Sorry a little off topic, but you should be getting a much higher hashrate than that! I have 6 Sapphire R9 290 (non-x) and get between 910-945/ea using kalroth's cgminer... I run them 24/7, don't really have much problems with them at all. Occasionally one gets sick, but CGWatcher just restarts it when that happens! Only when pushing 1050+ engine (I've run some at 1070 engine for many hours), 1500 memclock. 2 out of my 6 cards I can't push past 1025/1500 or they get sick within 5-10 minutes, but the rest run pretty well at 1050/1500 all day. Even at 1025/1500 those 2 still do 920+Kh/s
Please, your *.conf for Sapphire R9 290 may be *.bat or other bios...
Thanks.
Guys, I'm new here, so I may be wrong, but you sure it's the right thread? I mean how is it related to hashcows?
Looks like I inadvertently started this off topic discussion when asked about high reject rate, so I'm a bit nervous.