ASUS PRIME B450M-K AMD AM4 mATX Motherboard (ASUS PRIME B450M-K) - AMD AM4 Socket for 3rd/2nd/1st Gen AMD Ryzen™/2nd and 1st Gen AMD Ryzen™ with Radeon™ Vega Graphics/Athlon™ with Radeon™ Vega Graphics Processors, Memory: 2x DIMM, Max. 64GB, DDR4 4400MHz, Expansion Slots: 1 x PCIe 3.0/2.0 x16 PCIe x1 Slot, Storage: SATA 6Gb/s*4(RAID 0, 1, 10) USB 3.1 GEN 1 (USB 3.0) 2@front; 4@back USB 2., Operating System: Windows 10 64-bit, Windows 7 64-bit, Form Factor: 8.9 inch x 8.7 inch ( 22.6 cm x 22.1 cm ), Onboard VGA Output Available: 1 x VGA + 1 x HDMI