His mobo will support a AM3+ CPU
all he really needs is a new cpu and gpu
http://www.gigabyte.com/products/product-page.aspx?pid=3894#sp
AMD FX-8320 3500MHz 1MBx8 8MB Vishera 32nm C0 125W 5200 F9
AMD FX-8320E 3200MHz 1MBx8 8MB Vishera 32nm C0 95W 5200 F10e
AMD FX-8310 3400MHz 1MBx8 8MB Vishera 32nm C0 95W 5200 F10e
AMD FX-8300 3300MHz 1MBx8 8MB Vishera 32nm C0 95W 5200 F9
AMD FX-8150 3600MHz 1MBx8 8MB Bulldozer 32nm B2 125W 5200 F3
AMD FX-8140 3200MHz 1MBx8 8MB Bulldozer 32nm B2 95W 5200 F3
AMD FX-8120 3100MHz 1MBx8 8MB Bulldozer 32nm B2 125W 5200 F3
AMD FX-8120 3100MHz 1MBx8 8MB Bulldozer 32nm B2 95W 5200 F3
AMD FX-8100 2800MHz 1MBx8 8MB Bulldozer 32nm B2 95W 5200 F3
AMD FX-6350 3900MHz 1MBx6 8MB Vishera 32nm C0 125W 5200 F9
AMD FX-6300 3500MHz 1MBx6 8MB Vishera 32nm C0 95W 5200 F9
AMD FX-6200 3800MHz 1MBx6 8MB Bulldozer 32nm B2 125W 5200 F6
AMD FX-6120 3500MHz 1MBx6 8MB Bulldozer 32nm B2 95W 5200 F3
AMD FX-6100 3300MHz 1MBx6 8MB Bulldozer 32nm B2 95W 5200 F3
just might need to update his bios