Some questions about upgrading components

[Oleonius]

Hi,

After Christmas, I plan to upgrade my GPU for a GTX 780 (I actually have a GTX 570) and replace my old Coolermaster Hyper 212+ heatsink for a Corsair H75 (I'm not sure yet). I want it to overclock my CPU, a Core i5 2500K, in order to avoid buying a new CPU and a new motherboard.

1. What is the best non-reference design card for the GTX 780 ?

2. Is there a better heatsink than the H75 that could fit in a Coolermaster HAF 922 ?

3. What frequence could I get with my CPU if I replace my Hyper 212+ ?

Finally, just one question out of the topic: will my ASUS P8P67 Pro motherboard will accept Corsair Vengeance Pro memory ? I know it sounds stupid, but I read in their product description that they are made for 3th and 4th generation Core processor.

Thanks !

 

[Nuclear101]

The best GTX 780 currently is the MSi GTX 780 Lightning, it's MASSIVE but is super fast and cool. Yes, the Corsair H100i is much better at cooling and will fit. With my Corsair H60, I could get 4.7GHz, so you can expect almost 5GHz. I will recommend switching out to a better motherboard though.