Not so easy, It may or not work.
I have a very similar machine, SB128 did not work and Realtek 8139 no more. Only ESS Solo1 for sound (but not under MOS) and RTL 8029AS (not fast as it should be).
Are you sure you have a REV2 BPPC - DCE doesn't make anymore the flash upgrade operation !
And have you installed 2.2 Firmware for GREX ?? Most of REV0 doesn't work with G-REX.
Is it a "NEUE edition", or a mono DMA updated to dual DMA, or a single DMA GREX ?
Do you well see your PCI slots in the BPPC boot menu (ESC) ? You'll need at least a 200/230W PSU too.
For the difference between Bvision (permedia2v) and Voodoo3, you'll notice a little loss in 2D performance, but a nice benefits in 3D fonctions (more than with a Mediator).
Read you soon

[ Edited by CLS2086 on 2006/3/29 13:28 ]