Hi,was not sure which section to put this in as it is to do with CPU and Mobo.
Anyway my question is what kind of performance loss(if any) i would get if i put a AM3 cpu into a AM2+ motherboard with the appropriate bios update.Would it be best to upgrade the mobo as well?
You'll be working with an older memory standard (DDR2) and probably different feature-sets, but if the AM2+ board supports AM3 chips, there won't really be a noticeable difference in performance between it and an AM3 board.
There is a minor loss when going from DDR3 down to DDR2. You would not notice any loss since you do not have personal experience. I doubt even if you were used to a DDR3 setup and went to a DDR2 (with the same processor) that you would be able to notice much degredation at all.