Legit Reviews

Hi People,

First of all, thanks to the staff for the power supply review,

(8-way SLI and Crossfire Power Supply (PSU) Roundup - Wed, Jun 21, 2006)

.... it has helped me decide on a power supply to purchase.

I am thinking of purchasing OCZ's GameXStream 700W.

I want to use two XFX GeForce 7950 GX2 in SLI and the instructions say that for two in SLI there should be a minimum 650W PSU with 12v current rating of 34A.

I just wondered if someone could help me determine if this PSU meets or exceeds the 12v current rating of 34A requirement.

Does this mean 34A on a 12v rail?

I am unable to determine this from the pic of the PSU spec plate:

(http://www.legitreviews.com/article/348/6/)

... it shows a max current output of 36A under +3.3v but it seems it has four 12v rails but under those it says 18v?

As you can see I do not fully understand how it all works and any help would be gratefully received.

Cheers,

Chris.

The OCZ 700W GameXstream has four 12v rails (+12V1(18A), +12V2(18A), +12V3(18A), +12V4(18A)) with each one having an 18A rating and a total Max Wattage rating of 525W. Taking 525W divided by 12 we are left with 43.75Amps across the +12V rails. So the GameXstream 700W PSU has 43.75Amps across the +12V rail. I've used this PSU in my Personal system since the article was posted and it's done fine for me with my Intel Core 2 Duo system.

To answer your question this power supply exceeds the requirement for a pair of 7950 GX2. In closing keep in mind that the NVIDIA G80 is rumored to be a power house and comes out in less than a month.

oh and welcome to the forums... hope you stick around.

takeiteasy wrote: I am thinking of purchasing OCZ's GameXStream 700W.

I want to use two XFX GeForce 7950 GX2 in SLI and the instructions say that for two in SLI there should be a minimum 650W PSU with 12v current rating of 34A.

The GX2 doesn't draw near the power of 2 separate cards so the requirements aren't as steep. See here:
http://www.gamepc.com/labs/view_content ... gx2&page=6

I'm not sure about your other ?'s

from what I have seen GameXstreams are powerhouses themselves. But like Apop said go with the 700W or more. If you do plan to go to either G80 or R600, you might want to invest in a beefier PSU.

Like Apop said, welcome, and check out or Folding Section to help out a worthy cause.

Hi all,

Thanks for the replies, just to note, I already have a GX2 and was thinking of getting another to SLI with rather than getting a new, different, card altogether.

A new motherboard, chip and DDR2 memory will be next to look at as time permits, which I don't seem to have much of these days ....

Thanks for the help, I shall go ahead with the purchase of the OCZ GameXStream 700W now I think!

Many Thanks!

Cheers,

Chris.

WinXP Pro SP2
AMD Athlon64 3700+
Abit AN8 Ultra Motherboard
1GB DDR400 Corsair TwinX 2-2-2-5 XMS Low Latency
XFX GeForce 7950 GX2 1GB DDR3 2 GPU's
Latest NVIDIA drivers
Creative Audigy2 ZS
120GB Seagate Barracuda SATA
160GB Seagate Barracuda SATA <DOH!>
Enermax Noisetaker 420W - (Not quite up to the job!)
DirectX 9.0c

yup it's safe.