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8800GTX and OCZ GameXtreme 700w

post #1 of 27
Thread Starter 
Hi

Please can someone help me on this, as you can see from my rig below, I run 2 8800GTX on a OCZ 700w PSU, now, I have many saying that this is fine, and I selected it with lots of suggestions from other users. However, I am now getting many tell me that my PSU is not enough.

Now, I have not had any problems, but I just want to be sure that this PSU is fine and that I dont need to replace a 3 day old, £100 PSU!

Any help please?
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post #2 of 27
I use this to determine my load and needed wattage.
http://www.extreme.outervision.com/psucalculator.jsp
I think it gives the voltage a little high but not too much.
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post #3 of 27
It might be fine while running at stock... but if you overclock them along with your QX6700, your most likely going to be having stability/power problems when running demanding games or benchmarking in 3DMark.

Quote:
Originally Posted by BRISKbaby View Post
I use this to determine my load and needed wattage.
http://www.extreme.outervision.com/psucalculator.jsp
I think it gives the voltage a little high but not too much.
That isn't accurate at all.. I used it before and it said I needed like 580W while it said somebody with dual 7800GTX only needs like 510W.
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post #4 of 27
Quote:
Originally Posted by JacKz5o View Post
It might be fine while running at stock... but if you overclock them along with your QX6700, your most likely going to be having stability/power problems when running demanding games or benchmarking in 3DMark.



That isn't accurate at all.. I used it before and it said I needed like 580W.
I think you're right. It's changed. It gave mine accurately a while ago. Now I have to do it by hand again. Sorry, ignore previous post/site.
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post #5 of 27
It's a little light for the set up. I think fine at stock, but as soon you start serious overclocking, there might be issues.

I put your rig into this PSU calculator, and with just the CPU (overclocked @3.33GHz, assuming 1.4V), the GPUs, the hard drives, and an optical drive, I already exceed 700W.

Also, nVidia recommends 800W or more for SLI 8800GTX's.

Do yourself a favor: since the PSU is new, you likely still can exchange it for a more powerful one.

The calculator still is a decent guideline, although it's always an estimate.

700W with 50A is not enough... that's my opinion. Replace the PSU
    
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post #6 of 27
That PSU should be fine at stock with SLI cards...Even then though i have a feeling you may be pushing it a little. You may wish to Invest in a Single one of these and have one card on it to releive stress on your main one :

GPU PSU THREAD OF MINE : http://www.overclock.net/power-suppl...d-gpu-psu.html
post #7 of 27
Enterprise's solution is good also. Add a dedicated PSU for one of the video cards, and hook the rest up to the GameXStream

This is my recommendation for a full blown rig like yours:
850W Silverstone SST-ST85ZF Quad +12V rail, Quad PCI-E, ATX 12V 2.2 & EPS12V, RoHS £163.33 Inc VAT

That'll run your rig easily (ask K|ngP|n and his world record 3DMark06 score..)
    
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post #8 of 27
Thread Starter 
Hehe, I did use that before, it says I need 1350w! Hmm, little high I think....

But I am not OCing the video cards at all, just OCing the CPU right? Not changing voltages atm as I dont know enough.

How can I tell if the PSU is too small? Is there a test I can run on my system to find out? Thing is, I have not noticed anything at all that makes me think something is not right. I am able to run huge 3dmark06 scores and just want to understand more, I have always gone by the saying that if its not broke, dont fix it. As it will cost me at least £150 to fix this, I really want to know if I have to, not just cos they say 750w min. Also, if they say 750w min, 700w is not far off, surely if they say you need 750w, they are allowing for 2 Optical Drives, Floppy Drives, Up to 4 Memory Sticks, Ect. So if I am running GPU @ stock, CPU @ stock voltages but higher FSB/Multi, 1 Optical, No Floppy that 700w will be enough?

I know I seem like I am going over this enough, but I would like to know what are the signs that the PSU is too small?


EDIT=Thanks for the info =)
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post #9 of 27
The sign that it is too small is easy: your rig will shutdown or reboot spontaneously, or otherwise show instability (likely shutdown/reboot though).

I'd contact the vendor and see if you can replace it. Or add the dedicated one Enterprise suggested.

Right now you don't overclock yet, but you will... and 700W is light for stock. Also, do realize that your PSU will age and then deliver a bit less power... that's when trouble might hit, even though you're fine now.
    
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post #10 of 27
Thread Starter 
Also, if I did change it, what should I be looking at that will keep me going for a while? 850w or 1kw?
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1TB WD Black, 500GB Barracuda and 250GB WD Windows 7 Ultimate iiyama E2473HDS 24" LED + 22" Samsung 225bw WS Logitech G15 
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Silverstone 850w Thermaltake Armor LCS Razer Naga 
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Home PC
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CPUMotherboardGraphicsRAM
i5 2500k Asus P8P67 Pro R3 Radeon HD 5850 8GB G Skill 1600mhz DDR3 
Hard DriveOSMonitorKeyboard
1TB WD Black, 500GB Barracuda and 250GB WD Windows 7 Ultimate iiyama E2473HDS 24" LED + 22" Samsung 225bw WS Logitech G15 
PowerCaseMouse
Silverstone 850w Thermaltake Armor LCS Razer Naga 
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