For use of an i7 with general gaming and online browsing you are wasting your money, if you plan on 3D modeling and hardcore game development you're looking in the wrong section for performance, that would be GPU, for video encoding you would want the robust processing performance of the i7 or an FX by AMD both are equally matched for encoding capability. In my opinion you can OC an i5 to higher clocks and retain the lower heat generation, but the FX 8-core of mine, (FX-8320) i have liquid cooled at 5Ghz with a peak of 60C and a low of 23C. 1.4875VDC on the CPU and hardly any heat build up,. The i7 would turn your room into a sauna after an hour at 5Ghz over clocking.
i3 = Great platform for mid range laptops and introductory desktops
i5 = perfect for anything shy of data crunching
i7 = The Hollywood of Intel (cuz its for encoding... get it?... nvm)
The old adage that AMD is a nuclear heat producer is true, to the ways of the old, like the old Phenom and Athlon series, i had a Phenom II 985 BE that i OC to 4.2Ghz easily cooled it on air, under the highest loads it never broke 48C, and the new FX series i only ever got to break 70C after over volting it for 5.5Ghz and that was WITHOUT a bus clock modification, just the multiplier. So yeah, it heated up, and fast!
CTurbo :
Who would want a wimpy 12 core cpu when you could get a 15 core monster!!!
http://ark.intel.com/products/75258/Intel-Xeon-Processor-E7-8890-v2-37_5M-Cache-2_80-GHz
Thank you for not being a peasant of Intel and claiming it to be a 30 core. HyperThreading only gives me Hypertension when people think it means REAL cores.