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Author Topic: HD 6870 with 11.1a STILL NEED HELP  (Read 1544 times)
celcoid
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January 11, 2012, 08:11:29 PM
 #1

Can someone point me in the right direction for the best drivers/miner/tags for a HD 6870.

I have rolled back to 11.11 so I can have SDK 2.5

but now I get 265Mhash at stock clocks 900/1050

and 280Mhash at 950/300

I was getting 300Mhash+
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P4man
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January 11, 2012, 08:28:22 PM
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All he needs to know is what clocks it can achieve. Its not like one 6870 is faster than any other at a given clock

celcoid
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January 11, 2012, 08:34:11 PM
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I would still like to test it...
P4man
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January 11, 2012, 08:35:47 PM
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cgminer is probably the fastest miner. Good luck setting it up quickly. bitminter is usually within 1 or 2%, its only a click to start it, see my signature.

celcoid
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January 11, 2012, 08:41:00 PM
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cgminer is probably the fastest miner. Good luck setting it up quickly. bitminter is usually within 1 or 2%, its only a click to start it, see my signature.

What about the best driver version?
celcoid
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January 11, 2012, 11:12:17 PM
 #6

Bump
jake262144
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January 12, 2012, 12:34:44 AM
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I'm happily mining using 11.11 x 2.5 combo. Got nothing bad to say about it.

I suggest you start messing around with vector width settings (vectors 1, 2, or 4) and work sizes (64, 128, or 256).
vectors 2, worksize 128 is a very universal combination.
A couple of my 6770 cards are doing great at vectors 2, worksize 256 while some other oddball mix of cards prefer vectors 2, worksize 64.

Do some benchmarking and fine tuning, you'll get your performance back.
Whichever settings you test, make sure to let cgminer run at least for an hour before writing down the results as conclusive.

EDIT:: P4, are you a couple of miners down or did you point them away from bitminter? Some new pool being tested?
celcoid
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January 12, 2012, 01:34:01 AM
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I'm happily mining using 11.11 x 2.5 combo. Got nothing bad to say about it.

I suggest you start messing around with vector width settings (vectors 1, 2, or 4) and work sizes (64, 128, or 256).
vectors 2, worksize 128 is a very universal combination.
A couple of my 6770 cards are doing great at vectors 2, worksize 256 while some other oddball mix of cards prefer vectors 2, worksize 64.

Do some benchmarking and fine tuning, you'll get your performance back.
Whichever settings you test, make sure to let cgminer run at least for an hour before writing down the results as conclusive.

EDIT:: P4, are you a couple of miners down or did you point them away from bitminter? Some new pool being tested?

Thanks a bunch I'm actually in the process of trying to sell it. I'm at 309Mhash Cheesy
jake262144
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January 12, 2012, 01:51:59 AM
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...I'm actually in the process of trying to sell it on here if you know anyone looking for a 6870 for $125 in BTC let me know...
That's not how it's done! Try here: https://bitcointalk.org/index.php?board=51.0
This way, your offer will be in scope of anyone looking for a new card.
deepceleron
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January 12, 2012, 06:07:39 AM
 #10

Can someone point me in the right direction for the best drivers/miner/tags for a HD 6870.

I have rolled back to 11.11 so I can have SDK 2.5

but now I get 265Mhash at stock clocks 900/1050

and 280Mhash at 950/300

I was getting 300Mhash+

The answer you are looking for is: that even after reinstalling the 11.11 driver, you likely still are using the SDK 2.6's OpenCL which reduces performance. Multiple threads have been created where I answered this, it's almost like the search function doesn't work on the forum...:

https://bitcointalk.org/index.php?topic=54693.msg651989#msg651989
https://bitcointalk.org/index.php?topic=57784
https://bitcointalk.org/index.php?topic=56885

P4man
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January 12, 2012, 07:58:44 AM
 #11

EDIT:: P4, are you a couple of miners down or did you point them away from bitminter? Some new pool being tested?

No, I just rented a rig and that agreement expired. But I have some more cards on their way, Ill be back to 2 GH permanently next week.

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