Difference.

Whats the difference between x1 and x2 jerseys, armbands etc? how can I know if x1 or x2 is compatible with my nba live 2008? thanks guys.

Patches that are "2x" are larger in size than normal, eg 512 x 512 rather than 256 x 256. You shouldn't have any compatibility problems per se, but if you have too many 2x patches installed the game will crash.