You >> Anyway after 3 or 4 boards from Asus I got one that working so far but I noticed something strange.
Question: What was the issue that had you getting 3 or 4 boards from Asus?
You >> I couldn't get the board to boot with the good memory in the A slots. I would boot in the B slots fine.
Suggestion: Use the B Slots then and certainly so while you wait on the mate to your current memory stick. By the way, when I RMA ram, I do so in pairs so that the ram 'set' should be made up of the same type of ram stick.
You >> AMD overdrive and it shows my CPUNB voltage in red and at 1.375 volts. What gives with this?
Answer: That is an inbuilt setting chosen by the mobo according to Bios programmers. Asus may have decided to get DDR3-1600 speeds the CPU_NB needed to be X voltage.
You >> Could the bad ram stick have damaged the IMC on the CPU?
Answer: Possible one may suppose but not so likely. Is the memory in bios set to run "ganged" or "unganged"? Run it "unganged".
By the way at this time, only swapping out the cpu would verify a wonky memory controller (IMC)
You >> What should the CPUNB voltage actually be?
Answer: Generally it would be 1.175-ish for Deneb type cpu.
You >> Is there a program that will read all the voltages?
Answer: Almost without fail we use Free HWMonitor in the AMD Forum Sections. How much information is given is really board dependent though. A chip on the board is read by the reporting software and what 'is' reported depends on what the board engineers routed to the 'reporting' chip.
I went back to your first post and made my responses from it. That is where the crucial information may have been hidden before we began a big trouble-shooting journey, which by the way, there is nothing wrong with doing.
I will suggest this to you though. Check the "ganged/unganged" thing. Adjust as suggested. Check for the one stick of ram you are left with working in A or B type slot then. If it does not work, you have parts and pieces that are going to have to go thru a process of elimination again. In your first post Asus has already agreed to swap out the 4th or 5th mobo based on actual RMA count. No way to really verify suspect IMC without swapping out the cpu. You going to do that? No I did not think so. Why not? Well you are only likely to run 2 sticks of ram anyway and that 790Chipset board you have is getting long in the tooth.
Because of what I just mentioned in that paragraph above, I would put the one good stick in a working slot and use my computer. When a replacement stick comes I would put it in the correct memory slot to produce dual channel mode and rokkon. You are not likely to need more than two sticks of ram as mentioned earlier and you are driving yourself nuts with actual swap out of parts needed to be done to really troubleshoot much further. It seems time enough to have a little fun out of your system. IMO. For sanity sake with an older 790 chipset mobo.
RGone...
I'll try to answer all your questions.
#1- I sent my original board to Asus because the BIOS got corrupt. I was using the computer when it suddenly blue screened. I restarted it and it went to the splash screen and then quickly blue screened again and restarted and did it again. I shut it down and restarted and the BIOS was corrupted. I tried to flash it but it wouldn't take. I sent it to Asus. It came back with the BIOS reflashed. I put it together and as soon as it started I got the corrupted BIOS message again. I tried to flash it again but no go. I sent it back to Asus and they returned it with a reflashed BIOS chip. It did once again. I sent it back and they sent a repaired board. I installed everything and booted it up. You may have guessed it. Corrupt BIOS again. I call Asus and we discussed about bad memory or bad CPU. They eliminated those and focused on the HD and a virus. He had unhook the HD and flash the BIOS. It took. I then restarted and the BIOS was corrupt again. I sent this board back. In the meantime I login in here and ask about what could be corrupting the BIOS. I get some replies and it's determined a memory problem. I get another board which is the one I have now. I use it and determine one memory stick is bad and also that the A slots won't work.
#2- When I get the stick back, I don't think I can run memory in the B slots. Asus suggests using the orange slots which are A1B1. That would put my memory in the B1B2 slots. I asked about sending both sticks back and was told by Adata that they could match the stick.
#3- On my original board, I remember from AOD that the CPUNB voltage was never that high. I used it to look at voltages while I OCed the CPU.
#4- I 'll check in the BIOS for ganged etc. but I don't think there is a setting for that. I have been all thru the BIOS and don't remember seeing that choice.
#5- The reason I ask about the CPU IMC being bad is the commonality of the A slots not working. I haven't found anything showing the interconnections of the CPU and the memory. From what I can find is the memory is connected to the CPU which contains the IMC directly and was wondering if the memory shorted and damaged the IMC on the CPU.
I ran HWmonitor and changed the CPUNB voltage but never saw a corresponding change in any voltage in HWmonitor. It could be the board is indeed flaky and not reporting voltages right. IDK
I plan on keeping the computer for a while longer. I don't want to upgrade mobo and cpu at this time. I don't want to loose everything on my HD at this time. I'll get this board replaced or what ever and see what happens with a different board. If the next one does the same thing, I can figure the IMC got hosed. I would like to run 2 sticks in the correct slots to get the max out of it while I can.
Thanks for your thoughtful reply. I hope I answered everything.
I found this in the BIOS.
DCT unganged mode
Auto-by dram settings
enable-unganged mode
disable-ganged mode
I'm set to auto.