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Old 07-16-05, 10:22 AM   #1
JaXXoN
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Location: Munich
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Default Slowdown Threshold is 0 C, limiting performance

Hi all!

Related to some previous posts, i have new insights why my Gainward
3500 PCX (7800GTX) is limited to 415 MHz GPU frequency (sometimes
even less):

"nvidia-settings -> Thermal Monitor" reports 0 C as "Slowdown Threshold".
"Core Temperature" is currently reported as 49 C.

So it looks like that the GPU is slowed down due to "overtemperature".

Apart from the fact that with an 6800GT/AGP nvidia-settings reports 120 C
as slowdown threshold, i guess it's pretty obvious that 0 C can't be correct.

An interim solution would probably be to purchase a deep freezer, but i
hope that the problem is fixible in software :-)

In this context, i tried to set NV_CTRL_GPU_CORE_THRESHOLD,
NV_CTRL_GPU_DEFAULT_CORE_THRESHOLD and
NV_CTRL_GPU_MAX_CORE_THRESHOLD to 60C using
NvCtrlSetAttribute() (retval=0), but when reading back the values
with NvCtrlGetAttribute(), then they are still 0C.

Any ideas? Thanks in Advance!

regards

Bernhard
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Old 07-28-05, 05:14 PM   #2
netllama
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Default Re: Slowdown Threshold is 0 C, limiting performance

This should be resolved in the next nvidia web driver release.
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Old 07-28-05, 05:23 PM   #3
JaXXoN
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Default Re: Slowdown Threshold is 0 C, limiting performance

Quote:
Originally Posted by netllama
This should be resolved in the next nvidia web driver release.
Thanks for the feedback. Does there exist an URL where i can read details?

regards

Bernhard
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Old 07-28-05, 05:38 PM   #4
netllama
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Default Re: Slowdown Threshold is 0 C, limiting performance

Sorry, there is not. However, I've verified this is resolved in newer unreleased driver builds.
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Old 07-28-05, 07:57 PM   #5
JaXXoN
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Default Re: Slowdown Threshold is 0 C, limiting performance

Quote:
Originally Posted by netllama
Sorry, there is not. However, I've verified this is resolved in newer unreleased driver builds.
Again, thanks for the feedback ... your answer makes me curious about
where to ge this "unreleased driver builds". Does there exist some kind
of beta driver testing program where i could enroll? Can't wait to get
the full performance out of my 7800GTX :-) Although glxgears FPS are
looking good, the card still lags behind at UT2004 and SPECviewperf
in comparison to my 6800GT,

regards

Bernhard
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Old 08-01-05, 01:21 PM   #6
JaXXoN
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Default Re: Slowdown Threshold is 0 C, limiting performance

Looks like others have same problem, too:

http://www.phoronix.com/scan.php?pag...item=230&num=9

Quote:
EDIT (23-June-05): We have now confirmed that the majority of the performance problem is indeed related to the 2D/3D switch. After tampering with nvidia-settings and the NVClock CVS for several hours, we have concluded that with the 1.0-7667 drivers once a 3D application launches that the system continues to stick to the 2D frequencies rather than their respective 3D speeds. Thus during game-play the VPU is currently running roughly 275MHz (VPU) and 1200MHz (MEM) at 1.2V rather than the 3D performance level of 430MHz (VPU) and 1200MHz (MEM) at 1.4V. We attempted to correct this problem by overclocking the 2D and also 3D speeds using CoolBits and the NVClock CVS, and taking other such steps, but so far we haven't achieved success. We can only hope right now that this is indeed the only factor causing the poor performance and that NVIDIA developers will be able to address this problem in a timely manner. Once we have access to any newer drivers or a fix we will be publishing new benchmark results for the 7800GTX.
Hopefully nvidia issues the new driver (as mentioned in another post in this thread), soon.

regards

Bernhard
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Old 10-10-07, 10:58 PM   #7
ramenite
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Default Re: Slowdown Threshold is 0 C, limiting performance

I'm using 100.14.19 with a 7900 GS GO, and I'm still having the same problem
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