Quote from: dan7733 on May 23, 2013, 03:02:15 AM

Hi Guys!

So I have a Powercolor 7970 (Non-ghz edition, but custom powercolor cooler) which seems to work great mining BTC, with speeds of 630 MH/s (when OC'd to 1125 MHz core clock) (using GUIminer).
The problem is that if I try to hash a scrypt cryptocoin (LTC, BTB.. etc.), using GUIminer-scrypt alpha, I am stuck at 320 kh/s!
Obviously something is wrong... I've tried changing many settings... but can't get higher than this speed.
My thread-concurrency is 8192, intensity is 13, gpu threads is 2, worksize is 256, and vectors is 1.

Thanks a lot!

-Dan

I had the same problem untill I lowered my core clock a bit and raised the memory clock on my 7950.
This is what fixed my problem:
I use shaders instead of thread concurrency on that particular card. Also make sure to watch out for HW errors. It should be HW:0 for zero errors or else you may be getting errors and just wasting electricity.
--shaders 1792 --intensity 13 --worksize 256 -g 2

Another thing to try is lower the core clock and raise the memory clock a bit and test it out I had to find a sweet spot. If I raised my memory clock too high my hash rate would go down so I lowered it until I hit a sweet spot.