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Title: problem with second R9 280x added to working mining PC in cgminer Post by: geerdt on December 18, 2013, 09:52:09 AM 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?
Title: Re: problem with second R9 280x added to working mining PC in cgminer Post by: LightningBlade on December 18, 2013, 03:05:49 PM What is your power supply wattage?
Title: Re: problem with second R9 280x added to working mining PC in cgminer Post by: geerdt on December 18, 2013, 09:57:12 PM 750w. But this is not the problem. I had a spare PSU activated and connected to just the second card. No difference.
Title: Re: problem with second R9 280x added to working mining PC in cgminer Post by: vm1990 on December 19, 2013, 12:10:52 AM stick them in crossfire. also your gpu temp should be way above room temp. might have a faulty card
Title: Re: problem with second R9 280x added to working mining PC in cgminer Post by: geerdt on December 19, 2013, 10:12:56 PM 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.
Title: Re: problem with second R9 280x added to working mining PC in cgminer Post by: tichwich85 on December 20, 2013, 01:30:06 AM x-fire is no longer needed, cards run perfect without it and as fast (or faster)
Title: Re: problem with second R9 280x added to working mining PC in cgminer Post by: DrG on December 20, 2013, 11:48:50 AM 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. Title: Re: problem with second R9 280x added to working mining PC in cgminer Post by: geerdt on December 20, 2013, 02:57:52 PM 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.
Title: Re: problem with second R9 280x added to working mining PC in cgminer Post by: lilfooker2469 on December 28, 2013, 12:09:05 AM 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? Title: Re: problem with second R9 280x added to working mining PC in cgminer Post by: Oldminer on December 31, 2013, 01:26:49 PM Check your PCI-I slot settings in the BIOS
Title: Re: problem with second R9 280x added to working mining PC in cgminer Post by: geerdt on January 10, 2014, 12:30:27 AM 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.
Title: Re: problem with second R9 280x added to working mining PC in cgminer Post by: Roman1974 on January 12, 2014, 01:48:40 AM 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. Title: Re: problem with second R9 280x added to working mining PC in cgminer Post by: Roman1974 on January 13, 2014, 09:22:41 PM Working ok ,thanks
Title: Re: problem with second R9 280x added to working mining PC in cgminer Post by: howardb on January 27, 2014, 02:51:26 PM Working ok ,thanks It's normal to share what your solution was.Title: Re: problem with second R9 280x added to working mining PC in cgminer Post by: fluffy1926 on January 27, 2014, 04:33:00 PM best site I've found with a full explanation of all those 7950 mystery command lines and how they work http://www.bitcointrading.com/forum/bitcoin-miners/cgminer-cpugpu-miner/msg761/#msg761
fixed all my set up issues. |