• CPU
  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
  * Due to CPU limitation, CPU cores supported varies by processors.
• Chipset
  AMD B450
• Memory
  3rd/2nd/1st Gen AMD Ryzen™/ 2nd and 1st Gen AMD Ryzen™ with Radeon™ Vega Graphics/ Athlon™ with Radeon™ Vega Graphics Processors
  4 x DIMM, Max. 128GB, DDR4 4400(O.C)/3466(O.C.)/3200(O.C.)/3000(O.C.)/2800(O.C.)/2666/2400/2133 MHz Un-buffered Memory
  Dual Channel Memory Architecture
  ECC Memory (ECC mode) support varies by CPU.
  * Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists).
  * The maximum memory frequency supported varies by processor.

https://www.asus.com/Motherboards/PRIME-B450M-A/specifications/