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PSU for Q6600 OC'd, SLi 9800gtx

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Is my q6600 bottlenecking my 2 9800 gtx in SLI or is my SLI not set ??

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Ok, I'm in the middle of piecing some parts together and I'm stumped. I currently have the following:

Asus P5N-D Mobo
Q6600 (hoping to push it to 3.2 GHZ)
8GB OCZ Reaper HPC Edition PC2 6400
2x BFG GeForce 9800 GTX (SLi)
2x WD500GB SATA 3.0Gb/s Drives
2x IDE Drives
2x ASUS 20X DVD±R DVD Burners

I did some reading and found that the 8800gtx takes like 330 watts at extreme load which I'm not sure if thats true. However, I really cannot decide on a PSU to support all the hardware along with being OC'd. Currently I'm debating on a Thermaltake 1200W PSU http://www.newegg.com/Product/Prod [...] 6817153054 but I'm thinking it is a little over kill and I don't want to spend that much on a PSU. Any suggestions or recommendations?

TIA

*Edit

According to the PSU calculator its recommending a 757 watt PSU and with it OC'd its recommending a 988 watt PSU. From what I read on here, http://www.extreme.outervision.com/PSUEngine results would be in extreme/rare occurrences. So Maybe a http://www.newegg.com/Product/Prod [...] 6817153043 will work?

Message edited by doublejz on 11-14-2008 at 10:15:09 PM

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I would buy an Antec 850W Signature series PSU.

http://www.newegg.com/Product/Prod [...] 6817371018

Here is the review of this PSU on Jonnyguru.com

http://www.jonnyguru.com/modules.p [...] y&reid=101

It's the best PSU he has ever ranked, and he is the guru.

As you can see on the review, it has 4 12V rails, 2 specifically for the PCI-E connectors that provide 25A on each rail. That should keep your machine super stable.

Reply to serpent1202

i dunno if the 25A 12v rails would make the 8800gtx sli happy. The Thermaltake has 30A which is a slightly noticeable amount more. Hrm, event the 1000W Thermaltake ranked higher then the one you posted (http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=53). So I wouldn't say the antec is the highest ranked one.

Message edited by doublejz on 11-14-2008 at 07:21:46 PM

Reply to doublejz

Even with adding cooling and extra cards on that PSU calculator i only get ~600w i dont know how you got 750w

8800GTX comes in at 231w full load
http://archive.atomicmpc.com.au/fo [...] c=7&t=9354

So at 12v they might use 20amp...

Corsair 620HX would run that rig without a hitch, majoity of the time (idle) it would actually sit in the best efficientcy range for the PSU which means less heat and power wastage. If you want something with a bit more left in the tank a solid 750w would be good. 850-1000w is just overkill, 1000w will run TRI SLIed 280gtx with power left just to give you an idea

Message edited by chookman on 11-14-2008 at 09:56:35 PM

------------------------------ "This thread made me strap on my lolerskates and head for my roflcopter."
Reply to chookman

The PC Power & Cooling 750W is actually certified by nVidia for 8800GTX dual SLI. If you buy it today you pay something like $110 - 15%.
http://www.newegg.com/Product/Prod [...] 20Silencer

Here's the complete list, just make sure you pick the right dropdown from it:
http://www.slizone.com/object/slizone_build_psu.html

There's no way an 8800GTX can take 330W. Even the HD 4870 X2 tops at 270W or something like that IIRC.

Message quoted 1 times

Reply to aevm

haha just realized something. I went with 2 9800gtx cards not 8800gtx.

Message quoted 1 times

Reply to doublejz

aevm wrote :

decent price. Never even heard of that company before.

Reply to doublejz

doublejz wrote :

haha just realized something. I went with 2 9800gtx cards not 8800gtx.

9800GTX's are actually slightly more power efficient than 8800GTX's...

Aevm's suggestion is a good one, only heard good things about PCP&C

Reply to chookman

+1 what chookman said. My personal preference is Corsair. Always had good luck with their psu's.

Currently the Corsair TX750 is available at buy.com for $83.74 and shipping is free:

http://www.buy.com/prod/corsair-75 [...] 78325.html

Reply to JohnnyLucky

Good 500-550w psu would be enough.

------------------------------ intel core 2 quad q6600 @3.2ghz msi p6n diamond (X-FI Extreme sound) 6gig of OCZ+CoRSAIR oc 900mhz Nvidia gtx 260 sli @ 730/1465/1250
Lite-On Blue-ray Western Digital 7200rpm 500gb Antec 500 Earthwatt Window vista 64-bit
Reply to invisik

Definitely go with the PC P&C 750. It's Seasonic built with a single rail at 60A.

$100 after rebate at Newegg.

Reply to Zorg

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