[G4] identifying a Radeon 8500

[Kevin Willis]

Does anybody know a sure fire way to tell if a Radeon 8500 is a Mac 
edition or a flashed PC?  I have dealt with 3 cards from 2 ebay sellers 
and all 3 had the same issue with my Gigabit G4 with Sonnet Encore 
upgrade.  All of them would lock up after a few minutes of the screen 
saver activating or playing Halo.  I finally figured out that they will 
work only if I install my PCI Radeon 7000 in the adjacent slot.  2 of 
the 3 cards were advertised as "Mac compatible", the other was 
advertised as a Mac edition card.  They all had the same number stamped 
on the card...109-85700-00.  ATI said they can't identify the card 
without the P/N 102 number?  There is no number that starts with 102.  
I spent $75 on the Mac compatible card and $100 on the Mac edition 
card.  I would like to be able to go back on the seller that advertised 
it as a Mac edition if I can verify that it is not.  I would really 
appreciate any help.

Thanks--

Kevin