VirtualBox - Increase video memory

 

zzh@ZZHPC:~$ VBoxManage modifyvm zwin10 --vram 256
zzh@ZZHPC:~$ VBoxManage modifyvm zwin10 --vram 512
VBoxManage: error: Invalid VRAM size: 512 MB (must be in range [0, 256] MB)
VBoxManage: error: Details: code NS_ERROR_INVALID_ARG (0x80070057), component GraphicsAdapterWrap, interface IGraphicsAdapter, callee nsISupports
VBoxManage: error: Context: "COMSETTER(VRAMSize)(ValueUnion.u32)" at line 736 of file VBoxManageModifyVM.cpp