5-way High-End 1KW+ PSU Round-Up


Looking at the results over the previous two pages combined with the appearance and features of each of the PSU's, it's hard to single out one overall winner. Both the Silverstone, Enermax and Cooler Master units provide very stable voltages on the +12v rails with the Corsair unit also showing rock solid voltage up to 75% load, and only dipping slightly once 100% load is applied. Results on the +5v rail are very good for all units with the lowest voltage (4.89v) coming from the Enermax Revolution at 100% load.
The +3.3v rail results show a bit of separation between the units with the Corsair HX1000 having the lowest output voltages of 3.2v at full load, but also having the least fluctuation of 0.3v between 50% and 100% load levels. Units providing the best combination of voltage and stability on the +3.3v rail are Cooler Master's UCP and Enermax's Revolution, both of which not only have substantially higher output voltages than the Corsair, but also came within a whisker of its fluctuation results.
When it comes to efficiency the Enermax Revolution is the clear winner with levels approaching 90%. As expected, this also has the side-effect of making the Revolution one of the quietest and coolest running PSU's in the group with the least amount of energy being transformed into heat. Cooler Master and Corsair are also worthy of a mention here with their 135mm fans and almost-as-impressive efficiency levels resulting in cool running, reasonably quiet operation under heavy load.
While we've only touched on the actual features of each unit in today's review, the Cooler Master, Enermax, Silverstone and Corsair units need to be commended for their full support of triple-GPU systems. In addition to this, certain aesthetic features of each PSU, such as the rugged finish of the Cooler Master UCP, the excellent modular cables on the Corsair and the compact size of the Be-Quiet are all things that will appeal to enthusiasts depending on the intended use of the PSU.
The awards, final score and pro's and con's of each PSU can be seen below, but while some manufacturers will be going home empty handed, there are no real losers in this round-up. Each PSU has its own merits, and while some couldn't quite keep up with the stability and voltage output of the rest, no unit failed to provide its rated wattage output.
Be-Quiet Dark Power Pro 1200w - £173.89 from After Hours
The Good
• Compact size makes it a good candidate for smaller PC Cases.
• Easy to use, colour coded modular system with high quality cables.
• Good looks.
The Mediocre
Lack of PCI-E connectors for triple-GPU configurations. *
• Average efficiency for the group. Between 83-84%.
• Not the quietest of the bunch despite its name.
The Bad
• Low performance on the +12v rails.
* UPDATE 06/10/08 - Be-Quiet have informed us that an adapter cable should have been included in the box which provides the ability to run triple-GPU configurations with six PCI-E connectors.
Cooler Master UCP 1100w - £179.98 from Ebuyer

The Good
• Fairly quiet under heavy load.
• High efficiency levels around 86-87%.
• Extremely rugged finish and tough looks.
• Good all-round voltages and stability.
• Features such as soft-on and a 5yr warranty.

The Mediocre
• Fairly expensive.
• Cable sleeving quite slack and spoils the units look.

The Bad
• Nothing to report.

Overclock3D Recommended Award
Corsair HX1000 1000w - £146.99 from Ebuyer

The Good
• Silent and cool operation.
• Amazing value for money.
• Extremely nice and easy to route modular cables.
• Support for triple-GPU configurations with 6x PCI-E connectors.

The Mediocre
• +3.3v rail voltages run a little low.
• Very stable +12v rails up to 75% load, but slight droop thereafter.
• Good efficiency of 84-86%.

The Bad
• Nothing to Report

Overclock3D Value For Money Award
Enermax Revolution 1050w - £TBA

The Good
• Unmatchable efficiency at almost 90%.
• Very cool and quiet operation.
• Stable +3.3 and +12v rails.
• Support for triple-GPU configurations with only four cables.

The Mediocre
• +5v not quite as stable as other units, but nothing to worry about.
• Bit of an ugly ducking in its current form, but Enermax have already corrected this (1,2).
• No official price as yet.
• Only a pre-production unit. Things may change on the retail product.

The Bad
• Nothing to report.

Overclock3D Editors Choice Award
Silverstone Zeus ZM1200M - $399.99 from Newegg

The Good
• Good overall voltage stability on all rails.
• Manages a 0.98-0.99 power factor.
• Support for triple-GPU configurations.

The Mediocre
• Pretty poor efficiency compared to the rest of the group.

The Bad

• Noisy and hot under full load.
• Longest PSU in the group makes it not suitable for smaller cases.

