GTX 680 + linux, What is the max pixelclock?

[Xevious]

I was wondering if the maximum pixel clock is still 400 Mhz with the GTX 680 like with older cards?

I heard some people on windows were able to exceed 400 Mhz on windows. I am currently running 2560x1440 @ 400 Mhz @ 100.4 Hz and was curious to see if I could get it up to 125 Hz with a gtx 680.


Currently with my gtx 470 it works @ 400 Mhz:

(II) Apr 06 12:36:16 NVIDIA(0):   Validating Mode "2560x1440":
(II) Apr 06 12:36:16 NVIDIA(0):     2560 x 1440 @ 100 Hz
(II) Apr 06 12:36:16 NVIDIA(0):     Mode Source: X Configuration file ModeLine
(II) Apr 06 12:36:16 NVIDIA(0):       Pixel Clock      : 400.00 MHz
(II) Apr 06 12:36:16 NVIDIA(0):       HRes, HSyncStart : 2560, 2592
(II) Apr 06 12:36:16 NVIDIA(0):       HSyncEnd, HTotal : 2612, 2692
(II) Apr 06 12:36:16 NVIDIA(0):       VRes, VSyncStart : 1440, 1443
(II) Apr 06 12:36:16 NVIDIA(0):       VSyncEnd, VTotal : 1448, 1480
(II) Apr 06 12:36:16 NVIDIA(0):       H/V Polarity     : +/+
(II) Apr 06 12:36:16 NVIDIA(GPU-0):     BestFit Scaled and BestFit AspectScaled are identical;
(II) Apr 06 12:36:16 NVIDIA(GPU-0):         collapsing BestFit AspectScaled.
(II) Apr 06 12:36:16 NVIDIA(GPU-0):     BestFit Centered and BestFit Scaled are identical;
(II) Apr 06 12:36:16 NVIDIA(GPU-0):         collapsing BestFit Scaled.
(II) Apr 06 12:36:16 NVIDIA(GPU-0):     BestFit Centered         2560x1440
(II) Apr 06 12:36:16 NVIDIA(GPU-0):       Horizontal Taps        0
(II) Apr 06 12:36:16 NVIDIA(GPU-0):       Vertical Taps          0
(II) Apr 06 12:36:16 NVIDIA(GPU-0):       Base SuperSample       x4
(II) Apr 06 12:36:16 NVIDIA(GPU-0):       Base Depth             32
(II) Apr 06 12:36:16 NVIDIA(GPU-0):       Distributed Rendering  1
(II) Apr 06 12:36:16 NVIDIA(GPU-0):       Overlay Depth          32
(II) Apr 06 12:36:16 NVIDIA(0):     Mode is valid.

But dies @ 401 Mhz:

(II) Apr 07 00:38:37 NVIDIA(0):   Validating Mode "2560x1440":
(II) Apr 07 00:38:37 NVIDIA(0):     2560 x 1440 @ 101 Hz
(II) Apr 07 00:38:37 NVIDIA(0):     Mode Source: X Configuration file ModeLine
(II) Apr 07 00:38:37 NVIDIA(0):       Pixel Clock      : 401.00 MHz
(II) Apr 07 00:38:37 NVIDIA(0):       HRes, HSyncStart : 2560, 2592
(II) Apr 07 00:38:37 NVIDIA(0):       HSyncEnd, HTotal : 2612, 2692
(II) Apr 07 00:38:37 NVIDIA(0):       VRes, VSyncStart : 1440, 1443
(II) Apr 07 00:38:37 NVIDIA(0):       VSyncEnd, VTotal : 1448, 1480
(II) Apr 07 00:38:37 NVIDIA(0):       H/V Polarity     : +/+
(II) Apr 07 00:38:37 NVIDIA(GPU-0):     BestFit Scaled and BestFit AspectScaled are identical;
(II) Apr 07 00:38:37 NVIDIA(GPU-0):         collapsing BestFit AspectScaled.
(II) Apr 07 00:38:37 NVIDIA(GPU-0):     BestFit Centered and BestFit Scaled are identical;
(II) Apr 07 00:38:37 NVIDIA(GPU-0):         collapsing BestFit Scaled.
(WW) Apr 07 00:38:37 NVIDIA(GPU-0):     BestFit Centered ViewPort 2560x1440 exceeds hardware
(WW) Apr 07 00:38:37 NVIDIA(GPU-0):         capabilities.
(WW) Apr 07 00:38:37 NVIDIA(0):     Mode is rejected: Unable to construct hardware-specific
(WW) Apr 07 00:38:37 NVIDIA(0):     mode timings.

