Hey I have GTX 560 Ti as well, but on PCIe 2.1x16 slot. What kind of performance are you getting? Any benchmarks? I might tell you how much difference there is.
Overclocking generally increases temperatures, and excessive temperatures lower the lifetime of the card. However, if you have decent cooling (MSI twin frozr II for example, it's one of the best GPU coolers), you should worry about it too much. Of course, watching over temps when overclocking is a must.
My full load temps are around 55-60 so i dont think temp would be a problem
I get a score of about 1033 on ungine heaven benchmark 2.5. With the default settings it gave me so... um
full screen on
Thank you for your help so far