Stock Intel, I'm on a core 2 Duo if the coolers are different. I might get a after market cpu cooler after I upgrade, lga775 coolers aren't usually compatible with new mothdrboards like lga1155.
I am pretty sure 99% of coolers are compatible between 775 and 1155, and I am 150% sure that all 1156 coolers will fit 1155. And the V8 is a good cooler, but the V6GT is better.