I don't really know much about i5s (I've always gotten i7s), but CPU tech hasn't really improved drastically in the last few years, so I'd say @daze23 is probably right. Most games are GPU heavy anyway, so getting a better GPU might be the way to go@Ciggavelli worth it to go from a i5 2500k to i5 6600k? .. doing this tho would mean a new motherboard. I can get a motherboard (Gigabyte GA-Z97X-Gaming 7 LGA 1150 ATX Intel Motherboard) with the i5 6600k for about $320 after rebates. is that a good deal?
i will be keeping my current radeon r7 series graphics card.