This card is just amazing, upgraded from a GTX 470 that I had overclocked to 800 core and 2000 memory (making it run about the same as a GTX 480/GTX 570) but generating 90 degree heat during load in a very well cooled case. Anyway, I got a great deal on this card during a 1 day rebate offer (strange, I know) and after selling my 470 the upgrade cost me about $90. Well worth it!
This card runs at 30 degrees while idle in my system, under load around 50 degrees, full overvolted and stress tested around 60 degrees, what a difference from my old GTX 470! This MSI card also has a lot better cooler solution than my reference GTX 470 had.
Performance wise, using the Heaven benchmark as the easiest way to show the differences:
2560X1440 4X AA with Tesselation on
-My overclocked GTX 470, was giving me 27.4 FPS and a score of 691
-The GTX 560 448 at clock speeds gave me 27.2 FPS and a score of 685 (which is what I expected, so my overclock was about equal to this stock settings)
-The GTX 560 448 overclocked with no voltage changes (850 core, 2100 memory, amazing) gave me 30.1 FPS and 759 score
-The GTX 560 448 overclocked with max core voltage and +30 memory voltage (950 core, 2200 memory speeds) gave me 32.7 FPS and score of 824
-The GTX 560 448 overclocked with all voltages set to max (really just added Aux voltage increase), I was able to run stable at 1000 core speed (insane) and 2200 memory (just couldn't get over that limit without artifacts and even if there were no artifacts it made a very marginal difference in FPS), this gave me 33.6 FPS and score of 847.
This card is the best performer for the money out there, and when super overclocked can compete with a GTX 580, and with a no over voltage tweak can easily outgun a stock GTX 570. For anyone like me with an older GTX 470 that hated the crazy heat and didn't want to spend a lot on an upgrade yet, this is a great option. SLI would be great but I will trade up again next year to the GTX 670 instead. I run my monitor at 2560X1440 and this card has no problem running all the games I play smoothly, skyrim which I just started playing gets 40-60 FPS, minimums I see is 40 fps.