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SilverStone SX750 Platinum SFX Power Supply Review

The SilverStone SX750 is one of the strongest SFX power supplies.

Silverstone SX750 Platinum
(Image: © Tom's Hardware)

Protection Features

Check out our PSUs 101 article to learn more about PSU protection features.

OCP (Cold @ 30°C)

12V: 76.2A (121.92%), 11.996V
5V: 33.6A (168%), 5.099V
3.3V: 33.5A (167.5%), 3.237V
5VSB: 4.7A (156.67%), 5.021V

OCP (Hot @ 43°C)

12V: 74.6A (119.36%), 12.012V
5V: 33.6A (168%), 5.1V
3.3V: 33.3A (166.5%), 3.236V
5VSB: 4.7A (156.67%), 5.024V

OPP (Cold @ 29°C)

1012.94W (135.06%)

OPP (Hot @ 45°C)

917.91W (122.39%)

OTP

✗ (>200°C @ secondary side)

SCP

12V to Earth: ✓
5V to Earth: ✓
3.3V to Earth: ✓
5VSB to Earth: ✓
-12V to Earth: ✓

PWR_OK

Accurate but lower than 16ms

NLO

SIP

Surge: MOV
Inrush: NTC Thermistor & Bypass relay

OCP at 12V and OPP are appropriately set, but this is not the case for OCP on the minor rails, which have sky-high triggering points for no reason. There is no reason for such high power levels on the minor rails, especially at 3.3V. Nonetheless, the worst of all is the lack of over-temperature protection, or at least we couldn't trigger it, despite our efforts. 

DC Power Sequencing

According to Intel’s most recent Power Supply Design Guide (revision 1.4), the +12V and 5V outputs must be equal to or greater than the 3.3V rail at all times. Unfortunately, Intel doesn't mention why it is so important to always keep the 3.3V rail's voltage lower than the levels of the other two outputs.

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SilverStone SX750

(Image credit: Tom's Hardware)

DC Power Sequencing Scope Shots

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SilverStone SX750

(Image credit: Tom's Hardware)
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SilverStone SX750

(Image credit: Tom's Hardware)

Everything is fine here, since 3.3V rail is always at a lower level than the other two rails. 

Cross Load Tests

To generate the following charts, we set our loaders to auto mode through custom-made software before trying more than 25,000 possible load combinations with the +12V, 5V, and 3.3V rails. The deviations in each of the charts below are calculated by taking the nominal values of the rails (12V, 5V, and 3.3V) as point zero. The ambient temperature during testing was between 30 to 32 degrees Celsius (86 to 89.6 degrees Fahrenheit).

Load Regulation Charts

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SilverStone SX750

(Image credit: Tom's Hardware)

Load Regulation Graphs

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SilverStone SX750

(Image credit: Tom's Hardware)
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SilverStone SX750

(Image credit: Tom's Hardware)

Efficiency Graph

(Image credit: Tom's Hardware)

Ripple Graphs

The lower the power supply's ripple, the more stable the system will be and less stress will also be applied to its components.

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SilverStone SX750

(Image credit: Tom's Hardware)

Ripple Suppression Graphs

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SilverStone SX750

(Image credit: Tom's Hardware)
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SilverStone SX750

(Image credit: Tom's Hardware)
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SilverStone SX750

(Image credit: Tom's Hardware)

Infrared Images

We apply a half-load for 10 minutes with the PSU's top cover and cooling fan removed before taking photos with a modified FLIR E4 camera able to deliver an IR resolution of 320x240 (76,800 pixels).

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SilverStone SX750

(Image credit: Tom's Hardware)

IR Images

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SilverStone SX750

(Image credit: Tom's Hardware)
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SilverStone SX750

(Image credit: Tom's Hardware)
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SilverStone SX750

(Image credit: Tom's Hardware)
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SilverStone SX750

(Image credit: Tom's Hardware)
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SilverStone SX750

(Image credit: Tom's Hardware)

Temperatures are not so high, with the hottest part being the main transformer. 

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Aris Mpitziopoulos
Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.