Unusable Ram in Windows 8.1 Pro

tunaguitarman · Jun 10, 2014

Hello all, I could really use some help and it seems like this is the best place to get it. Here is the problem:
When I log in to Windows and look at the installed RAM is shows 16GB with 7.95 useable.

My build is as follows:
Windows 8.1 Pro 64
MSI 970A-G46 MB
AMD FX-8350 4.0Ghz
4*4GB G Skill RipjawsX 2133
Zotac 210 Synergy 1GB 64bit ZT-20313

I have unchecked the Max memory option in Start up and tried some other things mentioned in previous threads but nothing has helped. This is my second set of RAM as the first set was RMA'd...and what G Skill tech support recommended.

Any help or suggestions would be wonderful.
As an add on, I would like to purchase a new graphics card...any suggestions there?

Tradesman1 · Jun 10, 2014

Try raising the CPU/NB voltage to 1.275 and try the freq at 1866, seriously doubt you're going to be able to run run sticks at 2133 - the CPU itself is only rated for 2 sticks at 1866....but give 1866 a try if no joy may have to drop to 1600

Pinhedd · Jun 10, 2014

tunaguitarman :

This typically indicates a problem with either the DRAM modules or a DIMM slot. What you should do is try and isolate the problem.

Try booting the PC with each DIMM individually, all in the same slot. If it boots 3 out of the 4 times successfully and recognizes 4GiB of installed memory, then the 4th module is most likely faulty. One module can drag down an entire channel, so it could explain the failure of half of your memory.

If all 4 DIMMs check out, test the slots next. Try booting the PC with one module in the first slot, then one module in the second slot, and so on.

tunaguitarman · Jun 13, 2014

Pinhedd :

Went through and tested each DIMM individually, they all booted just fine. Went on to test the slots and both slots 3 and 4 won't boot when testing them with the paired slot (2 with 4 and 1 with 3) it showed 8GB of Ram with 3.95 useable...does this mean I need to contact MSI and attempt to get a new board? Or are there additional settings that I am missing to activate those last two DIMM slots (3 and 4). Thanks for your help so far!

Pinhedd · Jun 13, 2014

tunaguitarman :

Pinhedd :

Went through and tested each DIMM individually, they all booted just fine. Went on to test the slots and both slots 3 and 4 won't boot when testing them with the paired slot (2 with 4 and 1 with 3) it showed 8GB of Ram with 3.95 useable...does this mean I need to contact MSI and attempt to get a new board? Or are there additional settings that I am missing to activate those last two DIMM slots (3 and 4). Thanks for your help so far!

There's no additional settings. Contact MSI for a replacement

tunaguitarman · Jun 13, 2014

Tradesman1 :

Tried this to no avail but I believe that I may have two bad DIMM slots...I didn't think that was possible.

Pinhedd · Jun 26, 2014

tunaguitarman :

Don't know how I missed this before.

X86 memory channels are multi-drop busses. Most consumer motherboards have two DIMM slots per channel and all of the signals except for the Chip Select signal are connected to both slots in the same fashion. As such, a failure in one wire can indeed render two DIMM slots inoperable.

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