First of all I'm building a gaming computer that is going to have an HD 6850. I'm going to be playing games like SC2, WoW, CoD, etc. I want to know if getting an i5 2500k rather than an i5 2500 is going to improve the grapchics by a considerable ammount. In my opinion, going for the i5 2500k isn't really worth it because i'm going to have to buy a new heatsink to overclock and it just seems like in the end my gaming experience will be the same. What do you suggest? What is your opinion?
With Sandy Bridge, the BCLK generated on the 6-series PCH is at 100MHz by default and honestly won’t go much higher than that.
While I’ve heard reports of getting as high as 115MHz, I’d view 103—105MHz as the upper limit for what you’re going to get out of BCLK overclocking. In other words: next to nothing. A 105MHz BCLK overclock on a Core i7-2600 will take you from a stock speed of 3.4GHz to a whopping 3.57GHz. The form of overclocking we’ve been using for the past decade is effectively dead on Sandy Bridge.