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Title: Strange as hell GPU temp problem Post by: CryptoCluster on July 22, 2013, 08:47:20 PM I have few 4 x 7970 rigs. All of them are hashing 720-750khs (litecoin currently). But on one of the rigs 3rd GPU runs a lot hotter than on others. 1, 2 and 4 GPU temps are 65-75 but 3rd GPU is 95-105!
I initially thought it is faulty GPU, but if you swap any card in that 3rd slot is starts running hot as hell. I have tried running it using riser as well as plugged directly into motherbord pcie. What might be the reason? Title: Re: Strange as hell GPU temp problem Post by: kuusj98 on July 22, 2013, 09:38:10 PM You may want to have a look at your VRM temps, you would not be the first one to blow one out...
May be that power is not distributed right, power always takes the shortest way... Title: Re: Strange as hell GPU temp problem Post by: CryptoCluster on July 22, 2013, 10:23:49 PM Card on problematic pcie is now underclocked and undervolted to maintain sub-70 temps. Sadly i cannot see the VRM temps in GPU-Z or in any other monitoring software (GPUs are Gigabyta GV-R797OC-3GD voltage locked).
Is it possible that some strange mobo hardware error interferes with VRM on GPUs overvolting it somehow? Title: Re: Strange as hell GPU temp problem Post by: kuusj98 on July 22, 2013, 10:27:57 PM Card on problematic pcie is now underclocked and undervolted to maintain sub-70 temps. Sadly i cannot see the VRM temps in GPU-Z or in any other monitoring software (GPUs are Gigabyta GV-R797OC-3GD voltage locked). Hmm, I dont think so, the clocks are handled by the gpu itself, so are the volts...Is it possible that some strange mobo hardware error interferes with VRM on GPUs overvolting it somehow? I suggest changing the PCI-e cables to that card, maybe the cable is faulty. Does seem strange anyway... Title: Re: Strange as hell GPU temp problem Post by: crazyates on July 23, 2013, 07:12:04 PM Does your 3rd slot have bad airflow?
Title: Re: Strange as hell GPU temp problem Post by: CryptoCluster on July 23, 2013, 08:39:22 PM Does your 3rd slot have bad airflow? Same as other slots. Today I have tried different PSU, nothing changed. Title: Re: Strange as hell GPU temp problem Post by: rascal777 on July 23, 2013, 11:40:57 PM I notice that in Cgminer that the Temps sometimes dont seem to line up with the Fan Control.
For example: One GPU will seem to run hotter than the average, and then there will be aonther GPU that is colder than average. So What I think is that as CGminer turns up the fan Rate to compensate for a hotter card it actually turns up a fan on the wrong card, thus now you see the cooler temp on another card. I have not found a solution for this yet. beginning efforts with gpu mapping havent seemed to work for me yet, or I haven't mapped them correctly. Title: Re: Strange as hell GPU temp problem Post by: Equate on July 24, 2013, 08:56:15 AM are you using risers ?
Title: Re: Strange as hell GPU temp problem Post by: rascal777 on July 25, 2013, 04:24:39 PM not question for me, but I am using risers
Title: Re: Strange as hell GPU temp problem Post by: CryptoCluster on July 26, 2013, 10:21:59 AM @Equate: Some cards are on riser (not powered risers), and some are connected directly into the mainboard.
3rd slot card was tested both ways, but it does not change temp readings. @rascal777: I have tried manually changing Fan speed to 100%, it does not help. Today I have used IR thermometer, just in case only readings in GPU-Z and cgminer are wrong, but they are not... Title: Re: Strange as hell GPU temp problem Post by: peonminer on July 26, 2013, 06:10:33 PM Does the card have a display plugged in? I have to run my display card lower than the rest.... Download CGWatcher and learn it. It'll save your rig when you're not around and even when you are.......................
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