Barely any difference at all for gaming. Both are quad core, the main difference is it adds hyperthreading, which sort of gives you four extra virtual cores, so task manager will show eight CPUs for an i7. If you do some hefty processing stuff like video editing or raw image editing, stuff that taxes the CPU with pro software that supports hyperthreading, then an i7 is worth it. For gaming? No.Hey question - friend of mine's saying that I should be dropping an i7 in instead of an i5, is there much of a difference in speed there? they're both quad cores right?