Also the driver doesn't like this monitor's EDID. Not a huge deal but the vid card seems to be OK as it correctly scales in BIOS and stuff to native resolution (monitor has no scaler):

(II) Apr 07 00:40:29 NVIDIA(GPU-0): Skipping Power Connector Check.
(WW) Apr 07 00:40:29 NVIDIA(GPU-0): The EDID read for display device DFP-0 is invalid: the
(WW) Apr 07 00:40:29 NVIDIA(GPU-0):     checksum for EDID version 1 extension is invalid.
(--) Apr 07 00:40:29 NVIDIA(GPU-0):
(--) Apr 07 00:40:29 NVIDIA(GPU-0): Raw EDID bytes:
(--) Apr 07 00:40:29 NVIDIA(GPU-0):
(--) Apr 07 00:40:29 NVIDIA(GPU-0):   00 ff ff ff ff ff ff 00  23 2f 9b 04 00 00 00 00
(--) Apr 07 00:40:29 NVIDIA(GPU-0):   28 15 01 03 a5 3c 22 78  22 6f b1 a7 55 4c 9e 25
(--) Apr 07 00:40:29 NVIDIA(GPU-0):   0c 50 54 00 00 00 01 01  01 01 01 01 01 01 01 01
(--) Apr 07 00:40:29 NVIDIA(GPU-0):   01 01 01 01 01 01 56 5e  00 a0 a0 a0 29 50 30 20
(--) Apr 07 00:40:29 NVIDIA(GPU-0):   35 00 55 50 21 00 00 1a  00 00 00 fc 00 44 55 41
(--) Apr 07 00:40:29 NVIDIA(GPU-0):   4c 2d 44 56 49 0a 20 20  20 20 00 00 00 fc 00 0a
(--) Apr 07 00:40:29 NVIDIA(GPU-0):   20 20 20 20 20 20 20 20  20 20 20 20 00 00 00 fc
(--) Apr 07 00:40:29 NVIDIA(GPU-0):   00 0a 20 20 20 20 20 20  20 20 20 20 20 20 01 11
(--) Apr 07 00:40:29 NVIDIA(GPU-0):   ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
(--) Apr 07 00:40:29 NVIDIA(GPU-0):   ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
(--) Apr 07 00:40:29 NVIDIA(GPU-0):   ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
(--) Apr 07 00:40:29 NVIDIA(GPU-0):   ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
(--) Apr 07 00:40:29 NVIDIA(GPU-0):   ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
(--) Apr 07 00:40:29 NVIDIA(GPU-0):   ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
(--) Apr 07 00:40:29 NVIDIA(GPU-0):   ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
(--) Apr 07 00:40:29 NVIDIA(GPU-0):   ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
(--) Apr 07 00:40:29 NVIDIA(GPU-0):
(II) Apr 07 00:40:29 NVIDIA(0): NVIDIA GPU GeForce GTX 470 (GF100) at PCI:132:0:0 (GPU-0)
(--) Apr 07 00:40:29 NVIDIA(0): Memory: 1310720 kBytes
(II) Apr 07 00:40:29 NVIDIA(0): Board ID: 0xcc16
(II) Apr 07 00:40:29 NVIDIA(0): Chip SKU: 275
(II) Apr 07 00:40:29 NVIDIA(0): Chip SKU Mod: 0
(II) Apr 07 00:40:29 NVIDIA(0): Project: 1025
(II) Apr 07 00:40:29 NVIDIA(0): Project SKU: 0006
(II) Apr 07 00:40:29 NVIDIA(0): GPU RAM Type: GDDR5
(--) Apr 07 00:40:29 NVIDIA(0): VideoBIOS: 70.00.21.00.70
(--) Apr 07 00:40:29 NVIDIA(0): Found 2 heads on board
(II) Apr 07 00:40:29 NVIDIA(0): Supported display device(s): CRT-0, CRT-1, DFP-0, DFP-1,
(II) Apr 07 00:40:29 NVIDIA(0):     DFP-2
(II) Apr 07 00:40:29 NVIDIA(0): Bus detected as PCI Express
