must agree with above, i play total war series of games, had a i5 for a while, tested a few amd chips that i was building for friends etc and they were better in some and same in others i played, but in the end went for a i7 with more ram, same video card and tbh games play much better, more fluid / fps, as games have very large maps and upto 10k of soldiers on map at once, i needed something that could move it all around with a good screen size so it didn't hurt my eyes after more than a few hours of playing, if the game is programmed well HT really works, same a multi thread etc, shame there aren't many good or great programmers out there, but yes it's getting better, Crysis 3 seems to use HT and also makes use of more threads/cores.
all the top end chips are good for gaming, just some are better for some games and score higher than others, while in other tests there not so good, but never by that much that it makes any real difference, so it's down to budget and games you play, what chip you buy, for me this year any 4 core would do, maybe next year 6 or 8 core, but if you have a 6/8 core already, that's fine, but may not be fully used as yet in some games etc