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Title: 2 x 7970 problem, need help Post by: merred on December 19, 2013, 06:34:03 PM 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 Title: Re: 2 x 7970 problem, need help Post by: JCviggen on December 19, 2013, 06:38:50 PM 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. Title: Re: 2 x 7970 problem, need help Post by: merred on December 19, 2013, 07:08:15 PM Okay i'll try disabling ULPS first.
Title: Re: 2 x 7970 problem, need help Post by: merred on December 19, 2013, 07:13:32 PM However I don't understand your settings;
This is default: https://i.imgur.com/yGE7vvi.jpg The switch is possible on 1. Title: Re: 2 x 7970 problem, need help Post by: TribalBob on December 19, 2013, 07:22:36 PM However I don't understand your settings; This is default: https://i.imgur.com/yGE7vvi.jpg The switch is possible on 1. WTF, 5600 Memclock!?!?!? That CAN'T be right... Title: Re: 2 x 7970 problem, need help Post by: merred on December 19, 2013, 07:24:21 PM Maybe it's for 3GB? /3... = 1866 which is still a lot :/
Title: Re: 2 x 7970 problem, need help Post by: TribalBob on December 19, 2013, 07:29:54 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 Title: Re: 2 x 7970 problem, need help Post by: merred on December 19, 2013, 08:41:01 PM Title: Re: 2 x 7970 problem, need help Post by: merred on December 19, 2013, 08:56:58 PM Title: Re: 2 x 7970 problem, need help Post by: merred on December 19, 2013, 10:15:02 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 Title: Re: 2 x 7970 problem, need help Post by: Wipeout2097 on December 19, 2013, 10:20:20 PM 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 Title: Re: 2 x 7970 problem, need help Post by: jomay on December 19, 2013, 10:31:03 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 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 (https://en.wikipedia.org/wiki/GDDR5) Title: Re: 2 x 7970 problem, need help Post by: jomay on December 19, 2013, 10:33:15 PM 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. |
