geerdt (OP)
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December 18, 2013, 09:52:09 AM |
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I have set up a mining computer that functions well with one GPU. However, when I add a second GPU, the machine crashes. When going down to basic settings, cgminer recognizes both cards and seemingly starts mining, but total hashrate is the same as the hashrate for one card. Moreover, shutting down either card does not have any effect at all. The temperature of GPU1 stays close to room temperature as well. Does anyone have an idea what can be wrong?
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Once a transaction has 6 confirmations, it is extremely unlikely that an attacker without at least 50% of the network's computation power would be able to reverse it.
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LightningBlade
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December 18, 2013, 03:05:49 PM |
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What is your power supply wattage?
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geerdt (OP)
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December 18, 2013, 09:57:12 PM |
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750w. But this is not the problem. I had a spare PSU activated and connected to just the second card. No difference.
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vm1990
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December 19, 2013, 12:10:52 AM |
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stick them in crossfire. also your gpu temp should be way above room temp. might have a faulty card
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geerdt (OP)
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December 19, 2013, 10:12:56 PM |
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You sure about crossfire? I heard that would make hashrate suffer. However, if both GPU's start working to near capacity that's better than nothing I guess.
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tichwich85
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December 20, 2013, 01:30:06 AM |
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x-fire is no longer needed, cards run perfect without it and as fast (or faster)
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DrG
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December 20, 2013, 11:48:50 AM |
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Don't do crossfire.
Do you have enough system RAM? If you don't CGMiner will crash and disable the device.
Make individual batch files for each card and launch separately. Pain in the butt but easier to control for debugging.
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geerdt (OP)
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December 20, 2013, 02:57:52 PM |
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8GB ram seems to be sufficient for this task. I'll do as you suggest and we'll see what happens. Thanks for the thinking everyone.
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lilfooker2469
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December 28, 2013, 12:09:05 AM |
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I am also have the same problem trying to run 2 r9 280x.
i have 6 gigs of ram. i was lead to beleive that i would only need 4 gigs of ram to run up to 6 cards. is this not true? if so how mucg ram should i have?
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Oldminer
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December 31, 2013, 01:26:49 PM |
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Check your PCI-I slot settings in the BIOS
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geerdt (OP)
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January 10, 2014, 12:30:27 AM |
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The solution (of sorts): once I switched from Xubuntu to BAMT there was no longer any problem. The reason for this totally eludes me, but I am somewhat of a Linux noob and getting a miner up and running was taxing my abilities by itself.
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Roman1974
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January 12, 2014, 01:48:40 AM |
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similar problem, any help
Running one r9 280x ok about 750 speed, i install second r9 280x, one run in 750 but second imposible more than 67.
i run with cgminer 3.7.2 and catalyst driver 13.10, i update catalyst to 13.12, i tried cgminer 3.7.0 and 3.5, and i tried many configs but always the same
im using windows 8.1
Im not using crossfire, and not active in software.
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Roman1974
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January 13, 2014, 09:22:41 PM |
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Working ok ,thanks
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howardb
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January 27, 2014, 02:51:26 PM |
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Working ok ,thanks
It's normal to share what your solution was. |
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