Neither 3870 nor 8800GT are sold by Apple. They were discontinued while my MP was still under warranty. A 3 year old Pro desktop is not an obsolete computer, for Xsakes! Oh yeah, according to Apple it is
FYI, there are MPs out there purchased less than 2 years ago for which there are no video cards officially supported/sold by Apple. This sucks, not to mentioned it's fraud, given that these machines were sold as "the most upgradable Mac". Apple did not tell me that I will have as little as one year to upgrade my MP with a better video card.
I put the Apple branded 4870 in my MP because, contrary to Apple's misleading information, it does work perfectly fine in a 2006 MP. I intend to exercise my right to obtain warranty service on this card, should I ever need it, even if this means using another MP's serial number to obtain it.
Are we on topic now? Good.