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Old 10-08-2016, 04:54 PM   #1
kneejo
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Nvidia Geforce GTX 970 15 degrees warmer under Linux Mint than on Windows


Hi all, my first post here.

I've recently discovered Linux Mint with Cinnamon desktop and I'm thinking about using it as my main desktop OS. I've noticed something that bugs me, as I can't seem to understand why it happens. My GTX 970 card is running approximately 10 to 15 degrees warmer under Linux Mint, than it does under Windows 8.1 when the system is idling on the desktop with no intensive programs running.

In windows the idle temperature doesn't exceed 40 degrees, but in Linux, right after the desktop starts, it's 45 degrees and slowly increases to about 55 degrees. It doesn't increase any further than that, unless I use GPU intensive software of course. The GPU fans will only kick in at around 60 degrees, on linux, as there is no good way to have a fan-curve like I have in windows with afterburner, except for using a script, which is a bit of a hassle. I've set a fan curve in afterburner in windows to slowly start spinning at around 40 degrees, but the card doesn't get hotter in idle computer use anyway. (the fan doesn't kick in actually)

I know these temperatures are nothing to worry about, but I'm a bit picky when it comes to keeping my hardware cool to increase the life of the components. This, and I'm simply curious as to why the Linux Mint desktop makes the card 15 degrees warmer in idle mode.

CPU temperatures and case and harddrive are similar to the temps in windows, it's just the NVIDIA card that gets a bit warmer. I'm using the 361.42 drivers in linux, and the 368.81 drivers in windows.

I have googled this issue but haven't found a specific answer, so I thought, let's get on this forum, perhaps someone else has noticed this difference in temperature as well, and perhaps someone knows what's causing it.

I can't seem to attach images, but my i7 4790K processor is barely in use when Idle, and the same goes for the GPU.

Increasing the case fan speed does decrease the temperature of the GPU in linux a bit, but I don't want to have them running at full speed when the PC is just idling.

Thanks in advance, and if there's no solution, no worries anyway. I might run into the answer some day.

Last edited by kneejo; 10-08-2016 at 04:56 PM.
 
Old 10-08-2016, 05:42 PM   #2
Emerson
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Do you have dual display?
 
Old 10-08-2016, 05:55 PM   #3
kneejo
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Yes, I do run a dual display setup.
 
Old 10-08-2016, 06:13 PM   #4
Emerson
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There is an issue with Linux driver and dual display. For some reason it never drops to the lowest frequency. There is a xorg.conf option to fix it, you better head over to nVidia forums with this question, and read nVidia documentation in /usr/share. Take the code below with a grain of salt, once upon time I had a nVidia card and I found this in my notes.

Code:
    Option          "RegistryDwords" "PowerMizerEnable=0x1; PerfLevelSrc=0x3333; PowerMizerDefault=0x3; PowerMizerDefaultAC=0x3"
 
Old 10-08-2016, 06:18 PM   #5
kneejo
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Ok, thanks. I had not looked into optimizing the settings for the GPU yet. I'll have a look into that.
In previous distros that I used I did always add some lines to the configuration files to have better performance.
With Mint I found a distro that's more to my liking, and it came with pretty solid configuration right out of the box.
 
Old 10-09-2016, 06:04 AM   #6
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I'm running a 970 myself and as I type it's idling at 39C whilst watching Netflix as it usually does. I am using the 367.44 driver though so it maybe worth trying a newer driver? I was using the driver downloaded from NVIDIA's website but I messed up in some way so it wasn't working correctly.
 
Old 10-09-2016, 04:58 PM   #7
kneejo
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Apparently the clock speed does go down to the lowest state when idle. The temperature drops to a minimum of 50 degrees. When watching HD movies it increases to 55, sometimes above 60 when also browsing on the second monitor. The fan then kicks in automatically and drops the temperature to below 60. I've just registered on the Nvidia forums and I'm looking through it to see if it's a known issue. If not I'll post a question and relay any useful information in this thread over here. I would prefer not to make a xorg.conf as the autoconfiguration seems to give me a satisfying result when it comes to the dual monitor setup and performance. The reason Mint has caught my attention was the really good automated install of the proprietary nvidia drivers, and no hassles with editing configuration files manually.. this is a thing I personally expect from a mature desktop environment. It's almost as sweet as windows when it comes to working out of the box, except for the slight increase in idle temperature.

like I already stated, it's not a big issue, as the card is made to handle 95 degrees max. Without afterburner in windows the card itself will only use the fans for cooling when it gets over 60 degrees, so apparently nvidia built it that way. Perhaps no one ever noticed the difference because it is rather small. Nevertheless, in case someone runs into my post over here and does know the answer, well, thatś only better. Thanks for the responses so far.

Edit: one post in the NVIDIA forums with one reply. Two people have noticed the same approximately 10 degrees difference, but no explanation or solution. My own theory is that windows is simply more efficient in graphics tasks. I've noticed this on my old pc when running dual boot with windows. It has always made me ditch linux and go with windows as on that pc I could use any performance boost I could find. On my current gaming rig I don't notice much of a difference, except when I look at the numbers. But that's simply because it's a beast of a computer. Still wondering if this theory is correct.

I'll try to get the more recent drivers installed and perhaps do a test with a lighter desktop environment. That last part used to be the solution on my old, slow pc. It simply couldn't run gnome or KDE without taxing the system to the max, so I went with the older version of MATE. I'll keep you all updated.

Last edited by kneejo; 10-09-2016 at 05:36 PM.
 
  


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