AnsweredAssumed Answered

AMD-V not always detected in operating system

Question asked by xkyve on May 9, 2016

I was receiving errors when trying to run VMware 64-bit virtual machines. Thinking it was VMware-related, I installed multiple versions with same results. I moved to VirtualBox, but I had the same problems. VirtualBox listed only 32-bit emulation options.

I realized this has something to do with my own computer settings:

  1. I run a Windows 8.1 machine
  2. AMD A6-3650 Llano (FM1) which should support AMD-V
  3. Gigabyte GA-A75M-UD2H motherboard (I even updated the BIOS to latest version)
  4. Virtualization is enabled from BIOS
  5. Hyper-V is disabled from Windows

I installed CPU-Z to see if at least that tool detects AMD-V. Now this is very strange: it sometimes detects AMD-V and sometimes it doesn't - different results in different power cycles (if I restart the computer it may detect AMD-V or not).

Here is a screenshot of CPU-Z when AMD-V isn't detected:

I restart the computer and have different results:

When CPU-Z detects AMD-V, Vmware and VirtualBox are working correctly, also. Why isn't AMD-V detected consistently at each power cycle? I have to restart the computer until AMD-V is detected which may take several attempts.