Don't buy the G-Rex! I have one and allthough it works, the support is crap. But what is new from DCE and the other people who made the product.
OpenPCI? Bull. Only with the newest flash and if your BlizzardPPC revision is not 2( which most aren't) you have to send the BlizzardPPC to DCE to update the basic ROM to rev 2. Otherwise, stick a Voodoo3 in and lo and behold, it won't boot.
So, you have to flash back and you also can't use the newest Cybergraphx 4.3 and have to stick to the 4.2 beta 11 version. Or send it to DCE and possibly never see it back.
Your only chance is asking the French company that also repairs BlizzardPPC and CyberstormPPC if they can flash to rev 2.
So, does this suck? YES, it sucks. :-x (But what else is new. The tradition of crap support has been handed down from Phase 5 to DCE).