I'm planning on buying a MSI GTX 560-ti Twin Frozr II/OC which is at 880mhz. But i've read that it's possible to OC them to 900 or more, but since i'm don't know anything about overclocking GPU's i'm wondering if i need an aftermarket cooler like with CPU's or if the stock one is good enough?
I have a Gigabyte GTX 560 Ti SOC Ed. and it comes with a factory overclock of 950Mhz on the core. Though I have yet to need doing so, apparently they it can handle ~1GHz (core clock). At standard fan rates (40-60%) you can barely hear them, at maximum fan speed, there is still very little audible noise; they're quieter than my case fans. This is on account on the custom cooler Gigabyte use, very similar to the Twin Frozr II, so it should be easily sufficient for a little overclocking.
Have you changed the GPU or Memory Voltage at all? Or still set at auto?
Also, 2200 on the Memory....wow. That's almost a 100% increase! I was thinking that when I decide to OC it (probably when BF3 comes out, lol) I'd bring it up to 1GHz on the core, 2GHz Shader and 1.5 Memory - will that require an adjustment of the voltages, or anything other than changing than clock speeds?