I have this same issue.
Another question:
RX 580-8 rig. On 1st card of rig. When monitor connected and trying to look video on youtube or play any videofile (even in bad quality f.e. 320p) video playback goes with freezes. On all other miners (Claymore, TR, PM) video plays without problems during eth mining.
My 6800XT by default treats the GPU as one, so my result is abysmal in comparison. I am still not sure if I fully understand this result.
81Mhs but it shows 2 gpus (0 and 1) so is it only 40mhs each....
Somebody got more info on what is going on there?
Ok..i see it is treating it (the miner sft) as two separate gpus with 8gb each....makes more sense