(II) Apr 07 00:40:29 NVIDIA(0): Detected PCI Express Link width: 8X
(--) Apr 07 00:40:29 NVIDIA(0): Interlaced video modes are supported on this GPU
(II) Apr 07 00:40:29 NVIDIA(0): DFP scaling is supported on this GPU
(II) Apr 07 00:40:29 NVIDIA(0): SPS  : 4
(II) Apr 07 00:40:29 NVIDIA(0): User configuration of GPU PowerMizer is supported
(II) Apr 07 00:40:29 NVIDIA(0):
(II) Apr 07 00:40:29 NVIDIA(0): Mode timing constraints for  : GeForce GTX 470
(II) Apr 07 00:40:29 NVIDIA(0): Maximum mode timing values   :
(II) Apr 07 00:40:29 NVIDIA(0):     Horizontal Visible Width : 32767
(II) Apr 07 00:40:29 NVIDIA(0):     Horizontal Blank Start   : 32767
(II) Apr 07 00:40:29 NVIDIA(0):     Horizontal Blank Width   : 32767
(II) Apr 07 00:40:29 NVIDIA(0):     Horizontal Sync Start    : 32767
(II) Apr 07 00:40:29 NVIDIA(0):     Horizontal Sync Width    : 32767
(II) Apr 07 00:40:29 NVIDIA(0):     Horizontal Total Width   : 32767
(II) Apr 07 00:40:29 NVIDIA(0):     Vertical Visible Height  : 32767
(II) Apr 07 00:40:29 NVIDIA(0):     Vertical Blank Start     : 32767
(II) Apr 07 00:40:29 NVIDIA(0):     Vertical Blank Width     : 32767
(II) Apr 07 00:40:29 NVIDIA(0):     Veritcal Sync Start      : 32767
(II) Apr 07 00:40:29 NVIDIA(0):     Vertical Sync Width      : 32767
(II) Apr 07 00:40:29 NVIDIA(0):     Vertical Total Height    : 32767
(II) Apr 07 00:40:29 NVIDIA(0):
(II) Apr 07 00:40:29 NVIDIA(0): Minimum mode timing values   :
(II) Apr 07 00:40:29 NVIDIA(0):     Horizontal Total Width   : 8
(II) Apr 07 00:40:29 NVIDIA(0):     Vertical Total Height    : 5
(II) Apr 07 00:40:29 NVIDIA(0):
(II) Apr 07 00:40:29 NVIDIA(0): Mode timing alignment        :
(II) Apr 07 00:40:29 NVIDIA(0):     Horizontal Visible Width : multiples of 1
(II) Apr 07 00:40:29 NVIDIA(0):     Horizontal Blank Start   : multiples of 1
(II) Apr 07 00:40:29 NVIDIA(0):     Horizontal Blank Width   : multiples of 1
(II) Apr 07 00:40:29 NVIDIA(0):     Horizontal Sync Start    : multiples of 1
(II) Apr 07 00:40:29 NVIDIA(0):     Horizontal Sync Width    : multiples of 1
(II) Apr 07 00:40:29 NVIDIA(0):     Horizontal Total Width   : multiples of 1
(II) Apr 07 00:40:29 NVIDIA(0):
(--) Apr 07 00:40:29 NVIDIA(0): Connected display device(s) on GeForce GTX 470 at PCI:132:0:0
(--) Apr 07 00:40:29 NVIDIA(0):     DFP-0
(--) Apr 07 00:40:29 NVIDIA(0): DFP-0: 330.0 MHz maximum pixel clock
(--) Apr 07 00:40:29 NVIDIA(0): DFP-0: Internal Dual Link TMDS
(--) Apr 07 00:40:29 NVIDIA(0): DFP-0: Native FlatPanel Scaling is not supported
(--) Apr 07 00:40:29 NVIDIA(0): DFP-0: DFP modes are not limited to 60 Hz refresh rate
(--) Apr 07 00:40:29 NVIDIA(0): DFP-0: DFP is not internal to notebook
(--) Apr 07 00:40:29 NVIDIA(0):
(--) Apr 07 00:40:29 NVIDIA(0): --- EDID for DFP-0 ---

