I have a Mac mini "Core i7" 2.7GHz (Mid-2011) with the AMD Radeon 6630M. Two years ago, the typical problems with that model appeared and I had Apple replace the logic board at a cost of about $350. Now the problems have resurfaced (fans going crazy, hard to start, random shut downs, etc.) and that model is now vintage. The first logic board lasted 5 years and I expected the second to last as long, but it lasted less than 2.5 years. Since the problem is with the built-in GPU, I was wondering if an eGPU is a possible workaround. I wouldn't need a powerhouse GPU and I know I'm limited to what Thunderbolt 1 can deliver. I'm just wondering id an eGPU would fully bypass the built-in GPU and alleviate the problems.