Trust me 14.7RC3 is best.
Then u are unlucky enough to have a "Locked" card.
Only recourse for u is vbios modding your card if u want to lower memclock to 150 and be able to do higher overclock on gpu.
Do the research on vbios modding ... there are pointers in this thread by myself, I hate repeating my self a hundred times that's why the info is in thread.
https://bitcointalk.org/index.php?topic=779598.msg9043545#msg9043545BTW I can still clock mem at 1625 via sgminer setting when I mine X11 or Neoscrypt with it ... just have to set it manual for them ...
Welcome to Extreme Diamond Mining LOL
I have 3 different 280x cards(dual,vapor,toxic). Strange to see all are locked. The same thing is that all are sapphire. Will try this vbios modding theese days.
Thank you for the support. I will leave the rigs for now at 22.3mh(1020/1500) /23.4mh(1070/1550) /24mh(1100/1600). Little tired last 2 days trying to config everything
) maybe I am wrong somewhere.