http://www.overclock.net/t/1431723/mod-lga775-support-for-lga771-xeon-cpus
http://www.overclock.net/t/1427554/official-775-to-771-mod-club
http://www.overclock.net/t/1431723/mod-lga775-support-for-lga771-xeon-cpus
http://www.overclock.net/t/1427554/official-775-to-771-mod-club
a lot of knowledge able people there if you need help. also you might be able ot find out if you mobo or chipset is compatible .
also Overclock.net has a how to on how to mod the bios OR you can politely ask someone if they can mod your bios for you. there already several working Xeon modded bios that work floating around OCN.