Thanks! Great find!

Can you please tell us your other command line settings too?

 --thread-concurrency 16384 -g 1 -i 19

win7 12.10 64 bit drivers and whatever sdk comes with it.
i've tried 12.8 and it doesnt work well for me. neither do any of the 13's.

Nice work.
But some problem/question..

I have 2x7970
I use CGminer, not reapter and i need use half(desktop use) (like -I15) GPU [0-0 Tahiti] but GPU [0-1 Tahiti] going to half GPU usage if I set -I15 first(0-0) GPU. Speed is halfing GPU 0-0 but usage 0-0 is 97-99% .
Everything what i try, only gpu 0-1 usage going down..

Some fix or ideas?

Sorry 4 bad english:

Use it in windows command console (cmd.exe) or just use my guiminer (which doesn't permanently alter your registry/environmental variables)

Guide updated for how to use high thread concurrencies in cgminer.

Hi. Im a mining noob. How many LTC can I expect to get in 24h with a 7970?

Don't forget about undervolting your GPUs, I finally got around to it with my 7970 x2 .

Running 1000/1660 , 8192, 2 gpu threads for 680 kh/s. (any higher concurrency with the new cgminer is causing issues for me, probably because that system only has 2gb system ram).

Undervolted to 1.025 dropped 150 watts at full load (kill-a-watt from outlet).


The new cgminer works great in my other system though with a 7850, getting 380kh/s with concurrency 12000, 1100/1300. Whereas the old cgminer with 8192 only got me 330kh/s at the same clocks and power usage.

I think the 7850s are the best bang for the buck now, I paid $150 for the card, came with 2 games that I sold for $50, so total investment $100 for 380kh/s, at 100 watts, payback is under 60 days.

Just using trixx, slowly lowering core voltage until the system becomes unstable. I found 1.025 to work the best with my 7970s.

https://i.imgur.com/VNgaEQg.png

Is it normal that my computer gets really slow during mining?

I'm using reaper for a HD7850, about 600 300 kH/s.

And I've disabled CPU mining.

My RAM usage is only at 35%, I have 8 GB.

I was hoping I could mine and work at the same time...