I think both of these users results should be looked into for AM3. Unusual for two members of same team to have results for a 7200GS 64mb, 128, and a 256 and all only in AM3. Also both have at least one extremely skewed result. One over 58k and another over 62k on a 64mb card?
http://www.hwbot.org/user.do?userId=10009
http://www.hwbot.org/user.do?userId=12191