I would definitely recommend only trying it once though. If you mess it up you can just switch the BIOS and it will still work. Silver Tower Mac Pro (Dual Optical) Q&A – Updated DecemVideo Card What graphics card can I put in a Mac Pro?
The drivers and routines are model-specific which are provided by the GPU manufacturer. To perform graphics processing, OSX calls the GPU drivers and the drivers then call the routines (machine code) stored in the BIOS chip. OSX does not directly communicate with the GPU. A missing clock will cause a black screen. The clock is used to sync the GPU internal modules and external communication buses. A partially failed LVDS Bus can result in lower display resolution, vertical lines on the screen, a darker screen, and so on. The GPU uses LVDS or DP Bus to communicate with the LCD screen. Failure of any of these lanes will cause GPU malfunction. The GPU uses an 8-lane or 16-lane PCI_E Bus to communicate with the CPU (Central Processing Unit). A faulty GMUX chip usually causes a black screen but sometimes can cause other graphics symptoms. Apple’s OSX uses the GMUX chip to automatically switch between the Intel’s integrated graphics chip and AMD’s dedicated graphics chip. Graphics mux (GMUX) is Apple’s unique design on 15” and 17” MacBook Pro 2010 to 2012 models.
Faulty flash video RAM will create a certain pattern of the abnormal video display. GPUs employ flash video RAM to speed up their graphic output. In this case, if you replace the GPU, you are getting rid of a perfectly good GPU in vain. If any of these power rails are missing or unstable this will cause the GPU to malfunction. The AMD graphics chip on 2011 MacBook requires four power rails (voltages): 1.0V, 1.5V, 3.3V and variable core voltage 0.75V to 0.9V. If it is faulty, you will see all sorts of the abnormal video display or a black screen. It is responsible for video output on the screen.
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