Expresscard version in Sony TTs (for USB 3)

Does anybody know which Expresscard version the Vaio TT has? I'm about to get a two-port USB 3 Express card on Amazon and would like to know if we have Expresscard version 1.0 or 2.0.
The latter is supposed to offer the maximum 5Gbps throughput for USB 3, while the older generation is supposed to be limited to half that speed.

I have the Vaio VGN-TT25 (1.4Ghz Core 2 Duo).
Thanks a lot.