Where are these "plug and play" external GPUs?

[yjchua95]

Why would you want to have Optimus when a computer is plugged in an outlet? I don't understand that.
If the rMBP was running on the battery it would make sense. I understand the way Optimus works is to save battery and be more efficient, but when the rMBP is plugged in what's the point of that.

I prefer the rMBP with the dGPU over the iGPU at this point. I myself have a rMBP with a 750m. Of course eGPUs may be something to consider in the future, but I am not going to pay over 1k $ for an external solution + graphic card. I don't see it reasonable.

Because some people do. But not me. I'm just highlighting it.

I've also got the 750M variant myself, but frequently run off a GTX 780 Ti in a Sonnet IIID for CUDA-accelerated software.