It's just 1866 cl9 1.5V which should be OK per - 4 x DIMM, Max. 32GB, DDR3 2133(O.C.)/1866/1600/1333/1066 MHz ECC, Non-ECC, Un-buffered Memory
http://www.asus.com/Motherboards/M5A97_R20/specifications/
It's just 1866 cl9 1.5V which should be OK per - 4 x DIMM, Max. 32GB, DDR3 2133(O.C.)/1866/1600/1333/1066 MHz ECC, Non-ECC, Un-buffered Memory
http://www.asus.com/Motherboards/M5A97_R20/specifications/