is it E0 stepping. I didn't know the e8500's had E0 out yet.. thats great. the fact that it is a E0 stepping I'm SURE you could get to 4.5 Ghz on Air.. perfectly fine.. or higher. the E0's are great grreat overclockers. Where did you get it.

also the Q8 means it was made in 2008, 22 means the 22nd week of the year.. so Middle of May 2008. and A is where on the Wafer it was cut from. I'm sure it will work fine. All the E0's seem to be very good, and very stable.

Good Luck!