You sure can, you just have to make sure you have enough cooling for the processor. It is 100% up to you if you overclock or not.
i have H2C Ceramic Liquid cooling on both chips.....i just dont know anything about OC.
just read up on the guides tom's has for overclocking because one bad setting could mess up your BIOS beyond repair
All that power and no idea how to get the most from it. Personally I am not sure you should. Though I do know you SHOULD, I just dont know YOU should. At this point, are you missing it? Maybe if we had more specs...
Dual i7 965 extremes-6gb ram-velociraptor 10k hdd-radeon 4870x2 2gig-h2c creamic liquid on both cpus-1000w psu