MBRAMISSUE

If anyone is interested, the lady from ASUS' customer support suggested I RMA or return it to the dealer.

Hey guys, My part list: ASUS X570 TUF GAMING PLUS AMD Ryzen 5 3600X Corsair Vengeance LPX 2x8GB (CMK16GX4M2B3200C16 - ASUS' QVL compatible) So this one is a bit of a doozy. The motherboard will not post into BIOS if there is RAM in either the B1 or B2 memory channels. It will only post, and successfully boot into Windows 10, if memory is slotted into either the A1 or A2, or both, memory channels. When the RAM is in memory channels A1 and/or A2, performance is limited to 2133 Mhz. I can use ASUS' D.O.C.P. to (theoretically) boost this up to its intended 3200 Mhz, but I'm not sure its actually using it. I ran a MemTest86 (the log of which I've included). If I put both sticks into the A1 and A2 channels, the performance is, according to userbenchmark.com "performing way below expectations - as one would expect if the RAM slotted incorrectly (userbenchmark.com/UserRun/25950054). When I only slot one stick into either A1 or A2, the RAM performs as expected. Ordinarily, I would simply return the MB and get another one, or the same one again, but I've read elsewhere that the issue may also be the CPU. I want to troubleshoot this before I take the more drastic step of refunding both. So I guess my actual question is this: is it even possible for this issue to be originating with the CPU, or did I just get a faulty motherboard? Considering that I have already returned a motherboard - having tried, unsuccessfully, the MSI B450 Tomahawk MAX, which would not post at all - I would like somebody else's input before I continue. Also I nuked the Windows Install on my SSD, because I bought a 970 EVO and I would not like to install everything again... And just to make it very clear, the B channels DO NOT post at all. Thanks in advance for any input! MemTest86.log