AFIK it works fine in windows as most of the people with the same monitor as me are running windows and I would think if EDID was not being read properly (resolution/modelines) it would be even more problematic on windows.

[Licaon]

for my information, what benefit does this bring?

[Xevious]

Originally Posted by Licaon

for my information, what benefit does this bring?

Higher refresh rate.

[Licaon]

and what LCD panel supports this higher refresh rate?

[Xevious]

Originally Posted by Licaon

and what LCD panel supports this higher refresh rate?

The one that I am using.

[ellson]

I'm considering purchasing a GTX680 for stereoscopic viewing using a 120Hz monitor. Is > 400MHz pixelclock required for this?

[Licaon]

Originally Posted by ellson

I'm considering purchasing a GTX680 for stereoscopic viewing using a 120Hz monitor. Is > 400MHz pixelclock required for this?

You can use a 120Hz monitor but you can't use 3D Stereo under Linux with consumer grade ( read GTXxxx ) cards, a Quadro is needed, yes, it's not like on Windows, please call nvidia and complain! no really call them!

...the 400Mhz clock you can ignore

Originally Posted by Xevious

The one that I am using.

oh, well even if it's a secret you can tell me it's name, i won't tell anyone, i promise!

[Xevious]

Originally Posted by ellson

I'm considering purchasing a GTX680 for stereoscopic viewing using a 120Hz monitor. Is > 400MHz pixelclock required for this?

>400 Mhz is only needed for 120Hz @ 2560x1440. A normal 1920x1200 (or below) monitor does not need that high of bandwidth for 120hz/3d.

Originally Posted by Licaon

You can use a 120Hz monitor but you can't use 3D Stereo under Linux with consumer grade ( read GTXxxx ) cards, a Quadro is needed, yes, it's not like on Windows, please call nvidia and complain! no really call them!

...the 400Mhz clock you can ignore


oh, well even if it's a secret you can tell me it's name, i won't tell anyone, i promise!

It is a YAMAKASI CATLEAP Q270 SE. However the only the older ones were capable of super high refresh rate.

[Licaon]

Originally Posted by Xevious

It is a YAMAKASI CATLEAP Q270 SE. However the only the older ones were capable of super high refresh rate.

sheesh, nice monitor

[Xevious]

So, can anyone from nvidia answer my question?

[Spyke]

Xevious, what is your modeline and override settings?

I have the same monitor and its a 2B (older version) as well.

The driver keeps bitching at me about 330 being the max...

EDIT: Got it, was missing an option, but 400 seems to be the hard max on a GTX 480.

Okay if someone from NVIDIA can give a straight answer that the max pixel clock isn't hardcoded in the drivers and a GTX 680 can indeed allow >400, then please reply. It sounds hardcoded if people in Windows can take 4x0 series cards past 400 slightly...

[Xevious]

Yeah I am woried that this is a driver limitation so even upgrading to a gtx 680 wont get me past 400 Mhz.