You need to Google to get info but 1T is what all older AMD ran at and thats why they ran faster clock per clock than Intels at 2T, CPC= commands per clock, and AMD did more CPC's than Intel (was usually part of Mobo bios and you had to mod bios to change to 2T on some).
So CPC-On is 1T and CPC-off is 2T, I cant explain it really you best Google or Wiki it.