Yes it is fully portable, just need to mount it somehow. Power over usb and using express card slot.
>>62468211
But.. why?
Why not a T420 with discrete graphics?
>>62468236
x220 is smaller, its more of joke but it will be funny to have a gpu mounted on back. i can use anu gpu but power gets to be issue. Also will have to deal with 8 pin power if i use non fanless
>>62468256
GTX 950s don't use external power and you can mod one to be passively cooled if you have a large enough heatsink laying around.