It comes down to what you want to do and what the firmware on the device supports.
Typically you want to use .1x CPPM has the dictionaries already built in you will just need to enable them. (see screen shot)
Most device that were made in the past 5 years or so support 80x.1x, to MAC auth to captive portal failover. You will need to check the feature list of the firmware on the device.
The only issue that I have seen is that the HP switches are very strict on time. If the time on the switch and CPPM is off by just a second it will reject the auth request. In the testing that I have done we ended up turning off the time check on the switch for .1x.