I'm currently using a q9400 and it runs shadow of Mordor with 660 ti on high settings at a decent 55 fps @ 1080p. But in gta 5, it bottlenecks my GPU; on the sea, coastal, and desert areas I get a decent 45-50 fps but in the city it drops to as low as 7 fps!my mobo is a shitty overclocker so I only got my cpu to 2.77 ghz stable overclock. My recommendation, go for the q9650. It comes with an unlocked multiplier and can still kickass in modern games, also because of its bigger l2 cache, your looking at a standard 15-20% increase in fps across the board compared with the q9400; makes it worth putting in that extra 50 bucks. Good luck with the decision