Mac Pro 2.1 GPU upgrade

[sirio76]

Hi everybody! first post on this fantastic forum
I'm considering a GPU upgrade for my 2.1 mac pro that I'm using for high end 3d architectural visualization.
Actually I'm running a Radeon X1900 XT 512MB, never had problem before but a new release of my main software(Cinema4d R14) has shown some serious performance issues related to graphic card or graphic card's driver.
On older software version(R13) Cinema4d uses a 2.1 ATI-7.4.1 OpenGL which runs just fine, while on R14 Cinema uses a 3.2 Apple OpenGL like in attached pictures. Somebody on a 3d forum told me that I can force the new software to use older OpenGL version from command line but I don't know how to.
Finally I decided to just buy a newer GPU, but as many of you I'm waiting for the 2013 MP so I don't want to invest big money on my old pro.
Looking online I've restricted my choice to these 3 models, an HD 4870, a 5770 and a more expensive 5870.
http://www.ebay.com/itm/Mac-ATi-Rad...729?pt=PCC_Video_TV_Cards&hash=item3ccf6b9be1
http://www.ebay.com/itm/Mac-ATi-Rad...379?pt=PCC_Video_TV_Cards&hash=item3a7eedfdc3
http://www.ebay.com/itm/Mac-Pro-ATi...882?pt=PCC_Video_TV_Cards&hash=item3a7eeba62a
I'm looking for some advice on which card to choose, and of course let me know if there are better cards for that kind of money.
Thanks in advance


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[bsbeamer]

do you NEED a boot screen? if not, then I'd suggest one of the PC variant GPUs - you'll get more "bang for your buck" that way. check the sticky at the top, lots of info in there.

 

[sirio76]

No, I don't necessarily need a boot screen as long as everything else is working fine. Thank you very much for pointing me in the right direction