ATI/AMD has no proprietary driver for BSD, but they do release NDA free documentation and have paid developers working on xf86-video-ati for both 2D and 3D acceleration.
The problem with newer cards is the userland Xorg driver lacks support for modesetting and only supports kernel modesetting, at this time only Linux supports that API.
The open source xf86-video-ati can do userland modesetting for Radeon R200 up to Radeon R700, but the kernel needs to support DRM/DRI to get 3D and XVideo acceleration.
The Radeon HD 4650 is part of the R700 family, OpenBSD has some support for that now, sometimes with some manual effort..
I don't know how FreeBSD is doing, but give it a try.
As for nVidia, they have proprietary drivers for FreeBSD only.. if you choose to use them, that's your prerogative.
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