Originally Posted by Gregster
SLI is a good option but other things need to be considered.
1. Power - The 560TI 448 has a TDP of 210W so if you times that by 2, that is 420W add in your CPU at 95W that = 515W. Add in a few case fans and a couple of HDDs, that doesn't leave much head room.
2. Heat - When you go SLI, you will be producing a lot more heat and cooling can be hard in even bigger cases. If you are using Ref style coolers though instead of custom coolers, venting heat out the back will help with this.
3. Noise - As you know, when GPUs get hot, the fans spin up faster to keep it cool and I found it quite annoying with 2 GPUs spinning away. I went water cooling in the end purely to lower the noise.
I am not trying to put you off SLI and with all these factors considered, I have not had any problems except for the odd game (Like BF3) not scaling so well with 2*GPUs. SLI works well 90% of the time.
Those are good points that you should also consider.
Put it like this, 560 Ti 448's in SLI can and will play all games currently at highest settings, and probably all of next year's games too. The question is whether or not the 660 Ti performance is good enough for you. If so, I'd recommend going with a 1 card solution and then SLI/CF later when you need the power. Just my 2 cents (but DO check out slickdeals!)
Hmm, looking at anandtech's review of the 660 Ti, it seems to be better than a 7970 (all stock clocks on both):
Although with the 12.1 drivers the 7970 got a much needed boost from AMD which I don't think are reflected in that benchmark, so expect the 7970 to perform equal or better than the 660 Ti. Also consider that the 7970 has a massive overclock headroom, the regular 7970 is 925 MHz, but the card itself can go up to 1200 MHz or higher (33% overclock) so, take that as you will.Edited by AchuSaysBlessYou - 11/18/12 at 3:05pm