This is an open forum, not Adobe support... you do not need to post the same question twice The specified item was not found. and especially not 2 minutes apart
Being an open forum, you will need to wait for another user with the same/similar equipment to come along and provide an answer
While you wait for a detailed answer, go to Tweakers Page and read
Also... please do not post email or other links, so a "spam bot" does not gather your information
I would suggest getting the 680GTX for Mac.
Sorry 'bout that. The double post was accidental - I edited the original and somehow both posted.
I'm aware that this is a forum, not support. I also perused best practices before posting and did not see anything about email address restrictions. After 20+ years, my address is all over the Internet and if someone wants to harvest it, I wish them good luck! . I do appreciate the work of superusers in keeping the forum running smoothly.
Thanks! It is a bit over budget but I may go for it. About the GDDR memory size: do you know if the Mac Pro 2009 can take effective advantage of the extra horsepower of 2or 4gb?
If you have 24GB of ram or more then the 4GB card would be used most likely. However a 2009 Mac Pro wont push either version of the 680GTX to their limits.