7970 Mining Help/Optimization

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Hi everyone, Im getting into mining coins part time. Im currently mining litecoin in a pool at 587 kh/s, my GPU is the MSI 7970 Twin Frozr III (newegg page here: http://www.newegg.com/Product/Product.aspx?Item=N82E16814127732). I recently went and visited the litecoin hardware page and I saw that people with the 7970 were reaching upwards of 700 kh/s. I am just using the guiminer preset for my 7970, so I know I could tweak it to work better. But since I don't really know what all the options mean, or what would be the best for my hardware I hoped you guys could help me. I have the latest AMD drivers installed, the card is not OC'ed or modified in any way.

Do you think one of you could help me get the best performance out of my card? It would be greatly appreciated and I can send you some altcoins if you help .

Thanks in advance!

[redtwitz]

Without overclocking, you won't get very far. Scrypt performance depends heavily and in a non-obvious fashion on the GPU core and memory clocks.

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Without overclocking, you won't get very far. Scrypt performance depends heavily and in a non-obvious fashion on the GPU core and memory clocks.

My card can OC, I just have not done it

[redtwitz]

Of course it can. I took from your first post that you didn't intend to. My mistake.

I'm able to get decent speeds from my 7950s (up to 660 kh/s) with CGMiner. That should translate to 750 kh/s for a 7970.

Sadly, identical video cards in different systems require different settings (depending on OS, drivers and possibly hardware). Clocks are deep magic. I get 650 kh/s on one card at 1100 core / 1250 mem and 660 kh/s on another at 1125 core / 1500 mem. The second card won't perform as the first at the same clocks. Increasing the memory clocks of the first card actually slows it down.

These are the settings you have to tune:

• GPU memory speed. Higher should equal faster.
• GPU core speed. Optimal settings depends on memory speed.
• Thread concurrency. Higher is usually better. Should be a multiple of the number of shaders (2048). High TC requires high memory speed.
• Intensity. Higher is usually better.
• Worksize/Vectors/GPU threads. Set to 256/1/1 for 79x0 cards.