I have a Foxconn board that has SB750, a Biostar that has SB600, and a ASUS that has SB700. Out of three the ASUs overclocks the best. ACC does nada for my PII 940. In fact, when enabled it makes things screwy so I don't even deal with it. The SB700 suits my taste and is ALOT more stable. Some love ACC and some don't. IIRC, ACC was really just ment for the 1st Phenoms and I am beginning to believe it because I fair no better/worse on the SB750 vs SB700.