Efficiency
The efficiency ramps up very slowly on this unit. The efficiency with 100W of load isn't very good, but it improves at 200W. Then it slowly moves towards its zenith, which is reached at 50% load (500W). Efficiency is as high as 86% with an AC input voltage of 230V. That's a good result, though many high-end power supplies match that figure - we have seen 86% efficiency from most of the units tested lately. With 120VAC, the result is also very good as it is still very close to the 230VAC results. 84% efficiency is very good for the lower input voltage, ranking as one of the better results at this input to date. Still, the Corsair HX1000W cannot equal the recently tested Xigmatek NRP, which has a better overall efficiency rating.
Power Factor Correction
The PFC works the same as similar models built by CWT. It has very high and good results with lower input voltage and the folks over in Europe will need to be satisfied with up to .98 (PFC) tops.
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Gholam - Wednesday, April 30, 2008 - link
I set up a pair of Dell PowerEdge 2950 III servers last week, each one running a pair of Xeon 5410 CPUs (2.33GHz quad-core), 8x2GB FB-DIMMs, and a pair of 15k rpm SAS drives hooked up to a PERC6 - peak power draw registered by BMC has been 293W so far on one box, and 276W on the other.HOOfan 1 - Wednesday, April 30, 2008 - link
and how many graphics cards are you running?Gholam - Thursday, May 1, 2008 - link
None, but desktop systems aren't large banks of FB-DIMMs either, nor multiple quad-core CPUs or rows of 15k rpm fans. The most power-hungry graphics card today is well under 200W power draw. You really, really have to work to exceed 500-600W power draw on a modern computer.Powervano - Tuesday, April 29, 2008 - link
I like most of your reviews very much guys and I have a suggestion/wish for the future reviews.Can you test (if possible, of course) Inter-Tech CobaNitrox IT-7750SG PSU?
I would also like to see the tests of FSP Epsilon series PSU.
Christoph Katzer - Tuesday, April 29, 2008 - link
Epsilon has already arrived and will come soon. CobaNitrox might not be interesting for most readers since (I think) they're only available in Germany.Powervano - Tuesday, April 29, 2008 - link
Nice to hear about Epsilon. I have seen about 87-89% efficiency about Epsilon series on several web-sites and I would like to see professional tests about that PSU.Yes, CobaNitrox is only available in germany, but it comes relatively cheap compared to other high quality PSUs and it is very interesting does it offer same functionality as other PSUs in the same class do?
Christoph Katzer - Tuesday, April 29, 2008 - link
http://www.planet3dnow.de/artikel/hardware/netztei...">http://www.planet3dnow.de/artikel/hardw...etzteile...HOOfan 1 - Tuesday, April 29, 2008 - link
Another CWT....Powervano - Tuesday, April 29, 2008 - link
Good review, but not the same high quality one as I see here, at AnandTech...JarredWalton - Tuesday, April 29, 2008 - link
Note the author. ;) But of course, that's about a year and a half old.