3DMark 01 in Windows 2000 (VMware) in XP (VirtualBox)
This VM combination provides unexpected outstanding performance compared to my first attempt (VMware in VMware).
It does have some graphic glitches (caused by defective Direct3D of VirtualBox), only DirectX 8 and 9 are supported. Sometimes the sound will be out-of-sync too.
BTW it is much better than VMware in VMware, where you will only get a black screen for the Direct3D of VM in the VM, unless you use a special method that only works on certain type of games.