Digital Sidecar I2C bus speed

Can anyone tell me if the Digital Sidecar supports Fast Mode I2C?

The ADXL accelerometer works with either. NXT sensors are regular mode only.

We bought an I2C color sensor (not NXT compatible) but I’m not having any luck programming it and it turns out to only support I2C in Fast Mode. Since I can’t find any reference to Fast Mode for the Digital Sidecar/C-RIO I suspect it’s not supported but I’m looking for confirmation.