My 27" machine happened to have the smaller MXM Type A heatsink instead of the bigger Type B standard on 27" machines, due to having shipped with a Radeon HD 4670 originally. The usual procedure, just like the famous Post #1 of this thread. Theoretically, any version of Windows that has drivers for the Polaris family GPUs (or maybe even anything that supports AMDVBFlashWin 2.93) should work - but when I tried booting a Legacy BIOS mode Windows 8.0 installation, all I got was a blank screen. Windows needs to be either the only boot option present, or set as the default, since you won't have access to ANY kind of boot picker right after swapping cards (not even OpenCore). Step 0: Have a way to boot Windows on the iMac (either on the internal drive, or in my case, plug in a hard drive from another computer - in my case, the drive with Windows 11 (EFI mode booting) from my Mac laptop (a 2009 year model MacBook Pro). (Other stuff needed, aside from iMac and new GPU: access to another computer with Linux or macOS (or a linux live boot disk), CH341A or similar EEPROM programmer, soldering iron, 1.5 or so foot long piece of 3 conductor wire (I used a piece of telephone cable, and removed one of its 4 wires), optionally a PCI Express 6-pin power header extension, and a toggle switch (SPDT or DPDT (single/double pole, double throw) ON-ON or ON-OFF-ON type)). Thanks so much, vB, and for all their amazing work that made this possible! (By the way, am I the first one to have done this successfully so far? surely someone's done it in the two years since it was first discovered - but it doesn't seem to be much talked about?) Bootscreen is working without an external monitor connected at all. In a nutshell, Nick D's EG2 VBIOS, corresponding iMac firmware mod, and iMac backlight wiring mod. IMac 11.3 (27" Mid 2010) AMD Radeon Pro WX4130 Boot Screen Mod Success!
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