Quote Originally Posted by FlanK3r View Post
"P" can be some as "premium" or "performance". Because all FX models are unclocked
Could be many things:

-More cache
-More turbo
-More clock speed differential (ie a 200mhz increment over lower parts which are 100mhz in between)
-Premium package (beefier cooler, special warranty, special stickers etc)

Not necessarily mutually exclusive.