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Author Topic: Is anyone able to replicate this guys 6990 results of 432-455Mh/s per GPU??  (Read 674 times)
burningrave101
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July 07, 2011, 09:17:15 PM
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The last couple of days I've been tweaking trying to get the highest Mh/s I can on my 6990 and after trying a number of different overclock settings, extra flags, every kernel tweak I could find and even several different miners and pools I still don't get anywhere near the 432-455Mh/s at 910Mhz that this guy is showing he's able to achieve here:

http://forum.bitcoin.org/index.php?topic=25798.0

So I'm just wondering what it is I'm missing that he found in order to get that additional ~27-50Mh/s at only 910Mhz core speed. Is anyone else here able to replicate his Mh/s or anywhere close to it?

I'm using the exact same settings as him and this is what I'm getting at 910Mhz core clock per GPU:

Operating System:
Windows 7 X64
Aero Theme Disabled

Drivers:
11.7 preview

Software:
GUIminer: Miner(Phoenix with 3% patch to phat kernal), Flags(-k phatk VECTORS BFI_INT AGGRESSION=7 WORKSIZE=128)

GPU Clocks:
Core: 910
Mem: 840

Cooling:
60% Fan speed on cards

Temps:
Hottest: 72c
Coolest: 71c

Hash Rate:
405 MH/s per GPU
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wizang
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July 07, 2011, 10:21:20 PM
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Try underclocking the memory as much as you can. You might be able to edge out a bit more by doing that. Also are you using the exact same OS/drivers as this other person?
burningrave101
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July 08, 2011, 01:01:28 AM
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Try underclocking the memory as much as you can. You might be able to edge out a bit more by doing that. Also are you using the exact same OS/drivers as this other person?

Yeah I've already tried lowering the memory clocks further as well as raising them higher and it doesn't really effect the hash rate. Lowering the memory speed only really seems to improve temps more than anything else. Also his guide suggests using Windows 7 x64 and Catalyst drivers 11.6 or 11.7 which I've tried both.
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July 08, 2011, 01:29:04 AM
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The last couple of days I've been tweaking trying to get the highest Mh/s I can on my 6990 and after trying a number of different overclock settings, extra flags, every kernel tweak I could find and even several different miners and pools I still don't get anywhere near the 432-455Mh/s at 910Mhz that this guy is showing he's able to achieve here:

http://forum.bitcoin.org/index.php?topic=25798.0

So I'm just wondering what it is I'm missing that he found in order to get that additional ~27-50Mh/s at only 910Mhz core speed. Is anyone else here able to replicate his Mh/s or anywhere close to it?

I'm using the exact same settings as him and this is what I'm getting at 910Mhz core clock per GPU:

Operating System:
Windows 7 X64
Aero Theme Disabled

Drivers:
11.7 preview

Software:
GUIminer: Miner(Phoenix with 3% patch to phat kernal), Flags(-k phatk VECTORS BFI_INT AGGRESSION=7 WORKSIZE=128)

GPU Clocks:
Core: 910
Mem: 840

Cooling:
60% Fan speed on cards

Temps:
Hottest: 72c
Coolest: 71c

Hash Rate:
405 MH/s per GPU

i have about the same results like you - on linux - catalyst 11.4 - sdk 2.4 - poclbm (phatk)
bigcoiner
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July 08, 2011, 01:45:08 AM
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How are you keeping the temperatures in the 70c?  Mine goes up to like 90c +.  If I increase the Core to 880mhz, my temp keeps on going up. 
burningrave101
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July 08, 2011, 05:11:13 AM
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How are you keeping the temperatures in the 70c?  Mine goes up to like 90c +.  If I increase the Core to 880mhz, my temp keeps on going up.  

Lower the voltage to 1.12v if your using the BIOS switch to enable 880/1250 clocks and then lower your memory clocks as far as you can until you see a drop in Mh/s. After that it's just up to getting better airflow to the cards. My room is pretty warm with ambients ranging in the 75-80F department but I have a Silverstone FT02 case with the side panel off and a tower fan blowing in the direction of my 6990.
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