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Old 11-04-04, 01:57 PM   #1
inlikeFlynn
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Default 6800 Ultra temperature differences

This has been touched on before but I have some questions.
Systems info:

CPU: AMD64 FX-53 / Intel 3.4 GHz Pentium 4
MBoard: ASUS SK8V / Dell OU2424 Linked Intel 82801EB ICH5
Case Design: WaveMaster case / Dell XPS case
Video Card: Arctic Cooling NVSilencer 5 on an NVIDIA GeForce 6800 Ultra
Video Driver:1.0-6111 / 6.14.10.6177

Problem:

Linux:
Nvida-settings shows an idle core temp of 70 C
idle ambient temp of 45 C

gpu query shows a slowdown threshold of 115 C

Direct infrared monitoring of the NVSilencer 5
exhaust duct shows an idle temp of 43 C

Windows XP:
The thermal monitor shows an idle core temp of 57 C
idle ambient temp of 39 C
and a slowdown threshold of 115 C

Direct infrared monitoring of the NVSilencer 5
exhaust duct shows an idle temp of 35 C

Conclusions:
The GeForce 6800 Ultra is working harder in Linux than in Windows XP.

This is not a Linux kernel issue as tests were made on a 2.4 and a 2.6 kernel.
This is not an OS platform issue as tests were made on AMD and Intel.
These characteristics do not present themselves when testing a Quadro FX 3000G.

This is possibly a Linux driver issue in conjunction with the GeForce 6800 cards?

Concerns:
Is there a valid reason for the increase in temperature readings in Linux?
When running a graphics intensive program in Linux does this pose a possible performance problem? The gap between idle and slowdown temperatures is smaller in Linux than in Windows XP.
Our core developement is done in Linux and this seems strange. Can anyone shed some light on this?
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Old 11-04-04, 02:28 PM   #2
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Default Re: 6800 Ultra temperature differences

I don't think low power (idle) mode works in Linux, hopefully it will sometime.
In windows when 3D isnt in use, the card will consume less power, thus less heat.
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Old 11-05-04, 10:50 AM   #3
inlikeFlynn
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Default Re: 6800 Ultra temperature differences

Thanks Spyke, for your reply.

You may be right about the low power (idle mode) not working in Linux. It is curious that I did not see this with the Quadro though, the temperatures were spot on identical, with Linux and Windows.
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Old 01-05-05, 01:35 PM   #4
nyc_paramedic
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Default Re: 6800 Ultra temperature differences

I was searching the forums for answers to this issues. I have concerns about keeping my Linux desktop machine quiet when 3D is not being used.

I'm considering swicthing to Nvidia (6600 or 6800) for my Debian box.

Are there any other members with the same concerns? Any other posts by driver developers about including thermal managment in future Linux driver versions?
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Old 01-05-05, 01:41 PM   #5
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Default Re: 6800 Ultra temperature differences

There was a driver bug in 6111 which kept the temperature high. Further modern videocards make quite some nice even when the fan is turning slowly. There is a fanless Geforce6800 board from gigabyte which might be usefull if you don't want noise (GV-N68128DH ).
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Old 01-05-05, 01:54 PM   #6
nyc_paramedic
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Default Re: 6800 Ultra temperature differences

Thanx! Will check that out. I was also just reading the Arctic Coolers for the 6800 cards do wonders for noise!

Thanx again!
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Old 01-06-05, 03:09 AM   #7
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Default Re: 6800 Ultra temperature differences

Theres still a driver bug in 6629 that keeps the temp high, if you restart X. It works fine and the temps are low after the first X start after booting the machine up. Restart X, and the temp stays high. Only way to fix it is to reboot again.
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Old 01-06-05, 10:54 AM   #8
inlikeFlynn
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Default Re: 6800 Ultra temperature differences

Hello, the 6800 GT is louder than the 6800 Ultra in my experience. We have been using the NV Silencer5 from Arctic Cooling on these cards and it has done wonders for the noise.
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Old 01-09-05, 12:03 PM   #9
bms20
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Default Re: 6800 Ultra temperature differences

NV5 temperature

Guys, if you're running NV5 coolers, check the temperature response very carefully.

I put mine together, and tightened the screws down to what I thought was "reasonably tight". The problem is that running glx gears would heat the gpu from its idle temp of 65 deg to over 85 in about 5 seconds. (I stopped glx gears immediately to avoid further heating.)

After tightening the cooler down fully - to the point where the screws don't go any furhter; I now get an idle temperature of 51 deg C, and under load I see the board rarely go above 65 deg C when under load.

I used artic silver 5 for the thermal paste.

This cooler is great; I can think again in the presence of my computer, and its what the stock cooler should have been!
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