AMD TRX40 AMD Socket sTRX4 for 3rd Gen AMD Ryzen Threadripper Series Desktop Processors DDR4 4666(O.C.)/ 4600(O.C)/ 4400(O.C)/ 4333(O.C.)/ 4266(O.C.)/ 4133(O.C.)/ 3800(O.C.)/ 3733(O.C.)/ 3466(O.C.)/ 3400(O.C.)/ 3200/ 2933/ 2800/ 2666/ 2400/ 2133 MHz ECC and non-ECC, Un-buffered Memory