My MOBO is socket 775 Want to go fron pentium D 820 to Q6600. What is there to consider? Will it run quad? Quads were not out when MOBO was built. Does the Bios have to be quad ready? Not 100% sure, i think the MOBO is P4M800PRO-M, i can check later when i'm at home if you need it.
according to this link then no quad. http://www.ecsusa.com/ECSWebSite/Support/CPU_Support_Model.aspx?detailid=552&MenuID=69&LanID=9
No, you can't use a Quad core with that motherboard. Besides, the build quality of a lot of ECS boards means even if it was, it would probably melt after a few weeks.