Hi, I have Gigabyte GTX560Ti OC
and as stock it has great temps but was very noisy. The heatsink is quite hefty and has 4 heatpipes in it, got potential. It would idle the twin 80mm fans at 1700rpm, at idle with 32°C GPU temps.....
A quick, free, BIOS mod later and then idled fans at 700~800 (I think) but still got loud on load due to agressive fan ramp profile and 3000rpm capable fans.
I then swapped the stock fans for a pair of 80mm 2000rpm Sharkoon "Golfball" fans, these would idle right down ~500rpm, dead quiet and heavy load up in the 1600rpm range, but with great temps and possibilty of trading temp for noise with MSI Afterburner or the like.
I've now got an Arctic Cooling Twin Turbo II on it. This is a large, 5 heatpipe, 92mm twin fan job. Currently card running Folding@home and has been for hours.
GPU-Z reports the GPU temp at a cool 60°C and the fan speed at 810rpm. A pair of good 92mm fans at that speed are very quiet and in all honesty could be dropped to 650~700 and still have reasonable temps.
The Phantom (and Pallit too I guess) will be the quietest stock cards but I suspect my BIOS modded Gigabyte (also cheapest 560 Ti at time) would be comparable and with swapped fans (£10) probably quieter.
With the Twin Turbo on it and BIOS mod it's now under the noise of rest of the PC and I suspect pretty much anyone's PC, that has the power to *need* a GTX 560Ti anyway.
Now if I could just cool the CPU more quietly... but I already have the biggest heatsink that will fit my case. Maybe I need a better case, or less over-clock but 4.5GHz seems like a nice round number