Re: big difference in gaming between i5 and i7?
If they are identical except the CPU, then go for the i5, (if its cheaper).
If there the same price go for the i7.
CPU doesn't really effect game performance a lot, it is still good to be running a powerful CPU, but if your gonna save money then the i5 is much more value for money than the i7 range.
Intel Core i5 2500K /-\ 32Gb 1600mhz RAM /-\ Asus P8Z68/GEN 3
2x 256Gb Crucial M4 /-\ Crossfire XFX HD Radeon 7950 Black DD
Sound blaster Z /-\ yourpcperfect.com /-\ Windows 7 Pro