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560 Ti SLI PSU requirement

post #1 of 6
Thread Starter 
So I'm wondering whether to buy

A) Asus GTX 560 Ti DCII SLI setup or
B) Asus GTX 580 DCII single card

My PSU is Corsair HX-750W so I'm wondering whether it would be enough to power the 560's. I'm probably not gonna OC them much, but if I get the 580 I'm gonna OC it as much as possible. Will my power be enough for set up A and/or setup B?
post #2 of 6
That PSU will be fine for both setups, personally I'd go with the 560s
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post #3 of 6
Im running a single 560ti on a crappy coolermaster 450w so yeh 750 is more than enough for 2.
post #4 of 6
That PSU should be more than enough for either option, should be just about enough for 580 SLI as well. That question is better asked in the PSU section if you think you might be close to the limit as may be the case for possible 580 SLI, but for 560ti SLI or a single 580 that is more than enough.

What are the prices for the two options where you are located? The 580 is slower than SLI 560tis but not by a huge margin, and it does have the benefit of additional VRAM and is only a single GPU which is preferred. The VRAM is not a huge consideration at only 1080P but it is still a benefit in maxing out newer games like Crysis 2 or Battlefield 3. Additionally in future games or even today's games with high-res texture packs or other mods you will appreciate having 1.5Gb of VRAM. A single GPU is preferred over a SLI setup because not all games scale perfectly, and there are some headaches present in dual GPU setups that are not in single GPU setups, single GPUs tend to just work as expected more often. But the real choice IMO would be made by how much more expensive a good SLI 560tis set up would be over a good 580 and what games you play, i.e. if you would actually need the additional GPU processing power the 560tis in SLI would provide without being constrained by their VRAM.
Edited by juano - 10/2/11 at 5:18am
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post #5 of 6
Thread Starter 
Both options cost about the same here (~450€). I like to play RPG games like Witcher 2 and the upcoming Skyrim. Apparently 560Ti SLI seems to score 7200 in 3DMark11 which is the same as Asus 580 DCII overclocked to the maximum.

So maybe the "wiser" choice would be the 580 which would have no SLI problems, less power consumption, less noise and easier upgrade. But as I might not have the money to upgrade anytime soon I would get more power from two 560's overclocked. They seem to score about 8200 with high overclock. Just not sure if my PSU would handle that. And yeah the PSU board would probably have been a little better suited for my question...
post #6 of 6
750 watt is more than enough for SLI 560ti, you can check in the PSU section (specifically in Phaedrus quick and dirty PSU calculator which is stickied at the top) but even though I'm no PSU expert I can tell you a decent 750w, which the HX-750 is, will have no problem with SLI 560Tis.

As for your games, Witcher 2 is a very tough game to max out, so it would take all the GPU power you could throw at it, I'm not sure how much VRAM it requires but I don't think it would require more than 1Gb at 1080p, so we'll call that game in favor of 560ti. Skyrim on the other hand shouldn't be incredibly stressful to max out in terms of GPU processing power, but additional VRAM would be a boon when it came to modding Skyrim. There is a big modding community for the Elder Scrolls games, and there are a lot of cool things that can be done with those mods, and almost all of them require more VRAM, so I would call that game in favor of the 580.

While it's true that it is difficult to consider getting the money for another 580 for SLI if you ever deem it necessary in the future, a single 580 is no slouch as it stands currently so you may find that it is powerful enough on its own. IMO the extra GPU processing power offered by the 560ti is not large enough to be a game changer in it's self, you would likely only see 10% more performance than a 580 IMO when everything is working well. This review is kinda old, but should still be relevant because as far as I know there haven't been any huge driver increases for one option but not the other, so the ~10% difference you see here is representative of what you could expect. What you can't see there is the difference that the extra VRAM would make in games with high res texture packs, or just more stressful games of the future in general.

I think I personally would go with the 580, as evidenced by my GPU, but either option is a good choice IMO. I just wouldn't get the Asus DCII if you went for 560tis, as I don't really like the cooler on those cards, I would go with the MSI TFIII Hawk for 560tis. For 580s, the Asus is a great card and is very very quiet, but the MSI Lightning should have a better chance of a high OC on average while being just a bit louder.
Edited by juano - 10/2/11 at 5:49am
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