Well, I lapped my 6400 with great results, gained another 200MHz stable, and about 8-12c cooler at 1.5v, also stabilized the cores running at different temps, also lapped my HSF.. AS5 worked allright with it I think, and hmmmm... yea, wet sanding the whole way, DON"T worry about getting it wet, just make sure its dry before you turn it on, I waited a day, my bro used a hair dryer...