Asus PRIME B660M-A D4-CSM Compatibility Processors 13th Gen Intel & 12th Gen Intel, Pentium, Gold and Celeron Form Factor Micro ATX Socket LGA1700 Chipset B660 Memory Type DDR4 Memory Slots Type DIMM Memory MHz 5333(OC)/5000(OC)/4800(OC)/4600(OC)/4400(OC)/4266(OC)/4000(OC)/3733(OC)/3600(OC)/3466(OC)/3400(OC)/3333(OC)/3200/3000/2933/2800/2666/2400/2133 Non-ECC Number Of Memory Slots 4 Max Memory 128 VRM DIGI+ VRM, VRM heatsink design BIOS 128 Mb Flash ROM, UEFI AMI BIOS PCIe 4.0 x16 1 PCIe 3.0 x16 (x4 mode) 1 SATA Controller Intel B660 SATA 6Gb/s Connectors 4 M2 Slots 2 Raid Support 0,1,5,10 Intel Optane Memory Ready H Series on PCH attached M.2 slots Intel Rapid Storage Technology support Yes LAN Controller Intel LAN Speed 10/100/1000 System Realtek Number Of Audio Channels 7.1