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Title: Hash rate swinging a lot Post by: iLLmAtiCiAn on September 11, 2011, 02:49:07 PM Hey guys, I have two miners where the hash rates stay mostly constant but on one miner the hash rate changes a lot. Gpu utilization keeps going from like 99% to like 80% and all the way in between.
Title: Re: Hash rate swinging a lot Post by: Bitcraft on September 12, 2011, 01:45:25 PM Might be a weak power supply. What are the specs (all of them) for your rig?
Title: Re: Hash rate swinging a lot Post by: iLLmAtiCiAn on September 13, 2011, 06:22:34 AM I don't think it's the power supply unless it's faulty. I have a hx850 powering a 5870 and a 5850 with an amd sempron + 1gb ddr3 ram stick
Title: Re: Hash rate swinging a lot Post by: iLLmAtiCiAn on September 13, 2011, 06:23:04 AM I mean i have an elitexstream 800w powering 3x 5850 just fine on my other rig
Title: Re: Hash rate swinging a lot Post by: iopq on September 13, 2011, 08:06:04 AM what miner are you using? What is the temperature like on the cards?
Title: Re: Hash rate swinging a lot Post by: iLLmAtiCiAn on September 13, 2011, 02:29:12 PM using guiminer opencl, temperature looks fine, it's 78-80 max on 5850 and below 70 max on 5870
Title: Re: Hash rate swinging a lot Post by: RyNinDaCleM on September 14, 2011, 04:06:14 PM In GUIminer, What flags do you use?
Title: Re: Hash rate swinging a lot Post by: turquoise9955 on September 17, 2011, 09:36:06 AM using guiminer opencl, temperature looks fine, it's 78-80 max on 5850 and below 70 max on 5870 Could still be wrong thoughTitle: Re: Hash rate swinging a lot Post by: DeathAndTaxes on September 27, 2011, 08:59:19 PM Check VRM temps. When load varies like that it could be thermal throttling due to overheating VRM.
A utility like GPU-Z will show you VRM temps. Note something which only shows a single temp isn't useful. There are 8 different temps on each graphics card (12 if you have dual GPU card). The VRM temp (called VDDC in GPU-Z is the one to look at. |