There's no dual core for socket a, and high end socket a cpus are scarce. Frys in stores only has 2 upgrades still on special today only for $70 or less; one amd and one Intel dual core. Newegg has a sempron .045 140 for $58 after rebate and email promo discount, but you have to register first to get on their email list. I get about 3 a week from the egg. Check for other combo specials; they had the Intel e5200 with g31 board for around $112 recently, but expect to pay more for ddr2 memory. Memory prices are rising. 2x2gb kits for $60 are getting scarce.