...you must re-flash your BPPC firmware again, it does not matter if it is already flashed in the past with the latest firmware, u must reflash it!!!
I got today my rev2 g-rex with the 2 DMA slots, and I thought I should just replace the g-rexes and nothing else... wrong, until I reflash the bppc (thank god I thought of that) there was no output from the voodoo3, eventhough it show on the PCI menu... strange eh? unless the addresses whrere different betwenn the 2 g-rex versions...
Thought u should know... :-D :-)