1/2 32gb RAM not showing up: Asus 990FX Sabertooth + 4x8gb G.Skill RAM

I have:

- Asus 990FX Sabertooth motherboard
- AMD FX-8120 8-core CPU 3.1Ghz, not overclocked
- 4x8GB G.Skill DDR3 1333 PC3-10600/10666 CL9-9-9-24 1.5V

The individual sticks show up in the UFI Bios, but only 16Gb is exposed to the OS.

Does anyone know if I have to enable the even-numbered banks somehow, or change voltage or something to cause the BIOS to expose all 4 DIMMS to the OS?

I am doing heavy virtualization for home/experimentation work.

3 answers Last reply
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  1. Which OS are you using. You might be hitting a 16GB OS limitation.
  2. Good question. The OS is VMWare's Free Hypervisor:


    But while the DRAMS are showing up as 4 DDR chips of 8192 Mb, even in the BIOS, it is saying that it only sees 16 Gb. That's the odd part.

    Also, I've checked the CAS/Voltage and other settings. They default to the on-box specified timings and voltages. I gotta be missing something here. I can also intall any combination of the RAM chips and they work. All chips are good, but it's maxing out at 16Gb. It's supposed to support 32Gb per the Motherboard specs.

    Thanks for taking the time to respond!!
  3. How did you resolve this issue? I have exactly the same problem.

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