A:Answer Here's the following memory support:
3rd Gen AMD Ryzen™ Processors
4 x DIMM, Max. 128GB, DDR4 4800(O.C.)/4600(O.C)/4400(O.C)/4266(O.C.)/4133(O.C.)/4000(O.C.)/3866(O.C.)/3733(O.C.)/3600(O.C.)/3466(O.C.)/3400(O.C.)/3200/3000/2933/2800/2666/2400/2133 MHz Un-buffered Memory
2nd Gen AMD Ryzen™ Processors
4 x DIMM, Max. 128GB, DDR4 3600(O.C.)/3466(O.C.)/3400(O.C.)/3200(O.C.)/3000(O.C.)/2933/2800/2666/2400/2133 MHz Un-buffered Memory
2nd and 1st Gen AMD Ryzen™ with Radeon™ Vega Graphics Processors
4 x DIMM, Max. 128GB, DDR4 3200(O.C.)/3000(O.C.)/2933/2800/2666/2400/2133 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).
Source:
https://www.asus.com/us/Motherboards/ROG-Crosshair-VIII-Hero/specifications/
