Bog standard MXM A. I could have put an Nvidia Quadro T2000 in with a little case modification - cutting away to trim the stumps that hold the card in place - but the M2200 will do for now as it'll allow me to use latest pytorch without manual compilation and fiddling about (I already did spend weeks manually compiling for the K2100 and it was a giant pita as it limits versions of other libraries). The card was about 1/3-1/4 the price of a T2000.
I already have another laptop with an RTX 3060, but thought I may as well upgrade this chunky beast of a laptop as I still use it daily.
Good stuff. I always thought the image was being used in a nefarious way but haven't had time to investigate