my max OC with FW on was 525/580 stable in everything except far cry, i had to drop core down to 510. i could not up the core at all with the Vmod. i disabled FW in bios, and my Max OC was 550/580 stable in everything including far cry, and i was able to OC to 600/585 with Vmod. got 11,604 points in 3dmrk03