Unable to create a 64-bit Windows 2012 VM with a very large memory size

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Issue

When creating a 64-bit virtual machine and assigning 32Gb of RAM, RHEV-M 3.2 displays an error message:
```
Maximum memory size is 20480 MB.
```

Environment

Red Hat Enterprise Virtualization (RHEV) 3.2.0 - 3.2.3

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