Originally Posted by Krusher33
I had it set to 18 per someone's suggestion.
Clean utility normal and safe mode, installed 13.5b, installed sdk 2.7.
The 18 suggestion was someone thinking it was a 7950...
Ok, where's the rest of the settings in your bat? Or is that all?
Try changing --thread-concurrency (if you haven't yet) and remove --shaders (if you do have them there)
Start at --thread-concurrency 8192, then go up in 256 intervals till the miner fails to start or you get HW (HW should always be 0)
Then go back down till you find the optimal value, with the highest hash rate and the highest WU: value (the one in the top right corner...531 in your case)
Once you do that you can start changing the memory speed keeping that same ratio. That means maintaining the core speed as a 0.57 multiple of ram speed.
Go in 10mhz intervals...you should find the sweet spot easily. Go down, not up
The ram chips have a set of timings that change with the different speeds.
Sometimes faster ram mhz will perform worse than slower mhz cause of auto timing settings. Think of it like 2400mhz cl11-11-11-28 vs 2133mhz cl9-10-10-21-1t. 2133mhz will perform best.