990FX Motherboard ASRock 990FX Killer AM3+ Motherboard 4xDDR3 5xSATA3 M.2 USB 3.1 ATX For AMD Phenom II X6 X4 X3 X2 cpus - AliExpress
Used - Very Good: ASUS M5A99FX PRO R2.0 AM3+ ATX AMD Motherboard with UEFI BIOS - Newegg.com
For Asus Sabertooth 990fx R2.0 Motherboard Socket Am3+ For Amd 990fx 990x Original Desktop Mainboard Sata Iii Used Mainboard - Motherboards - AliExpress
User manual Asus Sabertooth 990FX (English - 184 pages)
ASRock to Release 990FX Killer Motherboard with M.2