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post #41 of 197
Quote:
Originally Posted by Krusher33 View Post

At 1200/1600? I thought at those speeds it should 700? In fact I was topping out at 650 on guiminer.

Your core speed is too high...You HAVE to keep a 0.57 ratio between mem and core.
1600*0.57=core speed
post #42 of 197
Quote:
Originally Posted by ivanlabrie View Post

Quote:
Originally Posted by Krusher33 View Post

At 1200/1600? I thought at those speeds it should 700? In fact I was topping out at 650 on guiminer.

Your core speed is too high...You HAVE to keep a 0.57 ratio between mem and core.
1600*0.57=core speed
Not doubting you but what is that based on? Or why?
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post #43 of 197
Quote:
Originally Posted by Krusher33 View Post

Not doubting you but what is that based on? Or why?

Experience, not mine alone, but the whole scrypt mining community.
Try it wink.gif
post #44 of 197
Thread Starter 
I found my sweet spot at 1150/1500 with script mining that is.
    
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post #45 of 197
Quote:
Originally Posted by Krusher33 View Post

Not doubting you but what is that based on? Or why?

Trial and error.

Scrypt in general is extremely memory intensive, and something about GCN based cards prefers even more bandwidth than most. A 7970 works best at a very high ratio of memory to core speed because of the number of shaders it's got relative to it's memory clock. Many scrypt hashers are running their 7970s in excess of 1800 memory.
Edited by Blameless - 6/7/13 at 7:43pm
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post #46 of 197
Quote:
Originally Posted by ivanlabrie View Post

Quote:
Originally Posted by Krusher33 View Post

Not doubting you but what is that based on? Or why?

Experience, not mine alone, but the whole scrypt mining community.
Try it wink.gif

Quote:
Originally Posted by Blameless View Post

Quote:
Originally Posted by Krusher33 View Post

Not doubting you but what is that based on? Or why?

Trial and error.

Scrypt in general is extremely memory intensive, and something about GCN based cards prefers even more bandwidth than most. A 7970 works best at a very high ratio of memory to core speed because of the number of shaders it's got relative to it's memory clock. Many scrypt hashers are running their 7970s in excess of 1800 memory.

Well I tried 910/1600 and it dropped to 485 average. Now I'm trying 1200/1700 and getting 600.
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post #47 of 197
Thread Starter 
Quote:
Originally Posted by Krusher33 View Post


Well I tried 910/1600 and it dropped to 485 average. Now I'm trying 1200/1700 and getting 600.

Try 1150 / 1600 and 1150 / 1500 I used to get about 660 kh/s which each card with those settings.
    
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post #48 of 197
Quote:
Originally Posted by Krusher33 View Post


Well I tried 910/1600 and it dropped to 485 average. Now I'm trying 1200/1700 and getting 600.

Can your card do over 1700mhz mem? Try to get the maximum mem clock that is stable and then multiply that by 0.6...that should be your core value.
You also have to play with thread concurrency values to get best efficiency.
Start with 8192, and work your way up in 256 increments till cgminer crashes. Then go back a notch and see if hash rate is worse than the notch below that. If it is go down yet another 256 notch.
You have to remove --shaders if you're using that value too.
post #49 of 197
I'm using after burner to do the overclocking by the way. If I recall, I was able to do 1800 memory clock in a bench but it missed pixels everywhere.

Per Hokies suggestion:

1200/1600 was doing 610 prior to changes.
1150/1600 was doing 606 after 15 minutes.
1150/1500 dropped to 585 after 15 minutes.

Trying 1080/1800 per Ivan's suggestion.

I don't know how to change the concurrency?
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post #50 of 197
Quote:
Originally Posted by Krusher33 View Post

I'm using after burner to do the overclocking by the way. If I recall, I was able to do 1800 memory clock in a bench but it missed pixels everywhere.

Per Hokies suggestion:

1200/1600 was doing 610 prior to changes.
1150/1600 was doing 606 after 15 minutes.
1150/1500 dropped to 585 after 15 minutes.

Trying 1080/1800 per Ivan's suggestion.

I don't know how to change the concurrency?

You won't be rendering picture so no worries with clocks...just monitor HW in cgminer. Should be zero, same as R= should be 2% or less of your total A= (accepted shares after a few minutes)

In cgminer's bat file, change the number after --thread-concurrency like I described.
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