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The Early 2009 Mac Pro—also known as the Mac Pro 4,1—introduced Intel's Nehalem architecture to Apple's line of professional desktop computers in March 2009. The Mac Pro 5,1 used the same interior design but received further CPU updates in 2010 and 2012.

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Mac Pro 5,1 with flashed Sapphire 580 reboots and no screen or colored

Dear All,

I need some help getting a Flashed for MAC R 580 to work or checking he is broken.

I read more problems with Flashed for MAC Radeon 580 8Gb GPU in a Mac pro 5.1 and I have that too.

My mac pro 5,1 is with Boot ROM 144 SMC 139f5 and Mojave installed and one boot vol Catalina and cant make it run steady. If I boot Mojave with a flashed 7970 no problem at all and with the 580 it not running good. Rebooting after some time or i got full colored screens. Green Red Orange or blue…

Even tried to switch the dual Bios switch to quiet or normal game mode. No diff.

I connected the 580 GPU with a specials dual 2x 6 pin to 8 pin cable like written everywhere. Cable came with it.

How i fix this or can I check the Flashed for MAC 580 in a normal PC?

Thx sofar.

Answered! View the answer I have this problem too

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I am not aware that the Radeon HD 7970 was metal capable which is needed for Catalina.

Will the Sapphire 580 run Mojave OK? Who flashed it?

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Cas will be eternally grateful.
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