Reviews - Corsair TX750M 750W
Sample Provided by: Corsair (By OklahomaWolf on Tue, Sep-13-2011)

Page 2 - Cold Testing

Here we go - the fun stuff. Once again, the SunMoon SM-268 will be the Kriss to my Kross, and several other gadgets will be jumping to help me out. They include my Rek RF9901 power meter, a multimeter, a Tektronix TDS-2012B oscilloscope, and a dual probe thermometer.

Results from Corsair TX750M
STANDBY load tests
Test # +5VSB DC Watts/
AC Watts
P.F. Eff.
1 0.5A 2.49W/
0.246 77.3%
2 1.5A 7.43W/
0.429 77.2%
3 3A 14.8W/
0.511 75.5%

Let's get the standby load tests done first. Just a reminder - this is with the main power off, and only the 5VSB rail loaded down.

As usual, these don't see very high efficiency and no power factor correction. At loads this low, prioritizing efficiency and PFC is like buying bottled water... of course you can do it, but 99% of the time there's no reason to when there's a perfectly good sink with filtered, clean city water right over there. What's my point? Just this - we're dealing with less power at the wall than your digital cable box pulls when it's supposedly turned off.

Results from Corsair TX750M low load test
+3.3V +5V +12V 5VSB -12V DC Watts/
AC Watts
P.F. Eff.
9.6% 1.5A 1.5A 4.5A 0.5A 0.2A 71.7W/
0.974 81.2%
3.33V 5.06V 12.05V 5.05V -11.70V

Now for the low load test, and a look into what the unit does at the 10% load level 80 Plus doesn't do any testing at. Optimizing a unit for Bronze means optimizing efficiency between 20% and 100% loads... this usually means kissing high efficiency goodbye at the lower loads. And that's exactly the case again here. But wait... 81.2%? That's... actually still quite close to Bronze. This unit is close to passing the minimum requirement for Bronze at the 10% load level! That's very impressive, actually.

Results from Corsair TX750M COLD load tests
Test # +3.3V +5V +12V DC Watts/
AC Watts
Eff. P.F. Intake/
Progressive load tests
1 1.5A 1.5A 12A 161.8W/
86.0% 0.981 23°C/
3.32V 5.06V 12.03V
2 3A 3A 23A 308.1W/
86.8% 0.994 23°C/
3.30V 5.03V 11.99V
3 4A 4A 34A 449.0W/
86.0% 0.996

39 °C

3.28V 5.01V 11.94V
4 5.5A 5.5A 45A 592.7W/
84.1% 0.998 25°C/
3.26V 4.98V 11.89V
5 7A 7A 56A 737.5W/
81.7% 0.999 26°C/
3.24V 4.95V 11.84V
CL1 18A 18A 1A 164.3W/
79.3% 0.985 25°C/
3.26V 4.93V 12.02V
CL2 0A 0A 62A 738.4W/
82.0% 0.999 26°C/
3.27V 5.01V 11.83V

And yes, the unit does pass Bronze at all other load levels, too. This is good.

What is also good can be found in the voltage readings. This is not the tightest regulating unit I've ever seen, but it is above average. 3.3V is the worst, at about 2.5% deflection between tests one and five. 5V is next, coming in at around 2.2%. Finally, the important one, 12V, hands in 1.6% regulation. Nice, for a value oriented unit.

Slightly less nice? The temperatures we see by test five at the exhaust. This unit is supposed to be good to 50 degree ambients. I hope it can take my hot box punishment. Ah well - nothing to do but roast it alive and see what happens. Next page, if you please.

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