I have been a fan of both Apple and this site. I read that MacVidCards supposedly claim that they can flash this video card so that the MacPro UEFI can be displayed on boot but I also read that this company has been known to ghost customers and unfortunately some never received their video cards back! I have both High Sierra and Mojave installed because I still have 32 bit programs and Catalina won't support 32 bit programs. You can however, try to unlock the extra shaders to basically turn it into a RX 560. This was ONLY possible on the 4GB RX 480 reference cards. No, you can't unlock memory on the RX 460. However, when booting my MacPro 2010 with 5.1 firmware, I see nothing until it displays the log in screen. Bios flashing to a 560 will unlock more cores and some 460's could be bios swapped to 4gb ram also. Dear friends, i have a HIS RX 460 iCooler OC 2GB with the following BIOS. Has anyone figured out how to flash a SAPPHIRE Radeon PULSE RX 580 8GB GDDR5 video card so that a MacPro 5.1 will display the Apple logo and startup progress bar and allow you to run options such as internet recovery or choose the startup disk boot options? I have a 2010 MacPro 5.1 and installed a SAPPHIRE Radeon PULSE RX 580 8GB GDDR5 video card which Apple recommends. RX 590 Series RX 580 Series RX 570 Series RX 560 Series RX 550 Series RX 480 Series RX 470 Series RX 460 Series R7.
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