Would it make sense to just get the base model m380 and get an Nvidia egpu hooked up seperately? Why pay apple tax for an AMD with so little info?
I've heard that eGPus can't actually use the imac's 5k screen...
Yeah it would only work with screen plugged to that. And since we didn't get TB3 we'd be seriously crippling the eGPU on the connection speed. Even if we had TB3 while it may support some current throughputs I think the new display card standards supposedly coming with Skylake (though they are lacking in iMac) would be again faster than TB3 and you'd end up loosing speed of the card again just on the connection