Hello ,
The 6 series does have various TekExpress compliance modules but it does not have one for PCIE. Formal gen2 compliance testing requires a real-time bandwidth of 12 GHz. The 6 series maximum bandwidth is 10 GHz.
While the 6 series isn't recommended for compliance for this reason, you can still see an eye with manual measurements of the jitter and eye analysis package, 6-DJA.