actually the amd patch is not the only one you need if you have not done this one yet, i have an am2 4800 and i was having nothing but problems with the chop issues, so after a little more research i came up with a microsoft patch i have applied this to a couple dual core and worked for both and it settled down completely but i would still get the amd optimizer to help it's issues out some. hope that helps a little, should work for both lan and internet play on all levels of games
http://support.microsoft.com/kb/896256