Something I noticed about the throughput values and it kinda makes sense too: Multiples of SMM count seem to work best for the -x parameter. 5 for 750 Ti, 13 for 970, 16 for 980. Only have 750s and a 970 to test with but 20 or 15 for 750 Ti and 13 or 26 for 970 seem to work well.
Isn't that usually the case?
Makes sense to me, just never really crossed my mind before. Still most if not every bit of ccminer code seems to just use a more or less arbitrary numbers for throughput. Probably wouldn't be a bad idea to always base it on SMM count one way or another.