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by gizmo686 4494 days ago
I can't speak to OSX, but on linux I know that virtualbox likes to install kernel modules into the host. If your VM does that, then it should be able to get direct hardware access.
2 comments

VirtualBox on OS X uses an installer, instead of being a .app you can drag to your Applications folder, so I assume it does as much.
VM software will not ship with drivers for all potential GPUs.

They use the platform graphics APIs like any other app.