well i bought a AIO watercooling setup from CM, got a X5660 to 4ghz on all cores. temps were higher then i liked but it was solid, lowered the clocks for better temps and sold the rig to a friend. im sure with a good air cooler or better watercooling you might be able too. it does come down to the silicon lottery and amb. temps where your at, load temps are something you need to watch for sure.