[vaibhav purwar]

I am using surface Pro 4, I would like to check, up to what GB SD card, Surface pro 4 can support.

[QuentinJ]

micro SDXC (up to 2TB theoretically, card up to 200GB currently available)

[yeewiz]

I'm using the SanDisk 200GB microSD card. No problem whatsoever. I don't even notice any access speed issues.

[Davidz]

Isn't there a 128 GB limit?

[xandros9]

not really, it's mostly on paper since 128 was probably the max available at launch.

[QuentinJ]

it supports SDXC.
SDXC standard goes up to 2TB, however those cards are not available yet. If they wrote 2TB, people might keep asking them where to get them and say they are doing false advertising as it is not currently possible to support 2TB. Specs pages don't tend to be updated as larger capacities become available