Do you even know what you are talking about?
First the 7970, 7950, 7870 and 7770 are supported as of 10.8.3. The 7990 is a dual GPU and there never has been Crossfire in Mac or SLI for that matter and there are no signs this is changing.
Second you can put any GPU in a Mac Pro without voiding the warranty.
Last the K5000 is meant for 3D work such as CS applications. Apple looks at the needs of developers not gamers. So I ask you to only comment on such items that you are informed about and know what the purpose of such a machine is designed for.
Thanks, but I know exactly what I'm talking about. Nothing you said was any news to me whatsoever and I didn't say anything that was incorrect. The K5000 is a mid-range Pro card and far from AMDs best just like I said. But thanks for the rant.
I said "possibly" void warranty and if you're so sure that it doesn't perhaps you can explain to the forum how one might install a 7990 (or 7970) into the existing Mac Pro with its two 75W 6-pin power connectors available to the PCI slots.
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