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Title: 4 x Gigabyte 7970 problem when detaching monitor Post by: Tornate on June 18, 2013, 12:44:40 AM Guys, I got 2 problems with my 4 x 7970 Gigabyte OC mining rig ???
The 1st problem is when 4 cards running with attached monitor, the one with monitor cable connected is always 100 Khashes slower than others (at skrypt algorithm). It is always the nearest PCI-E slot to CPU fan on motherboard. https://i.imgur.com/5v7Ric0.png GPU 2 = 1st slot on the mother board (nearest to CPU Fan) I tried to swap the 1st (the one with monitor cable connected) with 2nd or 3rd cards. Nothing had changed: the card on which I replaced was still slower than 3 others.. Then I detached monitor and a second problem has arisen. I started remote desktop connection via RAdmin (also tried LogMeIn) to connect to my rig, then launched CGMiner. Here's what I got: https://i.imgur.com/Vq0tpDI.png GPU 2 = 1st slot on the mother board (nearest to CPU Fan) I assume the temperatures and fan speeds disappeared due to a mismatch of OpenCL and ADL devices (according to the following text at cgminer's start): https://i.imgur.com/nQvj08n.png Tried to search the forum, but did not find the solution how to "use the gpu map feature". My .bat script: Code: setx GPU_MAX_ALLOC_PERCENT 100 //sorry for my English, I would be very grateful, if someone PM'ed me pointing out my grammar/lexical mistakes. Title: Re: 4 x Gigabyte 7970 problem when detaching monitor Post by: BitCrawler on June 18, 2013, 08:29:44 AM Quote I assume the temperatures and fan speeds disappeared due to a mismatch of OpenCL and ADL devices (according to the following text at cgminer's start): I have the exact same problem. I'll let you know when I have found a solution. I have no clue about your other problems. My cards are always running at the same speed, with or without monitor. Even remote (ssh) has the same values. I did have some problems when I was running on Windows, but most of the time I could fix that by reinstalling the drivers. Title: Re: 4 x Gigabyte 7970 problem when detaching monitor Post by: pstudart on June 18, 2013, 01:25:27 PM are you running windows 7? i had this problem running windows 8 with the same setup you have except i had 3 gpu's
Title: Re: 4 x Gigabyte 7970 problem when detaching monitor Post by: pstudart on June 18, 2013, 01:32:19 PM Also i am really shocked your able to get 720 for 1 gpu I run at 1200 1400 and only get 640 per gpu.
Title: Re: 4 x Gigabyte 7970 problem when detaching monitor Post by: lazydna on June 19, 2013, 05:08:38 AM Also i am really shocked your able to get 720 for 1 gpu I run at 1200 1400 and only get 640 per gpu. brand of 7970 matters a lot, also, the higher clock/mem does not translate into higher hash for scrypt. you have to trial and error the right balance with thread concurrency and intensity to get the best settings. |
