I thought the 5870 was a bit of a performance downgrade from the 7300. OSX on the 7300 on my 2006 Mac Pro seemed to be slicker and ran cooler. Definitely more heat and power usage under the 5870 and OSX just a bit slower. However, the 5870 most likely gives me a big performance lift in gaming. I can still run new games (bioshock2, CODMW2) at max.
I thought the 5870 was a bit of a performance downgrade from the 7300. OSX on the 7300 on my 2006 Mac Pro seemed to be slicker and ran cooler. Definitely more heat and power usage under the 5870 and OSX just a bit slower. However, the 5870 most likely gives me a big performance lift in gaming. I can still run new games (bioshock2, CODMW2) at max.