Corsair AX750 80 Plus Gold: Putting Corsair's Best to the Test
by Martin Kaffei on November 30, 2010 12:00 AM EST- Posted in
- Cases/Cooling/PSUs
- Corsair
- PSUs
- 80Plus Gold
- 750W
Efficiency and PFC
| 230VAC, 50Hz | ||
| Load | Efficiency | PFC |
| 10% | 83% | 0.800 |
| 20% | 89% | 0.903 |
| 50% | 91% | 0.970 |
| 80% | 89% | 0.982 |
| 100% | 88% | 0.986 |
| 110% | 88% | 0.989 |
| 115VAC, 60Hz | ||
| Load | Efficiency | PFC |
| 10% | 82% | 0.917 |
| 20% | 88% | 0.970 |
| 50% | 90% | 0.986 |
| 80% | 88% | 0.990 |
| 100% | 88% | 0.993 |
| 110% | 87% | 0.994 |
With 80 Plus Gold certification, we expect high efficiency and the AX750 delivers. It doesn't matter whether you live in the USA or Europe; the efficiency is always high and 80 Plus Gold is no problem for the design. Maximum efficiency comes at 50% load as expected, but even on 115VAC the efficiency is always at 88% or higher provided the load is at least 150W. Worst-case efficiency at a low load of just 75W is still 82%, so we really can't complain--at such a low load, the difference between 82% and 90% efficiency amounts to only 8W. Besides, as we pointed out on the noise tests, the hardware required to even push a 750W PSU to the limits is such that you're likely to idle closer to 150W (or higher).
The power factor is also good,, staying above .90 on 230VAC as long as load is above 20%. That drops to just above 0.800 at 10% load, but any high-end system requiring the AX750 is going to be higher than that.
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Qbah - Friday, December 3, 2010 - link
And this thing is amazing. The silence is simply incredible! Best PSU there is IMO.akashagarawal3d - Monday, December 20, 2010 - link
hi! all of u: i want to know that will it support my system:amd phenom 2 x4 965 be @4ghz
6gb ddr3-1600 mhz kingston ram oc
msi -890fxa-gd70
benq g2420hd
xfx hd 6970 2gb gddr5 950/1400
will it support my sys.
DarkUltra - Sunday, January 23, 2011 - link
Hi!I have horrible squealing when I have high FPS in games (game menus especially) or other type of GPU load. I believe it is a combination of my PSU and graphics card. I've tried two cards and two psus. GeForce gtx 285 and gtx 470 both squeal much more with a Mist 650W rev 4.0 than the Mist 650W rev 3.5. The only difference is that the rev 4.0 have one 50A 12V rail while the quieter rev 3.5 have four 20A 12V rails.
http://www.bit-tech.net/news/hardware/2009/05/29/m...
The mists are known to be squealy I heard, but how about the Corsair AX750 80 Plus Gold? Can you try it with a few recent 3d cards? I'm looking for a quiet psu/gpu combo.
Nzeman - Wednesday, March 16, 2011 - link
Thanks for the review, great as always. I will be getting this PSU in my new build for sure.