, Differential Temperature and Noise

Efficiency

Efficiency is defined by the power output divided by the power input and is usually expressed as a percentage.  If a PSU were a 100% efficient (which none are) 400 watts of AC power going in would result in 400 watts of DC power coming out (with no waste heat to dissipate).  In the real world there are always inefficiencies and power is lost in the form of heat during the conversion process.

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Newer revisions to the ATX12V Power Supply Design Guide V 2.2 have continued to increase the efficiency recommendations for PC switching mode power supplies and now lists both required and recommended minimum efficiencies.

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I measured the AC power input to the SilverStone ST45SF-G PSU with the Extech power analyzer while the total DC load was found by adding all the individual +3.3V, +5V, +12V, -12V and +5VSB loads together. 

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The overall efficiency of the SilverStone ST45SF-G is very good and complies with the 80Plus Gold criteria even when operating at elevated, real-world operating temperatures. 

80 Plus Program

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Note 1: Power Factor =0.90 (50% to 100% Load)
Note 2: Tests conducted at room temperature (25°C)

Differential Temperature and Noise Levels

The differential temperature across the power supply was calculated by subtracting the internal case air temperature (T in) from the temperature of the warm exhaust air flowing out the back of the power supply (T out). 

Thermocouples were placed at the air inlet and exhaust outlet. The ambient room air temperature was 23ºC (74ºF) +/- 0.5ºC during testing.

T out = temperature of air exhausting from power supply
T in = temperature of air entering power supply
Delta T = T out - T in

Sound pressure level readings were taken 3’ away from the rear of the PSU in an otherwise quiet room.  The ambient noise level was ~28 dBA. 

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The SilverStone ST45SF-G PSU is relatively quiet while operating under a light to medium load.  But when the load was increased to the maximum 450W output, the fan noise became very noticeable.

November 6, 2012 | 12:23 PM - Posted by Kenneth (not verified)

I bought a Silverstone Strider ST50F-P psu about 2 years ago for a home server build. I bought it specifically to fit into a Lian Li PC-V354 case which has the psu standing on end over the mobo while looking at it from the side. I wanted a nice short psu that wasn't going to be tasked with high demand of power and it fit the bill. If I were to do it all over again, I am not sure I would go with this unit that was reviewed. While it is 40mm shorter overall and would give me a little bit more room to work in that particular case, it also has a 40mm smaller fan. I use that fan to pull air from the inside to the outside and the size trade off would be pretty steep. I guess this would be nice for a mini ITX build where space is at a super premium but otherwise I would still grab something with more air flow.

November 9, 2012 | 05:27 AM - Posted by Justin 150 (not verified)

I think the noise is the main issue here. Seems very well designed.

If you are not pulling more than 150W on load then a pico-psu is probably a better option. Even at 225W the Silverstone seems pretty quiet but from there upwards the noise seems to increase pretty rapidly.

If needing 300W + and have the space there are better options

November 19, 2012 | 08:29 AM - Posted by Robert123 (not verified)

Perfect upgrade for the sg05 & 06. esp if you have the older 300w versions.

December 31, 2012 | 09:40 AM - Posted by David López (not verified)

Be careful!. I have SG06, and this Power supply modular need some depth extra mm, because the connector is big than normal version.
It can be fit, but you need to make a lot of force, and curve a lot the wires, isn't god the modular version because need more space.

Other part is that the sound is horrible!, make a lot of plus sound than the standard version, even at 60-90W only of consumption!.
If you need more than 140W is horrible loud!

I open the power supply, and first I try to mount the fan outside the power supply chassis, and decrease some little db, because the little grid on intake increase loud, and the grid on outside pard not increase as intake. This decrease a little, but not to much, but you need 15mm extra of space, and be care of obstruction fan, and lost warranty of you new power supply.....

Today I will go to buy a fan for replace, I check this models that can be well (3000rpm models):

http://www.sunon.com/pro.php?c1=16
http://www.rexususa.com/fans/25816.html
http://www.rexususa.com/25816-1.html
http://www.nmbtc.com/fans/part-numbers/search/3106KL-05W-B50/5099

The stock fan reach 3500rpm at 42db, but I don't know cfm. I not remember the trademark, I thinbk was similar than rfl, but I remember has 4 letters not three. Personality, for some around 4€ extra Silverstone can be put a better fan, and better control of speed, I not trust never more on Silverstone specifications.... they can be crazy when was putting silent on your specifications!

Other part is the rpm control have fails, bacause when increase the power consumption increase the rpm (and loud), but when you recover a low consumptions the rpm not decrease at the initial levels, and was more louder than the same consumption of before...

I made another easy mod that not need broke anything, I put a 60x60x25 silent fan rear the power supply extracting the air, I attached with prolimatech magnetic supports.

Because I think is better always that the pressure need to be positive, I put this extracting fan at low rpm, then the intake fan capabilities are better than this outtake fan capabilities.
For better dissipation the fresh air need to stay some seconds or miliseconds and arrive to all deepth of power supply. This is thinked normally for a good heat dissipation on cars, and I think is ok also for computer or all that need heat disipation.

If you not need more than 300W, the standard version is better. I have i7-3770T(80W), and also plus GTX 660(140W) the standard 300W Power supply is suficient, with plus margin for sata devices.

I buyed only for gold plus certification and for better quietness sound of the standard version, and I think a was make big mistake for this caprice....

If i know all this before, I never buyed, because is truth that I not need....

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