As far as I know even if you do have a card that has the correct BIOS version it still will not work under Amiga OS 4.0 Classic.
I am unable to get my ATI Radeon 9200 Pro cards to work under AmigaOS 4.0. I have got a 64 MB and a 128 MB version both do not work.
Basically Amiga OS 4.0 decides to go on an infinite reboot.
Hans-Joerg Frieden (Rogue) has replied on the Amigans.net forums stating that it cannot be done at the moment in the current kernel update for classic 'February 2008' for Amiga OS 4.0 classic.
http://www.amigans.net/modules/newbb/viewtopic.php?viewmode=flat&type=&topic_id=2364&forum=3Rogue mentioned:
"The Radeon driver in AmigaOS 4 relies on the BIOS to set up the card, so it won't work as-is on the Classic. I'll look into this if we release an update for the Classic version (note the 'if'; I don't know if or when one is planned)."
When 'if' they do plan to release another update, that is on his list of things to do. At the moment OS 4.0 only has compatibility for the use of Radeon cards on the AmigaONE. Amiga OS 4.1 and beyond on the SAM boards has full support of course.
BTW, how did you get the Voodoo 3 and the Ethernet to work under Amiga OS 4.0. I have had no luck with this. I have also posted this elsewhere on these forums:
http://www.amiga.org/forums/showthread.php?t=50242You can only try the latest Mediator drivers under Amiga OS 4.0
I have had no luck so far getting any of my devices to be recognised under Amiga OS 4.0. Then again I am even having similar issues under Amiga OS 3.9.
Good Luck.