Do a search. These issues have been thoroughly covered. The latest firmware update helped the fans a lot in the Mirrored door model. There's a lot of heat generated in this model, however, so it's best placed in a machine room (something any serious studio should have, anyway). The three ATA busses including an ATA 100 bus in the newest 1 Ghz and 1.25 Ghz DP models is very nice, as is the faster 167 Mhz bus. Finally, I'm getting great video playback with my miro card. You can also mount four hard drives in the newest models, and the faster ATA 100 bus is useful. If you've waited this long, though, you might want to wait a bit longer and get in on the next batch of Macs. Supposedly, they'll only boot OSX, but by that time PT6 might be out. BTW, memory for these new machines is not very expensive. Shop around. Lee Blaske