Some Oracle VM VirtualBox features are labeled as experimental. Such features are provided on an "as-is" basis and are not formally supported. However, feedback and suggestions about such features are welcome. A comprehensive list of experimental features is as follows:
Hardware 3D acceleration support for Windows, Linux, and Oracle Solaris guests
Hardware 2D video playback acceleration support for Windows guests
PCI pass-through (Linux hosts only)
Mac OS X guests (Mac OS X hosts only)
ICH9 chipset emulation
EFI firmware
Host CD/DVD drive pass-through
Support of iSCSI using internal networking
Using Oracle VM VirtualBox and Hyper-V on the same host