Still playing with running 2 threads under Win8.1x64 w/R9 290's.
While I have noticed that -a 1 provides the best results on my gpu's,
so far running -t 0,0,1,1,2,2,3,3 hasn't shown much more c/m's BUT
it has shown a huge increase in CPU usage. Using a single thread per
GPU my CPU would sit around 2% utilization, however when running
two threads per GPU my CPU is now at 63% utilization. I suspect that
clpts is having internal conflicts when running 2 threads under Win8.1x64.
Just reporting findings to help the community out. MANY thanks NaN for
the awesome software (again)!