Ok thanks for the info. I'll have to wait until we EOL some of the Intel Mac Pros and start looking at their cards.
Probably be a while to get anything worthwhile out of them the first generation had the already mentioned 1900xt and 7300gt from nvidia. Then the HD2600 series was available in the 2nd and the third you had you had 8800gt as an option that I have my MP3,1. The fourth I believe you could get hd5870 which is definitely worth it I have one of them in PC gets 450+mh/s or there is the HD6870 as well good for around 300mh/s, these ones are about the only ones worth getting your hands on for mining. Now I think about it more the HD5770 was there too third generation I believe good for about 200-210mh/s all of these numbers are overclocked cards.