The latest beta bios seems to fix Ab code for me.
Have a try.
Hello there !
I am having the same issue but with some minor differences, slots A1 and B1 give me error code C5 which indicates bad cpu socket or whatever(which i did not try to remount or check the pins yet) and slots A2 and B2 work just fine. I have this kit:
F5-6000J3238F16GX2-TZ5NR
Now the real problem is with one of the dimms it works just fine, the other either gets stuck at code 46 with no bios tweaks or passes after 2 seconds code 46 and gets stuck at code Ab when i enable memory power down and disable mem context restore. I tried with the default bios of the motherboard(msi x670e carbon), with v18 and with the current 1B1 version which is the latest beta. I can't seem to get around it. Tried kind of anything from all the threads and whatnot. I know for a fact that the board/ram/cpu are not bad cuz when i first booted it up it worked just fine, no errors no nothing, after about 2-3 hours or so the pc randomly black screened(mentioning i was doing absolutely nothing intensive, just watching some you tube) pc tried to restart and it got stuck at code 46.
Since then i have had 0 luck in trying to fix these issues, except the fact that i moved from code 46 to code Ab with the mentioned changes that i made. Also i should mention the system is perfectly stable on 1 ram, stick(16gb sadly), idle temps at around 40-45, some games when starting up it kind of jumps to the 75 and short burst to 80 degrees and stabilises at around 65-72 depending how intensive the task at hand is. No crashes no problem with restarts, no instability, no stuttering no nothing. Except the other dimm.
Also, i tried with both dimms in A2B2 and it still passes 46 into Ab. I can not seem to understand what caused it to either brick the ram dimm or something. Also the bad one on all 4 slots either stops at 46 with no tweaks C5 in A1 or B1 if it passes 46 sometimes or straight Ab.
I can not get my head around this problem and i am at a loss for words. Mobo seems fine, runs cool and all, nothing smells like burnt bacon and i'll check the pins from the slots tonight to see if it fixes anything.
Also i ordered a new non rgb kit, amd expo enabled corsair vengeance 32gb dual rank, cl30 at 6000MTs. If they work that means it was a faulty dimm. but it's unlikely
.