The ports are standard fare even on the PC side, so that part of your argument's shot.
No, the standard port configuration on this card is two DVI ports, two mini DisplayPorts, and an HDMI port. This card requires a different backplate and DVI port assembly.
The drivers are in-house from Apple. Vendors don't do driver updates for OS X on the graphics front. AMD certainly doesn't, at least not on their own - they work with Apple's software engineers, with the Apple folks doing the brunt of the heavy lifting.
Contrast this with the days of the HD3870 Mac Edition, where AMD made the drivers (and one last version of the ATI Displays software for OS X before it was all handed over to Apple). The 3870 Mac Edition was a Sapphire designed card BTW. Originally they were going to use an HiS board design, but it didn't pan out, so they went with Sapphire's design instead. I still have my 3870 here from before I got my 5770, and then a 5870 (giving the 5770 to a family member for their PC).
As for the cooler, the design is a stock design, and only the artwork/coloring is different. That's a minimal cost right there, and the backplates cost pennies as well. Given that the Mac Pro's PCIe Bay Fan blows directly onto the card, there wasn't a whole lot of engineering work that had to be done to maintain proper cooling. It's essentially the 5870's heatsink design.
All you did here was elaborate on my argument that this card cost Sapphire virtual nothing to develop. The extra costs are primarily associated with retooling to produce a different cooler and port configuration. So my argument is not "shot" as you say.
The cost of this 7950 is based on demand, not development costs.
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