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850w or more for SLI 580 and benching

post #1 of 25
Thread Starter 
I'm picking up SLI 580's, and for the mean time I'm going to use my hx650 for the 580's and my SSD/HDD and my corsair 400cx for the 24 pin + 8 pin. I won't be pushing that setup really, because I don't want to blow anything.

However for my permanent solution, what wattage PSU should I be looking into? The most I've seen SLI 580's pull seems to be 850w in furmark. I won't be running furmark, but I will be gaming and OC'ing the entire rig (sig) + a mild OC on the 580's.

Once I save up to get a benching platform, probably 2600k + p67a, I will want to use the PSU + 580's to push.

Am I looking at 1kw minimum here?

Dual rail, or single rail? I can get a hx1000 for relatively cheap and would prefer that, but it's dual rail 2x 12v 40a. I'd much prefer the ax1200 single rail 12v 100a but I can't afford that, so it's out of the question.

Needs to be modular. Would LOVE modular 24 pin too, like ax1200.
Edited by fl0w3n - 3/6/11 at 11:50am
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post #2 of 25
Technically and so long as you don't do any benching/folding/stress testing, GTX 580 SLI should run on your HX650 without needing the CX400 thrown in there. That'll hold you until you can get a new PSU -- and a 850W will do great.
If you want a fully modular PSU, then you have precious few options:
- Corsair AX850 / SeaSonic X850 (same unit, Corsair has a longer warranty)
- Silverstone Strider Plus 850W and Strider Gold 850W
post #3 of 25
irrespective of how many rails a psu has a good psu is a good psu

and 850 is fine for sli 580's you only looking higher then that if you gonna be running an extensive water loop an extreme clocks

and the 850 watt figure wat likely taken at the wall wich does not factor in efficiency say the psu was 80% efficient which means only 680 watts was drawn from the psu

whats your budget for the psu?
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post #4 of 25
Thread Starter 
Quote:
Originally Posted by Shub View Post
Technically and so long as you don't do any benching/folding/stress testing, GTX 580 SLI should run on your HX650 without needing the CX400 thrown in there. That'll hold you until you can get a new PSU -- and a 850W will do great.
If you want a fully modular PSU, then you have precious few options:
- Corsair AX850 / SeaSonic X850 (same unit, Corsair has a longer warranty)
- Silverstone Strider Plus 850W and Strider Gold 850W


I would really rather not use 95% of my PSU's capacity.

Quote:
Originally Posted by obsidian86 View Post
irrespective of how many rails a psu has a good psu is a good psu

and 850 is fine for sli 580's you only looking higher then that if you gonna be running an extensive water loop an extreme clocks

and the 850 watt figure wat likely taken at the wall wich does not factor in efficiency say the psu was 80% efficient which means only 680 watts was drawn from the psu

whats your budget for the psu?

Well since I have the choice now, I want what is better. I am no doubt going with a high quality PSU either way, but I want the better choice between the high qualities.
I've heard single rail is better for over clocking, and I've also heard dual rail is better for multi GPU.


Although I will never run furmark because there is no point, I would never want to accidentally push to the limits of my PSU.





I am looking at below $200. I can get a brand new never opened HX1000 for ~$150 and a used HX850 for $120

If the dual rail statement about SLI is true, then I will go with the HX1000 if I can still get it.

I would REALLY like modular 24 pin though, I guess beggars can't be choosers...
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post #5 of 25
Thread Starter 
I've got my eyes on this Silverstone, because it seems to fit my requirements.

http://www.newegg.com/Product/Produc...82E16817256057
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post #6 of 25
Anandtech posts power measurements taken at the wall, i.e. for the whole system, not including efficiency. In other words, 620W at the wall = 527W drawn from the PSU assuming it's 85% efficient. That's not 95% of your PSU's capacity. And even if it was, it would be fine, the HX650 can handle it easily.
post #7 of 25
Thread Starter 
Quote:
Originally Posted by Shub View Post
Anandtech posts power measurements taken at the wall, i.e. for the whole system, not including efficiency. In other words, 620W at the wall = 527W drawn from the PSU assuming it's 85% efficient. That's not 95% of your PSU's capacity. And even if it was, it would be fine, the HX650 can handle it easily.
Yeah I usually assume all graphs like that are wall measurements unless otherwise stated.
With that being said, I did forget about the efficiency factor.

However, for all intensive purposes I will be pulling more power than the Anand system. Higher clocked CPU (he runs his at 3.3, mine will be ~4.2) extra hard drive, extra dvd drive, higher clocked ram (more volts), and nicely clocked 580s (nothing extreme for 24/7 because they will dominate everything already)
Anand doesn't state his PSU, but lets assume minimum 80% efficiency and that means 722w COULD be drawn from my PSU with everything stock (none of my OC) and I really, really don't want to find out what would happen if my system asked for 722w out of my 650w psu.
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post #8 of 25
Well you do need a 850W PSU ideally. My point was that for right now you don't need the CX400 thrown in there.
But if you were drawing too much from the PSU, the worst that would happen is it would shut down harmlessly.
post #9 of 25
silverstone is the business there but you might wanna look at this if you near microcenter

http://www.microcenter.com/single_pr...uct_id=0335251
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post #10 of 25
http://www.jonnyguru.com/forums/showthread.php?t=3990

There is a good read about single vs multiple rail psu's.

It's not that either one is exactly better, just you have more safety with a multi rail psu if it's quality.
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