Not that i can add much, but i can say there should be a difference. I mean honestly i would think there would be, its a complete different architecture. I'm in a similar boat, i have the Intel Core 2 extreme qx6850 OC'd at 3.5ghz. But i plan to just go straight to the 3930k which i feel confident is a big bump over say if i got the 2500k, i believe that in order for me to upgrade i gotta have more then 4 cores. Eventually games will utilize the extra cores and threads. If i were you, and price is an issue why not just get the 2500k. It does everything, and you can overclock if it be that day you want get extra frames out of it, it will OC no problem. Just my opinion though.