Ok, thanks for the info! Do you know what the fastest BGA chip I could get put in a 5,2 would be?If you want to see how the T9900 upgrade is done, I have a video about it here. Unfortunately, though, doing this as a service is not viable due to BGA variants of the T9900 being near unobtanium. I've tried to modify PGA versions of the chip (as you'll see in the video) with no success, so the only viable way to do it is to pull a T9900 off another MacBook logic board.
Also I guess now would be a good time to ask about your pricing for such a procedure.