Thanks to Be-Quiet, Cooler Master, Corsair, Enermax and Silverstone for making this review possible.
Discuss this review in our forums.
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Most Recent Comments

03-10-2008, 09:03:52

"Looking for a new 1kw+ PSU? We test Be-Quiet, Corsair, Cooler Master, Enermax and Silverstone's latest and greatest units on the most sophisticated equipment."


5-way High-End 1KW+ PSU Round-UpQuote

03-10-2008, 09:19:16

Great round-up review Jim. Shame about the Be-Quiet though, was really hoping for great things from them Quote

03-10-2008, 09:34:14

WC Annihilus
Mmm... I got one of those CM UCP 1100W that I won at Nvision sitting in a box brand new. Really need to get around to selling it >.> Maybe linking this review will net some interestQuote

03-10-2008, 09:34:27

The Corsair HX 1000W looks brilliant.

Nice review, enjoyed reading it. Quote

03-10-2008, 11:14:34

Ooh, that enermax looks nice!Quote

03-10-2008, 11:22:35

Originally Posted by name='teknokid'
Ooh, that enermax looks nice!
Hope you mean the revised version


03-10-2008, 11:38:02

they all look rather nice

but isnt 1k overkill for all but the highest of high end systems now? Quote

03-10-2008, 11:39:05

Originally Posted by name='Jim'
Yeah :P

Its quite a design change, but does look pretty awesome.. Nice review Quote

03-10-2008, 12:07:13

I like the look of that revolution ^^. Only thing is, my PSU sits at the top of the case, so it would look a bit stupid to have the writing upside down. Is it t'other way up on the other side?

Nice review tho, but real shame about the be-quiet, at least there are some really good alternatives now.Quote

03-10-2008, 13:46:25

Nice review. The link for the PCP&C TurboCool on the first page is broken tho, it takes u to the Silverstone Zeus 750W review. I don't think I will need one of these PSUs until 2000W is the standard for extreme high-end with the hardware I tend to use lol.Quote

03-10-2008, 15:18:01

Seriously good review. U just dont see these sort of tests done enough. Saw some old tests similar to this that came to the conclusion that power ratings were extremely exaggerated (the spelling thing says I spelt it right ??). That was b4 we had efficiency ratings and such standards. Reaching 1kw on a cold day in a lab once, no longer cuts it.

I'll post a few exceptions I have:

  • I wouldnt 'con' the Silverstone psu for being longer. If u have a smaller case with this psu - theres other wrongs being committed.

  • I'd like to massage into the graphs the +/- lines that the ATX standards perceive for the voltage levels. If a psu varies a fair bit, but remains within that +/- by a %, I think that's another criticism of the units.

  • If u dont have 4 way sli or 20 hdd and everything overclocked, including the usb line, I want a serious answer as to why u have a 1kw+ psu. Yet alone paid over £150 for it. £150 is a good mark up for Corsair. The Silverstone is massively priced.

Cut the price on the CoolerMaster one and it'd be awesome over-poweredness for the price. Corsair seems to be the banker tho.


04-10-2008, 15:25:24

Fantastic review as usual Jimbo, some sexy PSU's there and just goes to show that OC3D REALLY tests stuff Quote

04-10-2008, 18:33:46

fantastic comparative review, i was a little disappointed by the be quiet mind. wish you'd written this a month ago Quote

04-10-2008, 18:39:02

Originally Posted by name='ionicle'
they all look rather nice

but isnt 1k overkill for all but the highest of high end systems now?
Yea unless youre like me and are developing a peripheral toaster that runs off the PSU Quote

04-10-2008, 19:00:02

Originally Posted by name='llwyd'
Yea unless youre like me and are developing a peripheral toaster that runs off the PSU

"the USB toastomatic" Quote

05-10-2008, 10:22:57

haha, What sort of equipment is used to test psu's?Quote

05-10-2008, 10:49:44

Originally Posted by name='teknokid'
haha, What sort of equipment is used to test psu's?
If you actually read the review it tells you...Quote

05-10-2008, 11:36:16

Originally Posted by name='Ham'
If you actually read the review it tells you...
ooh, I only looked at the end and the enermax revolution :SQuote

05-10-2008, 16:13:33

Originally Posted by name='ionicle'

"the USB toastomatic"
How did you get hold of my secret latest invention plans? That was due to be unveiled next year...Quote

07-10-2008, 16:34:37

Hah you guys crack me up some times.. seriously

Great review, not that I'll be in the market for a PSU like that for a long time but it is really worth knowing that kind of information. Nicely tested, shows (as stated before) OC3D really go to the inth degree to test and make their reviews as accurate as possible!

Thanks guys Quote

08-10-2008, 05:21:56


Well powerfull PSU's needn't run on max to provide the juice needed and hence can run cooler... But ..


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