So this vBios mod depends on OCLP for full use: Unfortunately, a Mac_GOP does not fit within the 128 KB size limit. That’s just enough space for header information, vga_bootloader information, data and command tables, and finally a modestly sized GOP. The vbios is the typical ATOMBIOS used by AMD which is limited by its BAR to 128kb. We can see here that the Vbios base is a DELL revision BR46629.001 Image: Size(61440 Bytes), Type(EFI Image) <- PCI option ROM/UEFI recognized! Image: Size(65536 Bytes), Type(Legacy Image) <- legacy vbios recognized! Product Name : DELL Miramar Amethyst XTGL A1 G5 4GB 128Mx32 300e/150m MXM (OPM) AMDMTLBronzeDriver is used to initialize its Metal capability. This type of GPU is actually used internally in an iMac (Retina 5K, 27 inch, late 2015), Model Identifier: iMac17.1, and therefore has native MacOS support! It uses AMD9000Controller.kext and AMDTongaGraphicsAccelerator – RadeonX4000.kext which also runs natively on MacOS. I will continue to post in the 2011 thread as new data and findings emerge to make it more compatible there. I’m going to focus on older iMacs because 2011 iMacs have an issue with NVRAM reboot causing a “black screen”. Therefore, the card is based on the third generation of the GCN architecture (GCN 1.2) and supports DirectX 12 (FL 12_0). It’s based on the same Tonga chip as the AMD Radeon R9 M390X and has comparable clock speeds. In the PC world, the AMD FirePro W7170M is a high-end graphics card for mobile workstations. This thread will chronicle my efforts to get the AMD card to work on these class machines.