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Stop recommending 650W-850W power supplies for single card systems - Page 11  

post #101 of 286
Phaedrus I hope you don't think this off topic question is derailing your thread but I have been curious about this for a little while but didn't feel it warranted it's own thread.

What do you think about my X750 running my SB at about 1.34v (so maybe 4.6-4.8) and 2 GTX 580 Lightnings at about 1.15v (which is about a 100mV overvolt and clocks around 900-950MHz tops), other info is 2 HDDs 3x120mm 2x 180mm and 1x 140mm fans, and would be folding 24/7 on both GPUs and the CPU. Basically from the handful of people that I've asked around here whose opinions I trust and consider to be experts, I've had about half tell me that it would do it safely, and the other half tell me it would do it but it would be far from ideal.

I'm no expert of course but I'm kinda torn because the CPU is a power miser, and the Lightnings draw no more or even slightly less than a standard 580, (this HardOCP review shows draw for a single Lightning with a 150mV overvolt which is the most I would do) but then again I'd be folding 24/7 OC'd on all three.

I think what I would probably do is wait till the new X860 platinum goes on a sale, even just a little bit, and then pick that up since that would be the ideal power amount for that rig.

Thanks in advance for your advice.
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post #102 of 286
i did a few psu calculators and they say i need 1100-1150 watts.
    
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post #103 of 286
    
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post #104 of 286
the difference between the 650w unit and the 850w was negligible to me, so I bought it. Though I know it's overkill even for sli.
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post #105 of 286
Quote:
Originally Posted by thisizbrian View Post
i did a few psu calculators and they say i need 1100-1150 watts.
That's because you have a pay per minute account with your electric company when your system in powered on. 289w x2 + 160w processor. You need 750w just to boot. I bet the lights go dim in the rest of the house when you are gaming!
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post #106 of 286
First, this thread should be in the rants section.

Second, I completely agree. A 750W psu powers my rig perfectly fine even when overclocking my i7 past 4.0 and gaming.
    
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post #107 of 286
Quote:
Originally Posted by thisizbrian View Post
i did a few psu calculators and they say i need 1100-1150 watts.
The psu calculator I used says I need about 575 watts for my sig rig, which to me sound about right.
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post #108 of 286
Quote:
Originally Posted by dixson01974 View Post
The psu calculator I used says I need about 575 watts for my sig rig, which to me sound about right.
i realized that some of the calcs represent numbers if you maxed everything out.

the antec one is an exception as it calculates for continuously available power (not peak power).

http://www.antec.outervision.com/

on this one i only needed about 850watts.

with that being said i had an 850 watt psu and it wasnt enough and died when i maxed my GPU's.
    
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Hard DriveOptical DriveOSMonitor
2 x Raptor on RAID 0, 1TB Seagate in IcyDock ext. Pioneer 12x Blu-ray RW Windows 7 x64 3 x Alienware OptX AW2310 in Surround Vision 
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post #109 of 286
Quote:
Originally Posted by dixson01974 View Post
From the wall and on a non-oc rig. 6970CF will draw about 601 watts, so it can handle a three 6970.
looks at title of webpage..... who doesnt overclock here?

that and who with 3 6970s wouldnt overclock lol
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post #110 of 286
I have 10 different P/S's and all but 3 are selected as close as I could get to what I actualy need. My Corsair 750 and 850W came at incredible used prices. Now this 1000w is total bling and one of these days someone is going to come along and see that 1000w and it is going to be just what seals the deal on what I am selling. I view it as something like having a car with 450hp. I will never need a car with 450hp but perhaps I find someone that does want it, in that case it is in my inventory. Now what I need is 5x400W P/S but Corsair decide to do away with my favorite 400W. Trade anyone?
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