Yep... I will never buy a first gen Mac again. I was also burnt on the first G4... it was supposed to be a 400 and was clocked back to a 350 and also had the old mobo in it. Then I bought the first dual processor... the dual 450... Apple had to totally replace that machine after months of agony.
Because it involves X-Plane.. and because it says this...
The Radeon HD 4870 is a welcome CTO option for the 'early 2009' Nehalem Mac Pro. And we're glad to see that it is sold in kit form. You will need the February 2009 ATI drivers but those should be available to all users in the next Apple system update. (Though Apple only officially supports it in the 2009 and 2008 Mac Pro, we have confirmed it runs in the 2007 and 2006 models.)
"Apple is officially supporting only 2009 and 2008 Mac Pros with the Radeon HD 4870 kit. And it requires either the build of OS X 10.5.6 with the February 2009 ATI drivers -- or OS X 10.5.7 (not yet golden).
As with the Radeon HD 3870 and HD 2600, ATI included both a 32-bit and 64-bit EFI driver in the ROM, so it should work in all models of Mac Pro with the latest drivers. We installed in the Clovertown first generation 8-core Mac Pro (as you can see from the graphs above) and a close colleague installed it in a 2.66GHz Woodcrest 4-core first generation Mac Pro. As long as you have two power feeds for the card in your first generation Mac Pro and have the correct drivers properly installed, it should work fine."
Do not argue with an idiot. He will drag you down to his level and beat you with experience.
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