Corsair RM750x 750W Power Supply

REVIEW INFORMATION
SUPPLIED BY: Corsair
MANUFACTURER: Corsair
PRODUCT: RM750x 750W
PROD LINK: Corsair’s current offerings
PRICE: $129.99 @ NewEgg
Price is at the time of testing!

When I load test, well you know I’m gonna be, I’m gonna be the man who runs a load tester for you. When I measure, well you know I’m gonna be, I’m gonna be the man to… aw, nuts to this. The Proclaimers have way more than the one good song I could be referencing right now. So while I’m worth my room on this earth, here’s the gear I’ll be using for load testing: one SM-268 load tester, one Rek RF9901 power meter, one Extech DMM, one dual probe thermometer, and the Tektronix TDS-2012B scope.

I’m on my way to test standby efficiency today. Uh-huh, uh-huh, uh-huh, uh-huh.

RM750x 750W – STANDBY Load Tests
Test # +5VSB DC Watts/
AC Watts
Eff. P.F.
Load Tests
1 0.5A 2.52W/
3.07W
82.1% 0.230
5.03V
2 1.5A 7.50W/
9.48W
79.1% 0.412
5.00V
3 3.0A 14.9W/
18.9W
78.8% 0.483
4.96V

No surprises here. This unit shares the same standby circuitry as big brother, so it gets roughly the same results. Better than average for efficiency, but nothing too spectacular apart from test one pulling down that fantastic 82% number.

I get 1.4% for a load stability result, which is an excellent number to see here.

We’re off to the main tests, now.

RM750x 750W – Cold Load Tests
Test # +3.3V +5V +12V DC Watts/
AC Watts
AC
Input
Eff. P.F. Intake/
Exhaust
Progressive Load Tests
1 1A 1A 5.2A 75.9W/
90.1W
121.0V 84.2% 0.965 25°C/
26°C*
3.30V 5.01V 12.05V
2 1.5A 1.5A 11A 152.3W/
171.5W
120.6V 88.8% 0.985 26°C/
27°C*
3.29V 5.01V 12.04V
3 3.5A 3.5A 28A 374.9W/
414.1W
120.4V 90.5% 0.996 29°C/
30°C*
3.29V 5.00V 12.00V
4 5A 5A 42A 556.5W/
620.3W
119.7V 89.7% 0.996 28°C/
44°C
3.28V 5.00V 11.97V
5 7A 7A 56A 743.9W/
841.5W
118.7V 88.4% 0.997 29°C/
47°C
3.28V 5.00V 11.94V
Crossload Tests
CL1 18A 18A 0A 154.0W/
188.9W
119.0V 81.5% 0.988 28°C/
36°C
3.28V 5.00V 12.02V
CL2 0A 0A 62.5A 752.5W/
849.6W
117.0V 88.6% 0.997 28°C/
43°C
3.29V 5.00V 11.96V

* Fanless operation.

The 1kW unit was mind-blowing on these tests, clearing Platinum. This one… is not quite up to that challenge. But, we do get a pretty clean pass for Gold, and that’s really all we can expect. I’m happy, anyway.

Fanless mode operated up until test three, and then the fan kicked in as soon as I hit the button for test four. It’s basically the same result there we had with the 1kW.

Let’s run some numbers on the voltage readings. For stability, moving from left to right, I see 0.6%, 0.2%, and 0.9%. Sa-weet! That’s an average of only 0.57%, which is way better than excellent. Corsair, you are off to an amazing start again, here.

Next page, please.