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PSU for Gtx 580 maybe SLI

post #1 of 12
Thread Starter 
Hey guys,

Saw a really nice post on these forums about the Corsair 850HX for SLI 580.
In there I found that 850-900+ should be plenty for running SLI 580's. But it didnt quite convince me.

People talk alot about ''do you OC'' when it comes to PSU. Well my plan is to get MSI twin Frozr II 580, which I guess you can consider an OC ?

Anyway, the website I use to build my rig tells me that in order to run gtx 580 SLI you need dual 12 volt rail with enough amps. If I would trust their intel it would come down to only like 4 viable PSU's. I self dont trust this cuz this would exclude almost every single corsair PSU for SLI gtx 580.

Ill prolly be looking at this:
CPU: Maybe i7 3820 which is 130 watts.
1 HDD
1 SSD
1 Diskdrive
2 Gtx 580s

But basicly I see alot of the PSU's are SLI ready but they dont all have two 12 volt rails, which is needed to run GTX 580 SLI apparantly and this is confusing me. Biggest problem is I will start with single 580 and dont want to find myself having to buy a new PSU along with a GTX 580 when I already wasted money on a high Watt PSU for SLI in the first place.

It turned into abit of a mess but I hope someone could clarify.
post #2 of 12
Ax850
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post #3 of 12
Thread Starter 
Ax instead of Hx just gives full cable management ? Not sure that is what I was looking for.
post #4 of 12
A quality 850w will work fine, the ax850 is a quiality PSU but there is other's that's a little cheaper that will also do the trick like the XFX core/pro editions, Corsair TX850 V2 and the antec tp-850.
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post #5 of 12
Okay, first off, the whole double 12V 'rail' being 'needed' is absolute nonsense and garbage. You were right to be skeptical.

For all intents and purposes with the set-up you're considering here, you need not concern yourself w/the count of 12V+ rails AT ALL. Pick the PSU you want for all the other reasons, and whatever it's rail config is, it's going to be 100% fine (unless you choose the old Corsair HX1000 though, that's the one exception ... if you do, you'll need to do some research to discover the proper way to run the cables to the cards)

When people ask about OC'ing w/regards to PSU, its less about the actual OC'ing, and more about the Over-Volting (OV) that people often do to get higher OC's. Bumping the clocks doesn't do much to the power draw by itself, but when you OV+OC, that can kick the juice requirements up pretty good.

The AX-line isn't just better cable management, it's a higher-end unit internally, with a bit better efficiency (which just saves on your power bill ... being more efficient in and of itself doesn't mean it provides cleaner power or anything) than the HX/TX lines.

A good, quality 850W unit will be fine for running 2xGTX580's pretty much no matter what you do with OC/OV'ing both them, and the CPU. Well, short of perhaps a doing a physical volt mod to jack the voltage WAY up, and running your CPU/GPU under LN2 trying to break world records ... in that case, you'd want a 1000W unit.

What is your price range, and what are the other features you're looking for in the PSU aside from 850W ... prioritize in that regard, and we'll help you find the right one. What country do you live in, BTW, (or what site do you plan to buy from) so we can target to what's actually available there.
    
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post #6 of 12
Thread Starter 
That basicly answers everything I needed to know, Thnx alot.

But ye I was aiming at a PSU between 100-160 ish euros, and prolly only be OCing my CPU in the future.
post #7 of 12
Consider that my total system load was 370w with one gtx480 (measured with UPS from the wall with nothing plugged in but pc. Both cpu and gpu ocd and in full load running BC2). I haven't measured how much it is with 2x gtx480s but im sure I have room to spare (and my cards are more power hungry than your 580s).
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post #8 of 12
Two 480's in SLI are a bit different of a story. With hefty OV/OC on both the cards (like say 850c/1.1V) and on the CPU, if you start running a CPU stress test like Prime 95 and a GPU stress test like Furmark, both at the same time ... you can actually start to get near the capacity of an 850W unit. It probably won't shut off, but you could def. see the 12V circuit getting stressed and the voltage dipping well under 12V.

I know this, because I used to have SLI 480's, and an 850W PSU.

@Doubleome: Is there a site you prefer to buy from, or will you be buying it at the shops? We can help you find the best deal if you can point us at the site.
Edited by brettjv - 7/28/11 at 9:40am
    
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post #9 of 12
Quote:
Originally Posted by Doubleome View Post
Hey guys,

Saw a really nice post on these forums about the Corsair 850HX for SLI 580.
In there I found that 850-900+ should be plenty for running SLI 580's. But it didnt quite convince me.

People talk alot about ''do you OC'' when it comes to PSU. Well my plan is to get MSI twin Frozr II 580, which I guess you can consider an OC ?

Anyway, the website I use to build my rig tells me that in order to run gtx 580 SLI you need dual 12 volt rail with enough amps. If I would trust their intel it would come down to only like 4 viable PSU's. I self dont trust this cuz this would exclude almost every single corsair PSU for SLI gtx 580.

Ill prolly be looking at this:
CPU: Maybe i7 3820 which is 130 watts.
1 HDD
1 SSD
1 Diskdrive
2 Gtx 580s

But basicly I see alot of the PSU's are SLI ready but they dont all have two 12 volt rails, which is needed to run GTX 580 SLI apparantly and this is confusing me. Biggest problem is I will start with single 580 and dont want to find myself having to buy a new PSU along with a GTX 580 when I already wasted money on a high Watt PSU for SLI in the first place.

It turned into abit of a mess but I hope someone could clarify.
Go with seasonic x850/corsair ax850
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post #10 of 12
Thread Starter 
I live in Holland and I have two shops there were I buy from. But usually I just check benchmarks, reviews and forums to see what would be a better choice. Then check what they have avaible.

But basicly everything found on Newegg is pretty much similairly priced as it is here.

And ehm my friend is also building a PC pretty much the same as mine(i5 2500k - SLI gtx 580 etc) but found a deal with a coolermaster case + power supply which is a 700 watt. Which im guessing should be fine but prolly wont be as efficient. Its a Coolermaster Silent Pro M 700W.
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