From what I gathered it could be numerous reasons:
- Bad configuration
- Internet connection
- pool
- hardware
Thing is, I just got my R9 290, Asus reference card with Hynix mem, and I've been playing around its settings for over a day now, but no matter what configuration I'm using, I get around 10% reject.
Currently I'm at 911/1250 with 1.023v, trying to get the best KH/w performance (and getting about 205w from wall for the card itself with 820KH/s with 750 WU).
Also, my rig is connected via wi-fi (no way to get cable there) and I'm mining at middlecoin.
Ideas?