I have tried setting a resolution of 6400x4800 in windows 7 guest running under VMware workstation (ver 9) and in another guest under ESXi. The max I could get is 2560x1920.
Both places I have set appropriate svram size and other options in .vmx file. Even with vmwareresolutionset.exe I have not been able to set higher resolution.
Tried proxmox few years back but could not get what I needed.
Any tool or any other vm solution is fine for me. Thanks in advance.