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Hey guys.
So next week I will be ordering the first of 2 GTX 570s with the second coming in August. My worry is however that my current PSU may not be able to hold up. I did some googling and got some conflicting information.
Current Specs:
Intel Core i7 2600k @ 4GHz
Gigabyte P67UD4
4GB Kingston Hyper X
ATi 4850 512mb OC
500GB HD (Upgrading to 2TB in August)
Bog standard DVD drive.
Few red LEDs
Coolermaster GX750W PSU.
So in the googling some were claiming that 750W PSUs were fine while others were saying that it would be needed to go for 850 to 1kW.
Will I need to replace my PSU in august before I buy the second card? The PSU is about a month old by the way so it definitely still is at peak performance.
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I wouldn't expect it to be an issue, I'm running OCed 460 SLI off a Corsair TX650, no sweat, in an i7 930 build. I'm fairly sure your rig will run more efficient, and you have more PSU.
Edit: This Antec PSU calculator can tell you for sure.
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EVGA says their cards need 38 amps to run, which is a lot, but review sites seem to run SLI setups on PSUs that don't meet that requirement, hence the confusion. For example, Techreport ran a SLI benchmark on a PSU similar to yours (60 amps).
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38a isn't for the card, it's for the entire system.
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http://guru3d.com/article/geforce-gtx-570-sli-review/13
this article explains what you would need.
This is what they recommend.
GeForce GTX 570
On your average system the card requires you to have a 600 Watt power supply unit.
GeForce GTX 570 in 2-way SLI
A second card requires you to add another ~225 Watts. You need a 750+ Watt power supply unit if you use it in a high-end system (800+ to a KiloWatt is recommended if you plan on any overclocking).
so, pretty much a high quality 750 or 800 would be suitable.
Personally; i would never buy a CM PSU.
garbage (to me)
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Try hard to avoid getting crossfire / SLI. SC2 doesn't even support it, most game don't. Always best to buy a single card - no overheating issue
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On March 31 2011 05:32 Reno(TE) wrote:
Try hard to avoid getting crossfire / SLI. SC2 doesn't even support it, most game don't. Always best to buy a single card - no overheating issue
SC2 also needs a lot less than a 570, so I doubt he only intends to play SC2. You can actually create an SLI profile yourself for any game that doesn't currently have one, although it won't be optimized as well as if it's with a driver release.
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On March 31 2011 05:41 JingleHell wrote:Show nested quote +On March 31 2011 05:32 Reno(TE) wrote:
Try hard to avoid getting crossfire / SLI. SC2 doesn't even support it, most game don't. Always best to buy a single card - no overheating issue SC2 also needs a lot less than a 570, so I doubt he only intends to play SC2. You can actually create an SLI profile yourself for any game that doesn't currently have one, although it won't be optimized as well as if it's with a driver release.
Guys, stop going off topic, the op is asking power supply related questions; not advice on what gpu or gpu's he should or shouldnt get get 
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ive got an xfx black edition 850watt, i think its a great psu. not the same quality as something like the ax850 or seasonic x-850, but a fair bit cheaper 
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On March 31 2011 14:26 Legatus Lanius wrote:ive got an xfx black edition 850watt, i think its a great psu. not the same quality as something like the ax850 or seasonic x-850, but a fair bit cheaper
Actually, XFX Black Edition is pretty close to Corsair AX and Seasonic X-Series (AX is internally Seasonic X-series). It has just a couple percentage points less efficiency and just a little worse ripple suppression, but it has tighter voltage regulation and little better transient loading results for the +12V rail.
Seriously, a good 750W unit is enough.
GTX 570 power consumption:
http://www.xbitlabs.com/articles/video/display/geforce-gtx-570_4.html#sect0
There's no way you're going to draw over 150W with a i7-2600k. For reference, stock power draw is somewhat under 95W--the TDP is listed as 95W, but that accounts for heat produced by the IGP you're not using. The motherboard, RAM, hard drives, fans, etc. are well well under 100W. So you'd be well under 750W draw from max synthetic load for SLI GTX 570 (stock voltages/frequencies) and overclocked i7-2600k. Only if you plan to volt mod and push the GTX 570 to high overclocks and then run high benchmarking loads would you really need to be looking at 800W or more. Even if you overclock the SLI GTX 570 a healthy amount, you'd be okay on a good 750W unit at normal gaming loads.
Power supply calculators always give inflated results. Obviously PSU manufacturers are going to want you to buy their more expensive products.
Corsair TX750 V2 is pretty good:
http://www.ebuyer.com/product/257233
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I'm sure many people have told you that wattage itself is not the main factor of a PSU.
Something about 12V rail or something like that.
But for example, a good Seasonic/PC Power and Cooling PSU that is say 400W will most definitely beat out say an OCZ 1000W PSU.
Just make sure the stuff is quality, made from a good company and preferably China/Taiwan made. The low to mid-range Corsair PSUs were looking really good for a while until they moved their production to Sri Lanka and RMA requests went through the roof.
Their higher end PSUs are still Taiwanese made though I believe.
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EPT
