2 x 7970 problem, need help | Bitcointalksearch.org

jomay

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Activity: 167

Merit: 100

Quote from: merred on December 19, 2013, 03:56:58 PM

Or worse..

why don't you post the graphics card setup screen (whatever you get if you press 'G'). That would be way more informative.
Also, you may consider mining a "slower" coin such as litecoin for testing your HW setup. If the pool is too slow to supply work etc. you can also get low utilization IRRESPECTIVE of your HW setup.

jomay

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Activity: 167

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Quote from: merred on December 19, 2013, 05:15:02 PM

Quote from: TribalBob on December 19, 2013, 02:29:54 PM

Quote from: merred on December 19, 2013, 02:24:21 PM

Maybe it's for 3GB? /3... = 1866 which is still a lot :/

No, I realize now, it's because it's 1375 memclock x GDDR5 memory which equals to 5.5Gbps

Still dont get it..

AFAIK GDDR5 mem => 4 transfers per clock => real 1400MHz clock is "effectively" like 4x1400MHz = 5600MHz if there was one transfer per clock.
https://en.wikipedia.org/wiki/GDDR5

Wipeout2097

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Increase the intensity on the 1st card, 1 step at a time while it doesn't give HW errors.

If it does, use a lower thread-concurrency and try again.
If there are still problems, use now a higher thread-concurrency and -g 1

merred

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Activity: 126

Merit: 100

Quote from: TribalBob on December 19, 2013, 02:29:54 PM

Quote from: merred on December 19, 2013, 02:24:21 PM

Maybe it's for 3GB? /3... = 1866 which is still a lot :/

No, I realize now, it's because it's 1375 memclock x GDDR5 memory which equals to 5.5Gbps

Still dont get it..

merred

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Activity: 126

Merit: 100

Or worse..

merred

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Activity: 126

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Have tried different things...but no luck.

TribalBob

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Quote from: merred on December 19, 2013, 02:24:21 PM

Maybe it's for 3GB? /3... = 1866 which is still a lot :/

No, I realize now, it's because it's 1375 memclock x GDDR5 memory which equals to 5.5Gbps

merred

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Activity: 126

Merit: 100

Maybe it's for 3GB? /3... = 1866 which is still a lot :/

TribalBob

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Quote from: merred on December 19, 2013, 02:13:32 PM

However I don't understand your settings;

This is default:

The switch is possible on 1.

WTF, 5600 Memclock!?!?!? That CAN'T be right...

merred

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Activity: 126

Merit: 100

However I don't understand your settings;

This is default:

The switch is possible on 1.

merred

full member

Activity: 126

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Okay i'll try disabling ULPS first.

JCviggen

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Seems like the ASUS card is idling. I have a 7970 DCII from Asus and I remember it's finicky with regards to the slot it's in and the other cards it is with. Run the ASUS card in the first PCIe slot and the MSI in another.

Also, for settings

--gpu-engine 1000 --gpu-memclock 1725 --intensity 13 -g 2 --gpu-powertune 20 --thread-concurrency 8192

If your memory can do the clocks, that should give you 700 kh/s. If not, you'll crash. My asus card does about 1750 on the memory, no experience with MSI cards.

merred

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Activity: 126

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So i build a rig with 2 x 7970

Card one: MSI 7970 Lightning Boost Edition
Settings: 1080/1500 1138mV

Card two: ASUS 7970 DC2 TOP
Settings: Default

The MSI is giving around 650 khs
The asus is only giving 60 khs.

Catalyst 13.11 SDK 2.9
Win7 64 bit
Cgminer 3.7.2.
Installed MSI Afterburner
Asus GPUTweak

setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer --scrypt -I 13 --thread-concurrency 16320 -g 2 -w 512 --gpu-fan 50 -o x -u x -p x

Topic: 2 x 7970 problem, need help (Read 471 times)