March 10, 20224 yr Hi All, I have a Supermicro X9DR3-LN4F+ in a Supermicro server case. It has currently 4 sticks of HMT42GR7AFR4C-RD RAM.. They are 16GB each Dual Rank RDIMM’s. When I bought my server I didn’t touch the included 64GB of RAM. I bought an additional 64GB of RAM for it today with the same exact memory type and size. When following the directions in the manual for a dual CPU Setup, CPU1 + CPU2 P1-DIMMA1/P1-DIMMB1, P2-DIMME1/P2-DIMMF1, P1-DIMMC1/P1-DIMMD1, P2-DIMMG1/P2-DIMMH1 and boot the system it stops at B7. I noticed that my original configuration was B1 D1 F1 H1. When swapping out my memory for the new memory in THAT configuration, it will fully post with no issues, so I know the new RAM is fine. If I try and use the motherboard manual guide for dual CPU for 4 sticks, it should be A1 B1 E1 F1. With that configuration the system gives me a black screen and doesn’t post. Is there another configuration I should try to use to get 8 sticks working? I’m worried that there might be a socket failure. Any advice will be appreciated. EDIT - Solved: Reached out to Supermicro support and a really nice tech responded with some suggestions. It turns out I had to reseat the CPU's to get this to work. Edited March 11, 20224 yr by zenmak
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