I had to try several Radeons before I got one working with OS4.1 Classic in my A1200T, most 9200 and 9250 I tested did not boot, one even caused my FastATA MkIII to explode a mach chip! :lol:
The one that I have here and working is a 'saphire' badged 9250 (128mb)
If you can find one that's the best bet, many 'budget' Radeon's have the mobility chip and I'm told this does not work with OS4.1 Classic.
Steve.