My 2x U1 antminer usb's are running at 0.5gh/s combined roughly, if I move them to a stable pool of another coin I get the normal 3.2gh/s combined, it's probably due to quick blocks & the ASIC's I think as I started up my GPU with a separate mining program and am getting 600mh/s so (0.6gh/s) the same as my usb Ants if not better.
My Antminer U3 does an average of 63GH's however same here it is only pushing 2 to 11 ghs. what is wrong with variance? Oh it seem difficulty is autmatically set at 16384 when connecting. I don't set the diff so Variance must.