Thanks for the advice. unfortunately my ballistix memories can't do 4-4-4-12-15. it's rated at 2.2v at default, but i have no idea what chips are used. right now i have to set vdimm to 2.3v and i hope that's not too high of a voltage. back to 4-4-4-12-15, i know that the first 4 is CAS latency. The second 4 is RAS to CAS right? what's the third 4? the 15 is TLC correct? I always get confused when i see it written this way . i'll try again to see if i can improve the memory settings in the bios.