So I wasn't pleased with my 3D Mark scores using eGPU on my 6,1. Decided that upping the ante to 12 Cores should help. Since this isn't mission critical I decided to save a few thousand and get an ES E5 2697 V2. I found a Youtube video and knocked it out in about 20 minutes. Much harder and many more screws then a 5,1 or a 4,1 with single CPU. The Dual CPU 4,1 will remain "most frightening" based on the ease of wrecking a CPU tray and/or CPUs. Something not covered in the video was that the stand offs on the thermal core unthreaded from the thermal core on 2 of the screws. Was very reminiscent of work I used to do switching CPUs on Cubes. Anyhow, booted right up with all 12 Cores recognized. Very doable by anyone with some handiwork experience. Be careful unsnapping connectors ! 20+ screws, all Torx in 3 or 4 different sizes. Unlike the GPUs, not a single one of them was a "Security" version. Perhaps Apple considers it so buried that home users won't bother. Nice engineering, would have been a great mid level Mac. Anyhow, will hopefully have some fun eGPU numbers soon.