It's not Logic plain & simple...
As Ben said, the way to run
Pro Tools is to leave a processor available so in ur case, 1 is what u wanna use...
PT is real time, not block based like
Logic so u can't & shouldn't compare because they're both what they are...
WELCOME TO PT
ps. I don't kno why u aren't seeing the other processor but it could be an OS thing...
But thatz to ur advantage anyway...