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-   -   6106 driver UNDERclocks GeForce 6800 ?? (http://www.nvnews.net/vbulletin/showthread.php?t=32424)

glvertex 07-19-04 09:40 AM

6106 driver UNDERclocks GeForce 6800 ??
 
I just got a GeForce 6800 (NV40), installed the 6106 driver, and started testing.
I noticed immediately something is wrong with the performance.
So I checked with the nvclock utility what is going on.
Right after the X server starts up, the clocks are programmed to what they
should be. GPU = 400 , mem = 1100
But immediately after an OpenGL program starts up, the clocks drop to
GPU = 300 , mem = 600 !!
My synthetic fillrate benchmark program shows this clearly.
The (single , tiny texture) fillrate is below 1000Mpix/sec , while it was
1100Mpix/sec already on the GeForce4 Ti4600, and is around 1800Mpix/sec
on the 5900-U.

Anyone?

zander 07-19-04 10:21 AM

Re: 6106 driver UNDERclocks GeForce 6800 ??
 
I doubt that nvclock can be relied upon to report correct nv40 clocks. Are you using a standard 6800 or the Ultra variant?

Thunderbird 07-19-04 11:27 AM

Re: 6106 driver UNDERclocks GeForce 6800 ??
 
If nvclock from cvs is being used it should correctly display the clocks. It contains the same nv40 code as the opensource nv driver.

glvertex 07-20-04 03:22 AM

Re: 6106 driver UNDERclocks GeForce 6800 ??
 
I am using the ultra vriant.
I am using the nvclock from cvs (yesterday's). It correctly reports clocks.
I can tell this by how it reports the clocks _before_ an OpenGL app is started.
It reports GPU=400 and mem=1100

kmike 09-06-04 04:12 PM

Re: 6106 driver UNDERclocks GeForce 6800 ??
 
Interesting, sounds very much like downclocking due to overheating. I remember it is being used in windows drivers.. might be the case with linux drivers, too.

zander 09-07-04 02:03 AM

Re: 6106 driver UNDERclocks GeForce 6800 ??
 
I believe in this particular case, the problem turned out to be a bad VBIOS.

kmike 09-07-04 05:04 AM

Re: 6106 driver UNDERclocks GeForce 6800 ??
 
While we're on subject of downclocking - windows drivers have the feature of different clock speeds for 2D and 3D mode. Will this be available in Linux drivers?


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