johnwhelan
Well-known member
I don't think you can change a GPU in an iMac. I have heard of external GPU boxes that plug in via USB. I would recommend looking into those, just make sure the GPU you use is supported in MacOS.
Matt
If you read through the last few messages you'll see that Thunderbolt is required and not only that it is a particular version of Thunderbolt not USB.
Cheerio John