Roughly.. No more then 1.4vcore Try to stay below it, however some oc's will require you to go tad above it. Then: No more then 1.375 VTT (absolutely MUST! do not venture off in the 1.4v unless u dont intend to keep that chip longer then 6-8months... possibly even shorte). While holding the 2 above: Keep your QPI link LOW... like 4.8mts low... gulftowns do not like a high qpi link. My 24/7 settings are: 1.3875vcore 1.325 Vtt 1.325 QPI 1.65 Dram This is holding 4.3ghz /w HT On. This is on hexcore, the quadcores are easier to handle i heard.