The AMD FX-6300 3500MHz Vishera 95W (Since BIOS version FFe) may be a good choice.
Supported processors:
(letters on end indicate "since BIOS version")
W denotes watts and TDP (Thermal Design Power)
AMD Opteron 3280 2400MHz 1MBx8 8MB Bulldozer 32nm B2 65W 5200 FFe
AMD FX-8120 3100MHz 1MBx8 8MB Bulldozer 32nm B2 95W 5200 FE
AMD FX-8100 2800MHz 1MBx8 8MB Bulldozer 32nm B2 95W 5200 FD
AMD FX-6300 3500MHz 1MBx6 8MB Vishera 32nm C0 95W 5200 FFe
AMD FX-6200 3800MHz 1MBx6 8MB Bulldozer 32nm B2 125W 5200 FE
AMD FX-6120 3500MHz 1MBx6 8MB Bulldozer 32nm B2 95W 5200 FD
AMD FX-6100 3300MHz 1MBx6 8MB Bulldozer 32nm B2 95W 5200 FD
AMD FX-4170 4200MHz 1MBx4 8MB Bulldozer 32nm B2 125W 5200 FD
AMD FX-4150 3900MHz 1MBx4 8MB Bulldozer 32nm B2 95W 5200 FD
AMD FX-4100 3600MHz 1MBx4 8MB Bulldozer 32nm B2 95W 5200 FD