X11 hd 7950 x3. Ive been playing with xintensity.
I am also using cgwatcher. That way you can see shares per second against the work utility.
For me. 1792 shaders * X= 1792x120=215,040 threads.
I incrementally go up and watch shares and WU.
My hash changes 10-30khs but is deceiving. Hash goes down a bit but shares rise.
Cgwatcher you can see shares in real time.
I am running 2 threads per gpu. Work 256.
X=120 so that is X60 per thread.
1100 on the clocks 1500 memory.
3x hd7950 = 8.9 mh/s
2.96 mh per card .
My pool sees 9.25-10 mh/s
WU is .120+
.040 per card
According to this chart.
I:13 = 8192 threads
I:14 = 16384 threads
I:15 = 32768 threads
I:16 = 65536 threads
I:17 = 131072 threads
I:18 = 262144 threads
I:19 = 524288 threads
I:20 = 1048576 threads
1792x120=215040 or about I 17.75ish.
Will test more. Have a great day.