Can I ask for best settings for r9 280x - 1200/6700mhz? thanx.
1100/1500 works best on my R9 280x - Gigabyte Windforce 3GB models.
higher memory clock = quickly SLOWER mining, higher core doesn't give any better hashrate, lower clocks are a slower taperoff on hashrate.
Other cards may vary, especially other models or other manufacturer cards.