You have a foxconn board and you also have their latest bios. The good news is that you can run any 5xxx core2 duo cpus such as the e5400, and also the 8xxx wolfdales such as the e8500. Your board won't run a quad core; it has a wattage limit of about 95. Check ebay for one of those dual core cpus; a 5400 might go for $50-60; the e8500 for $90-100. For motherboards, you might look at a g41 for ddr2 or upgrade to ddr3. 775 boards come in a wide variety of chipsets; the p43 is common now; some of the older p45, x38, and x48 are harder to find. You probably need to use only micro-atx unless you have a full size case, which takes atx or micro atx boards.