280x: 750kh/s (4 percent reject)
7950: 675kh/s (3.3 percent reject)
5s total hash: 1.420M
WU: 1398 shares/min
Total Rejected: 3.22 percent
EDIT: I had been running the 7950 using Intensity 19 on different pools, but it had double the amount of rejects as the 280X. I think shifting it to 2 threads @ 4xintensity (equal to 13 Intensity) has dramatically reduced its rejects, but its hard to be sure since Terk was busy fixing his pool at the same time I was busy tweaking my rig.
I have just tried 2 threads but it crashes after few mins saying thread 6 still exists killing it off. What does this mean?
When running 2 threads, my 280x likes 8192 thread concurrency while my 7950 likes 16384 thread concurrency. I don't really understand it. Check to make sure you aren't maintaining your 1 thread TC which would likely be too high?