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Old 06-28-11, 03:13 PM   #1
sillium
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Default Option "BaseMosaic" with G80

Hi,

I'm running two GT8800 (or so, around 2-3 years old) in my current setup. The chipset is some G8x (i think G84, don't have the logs around atm).

At the moment I'm using Xinerama to get a triple head/one desktop experience. After I've read about BaseMosaic I wanted to give it a try as an alternative to Xinerama.
However, enabling BM only gives me an error about "card not supported". Is there anything I missed about BM? Do I need a SLI connection or Quadro cards?

Thanks a lot in advance!
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Old 06-28-11, 07:05 PM   #2
JaXXoN
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Default Re: Option "BaseMosaic" with G80

Code:
/usr/share/doc/NVIDIA_GLX-1.0/README.txt:
[...]
It is also supported on Quadro FX 380, Quadro FX 580 and all G80 or
higher non-mobile NVS cards.
[...]
I think this refers to "G80 based *NVS* cards" such as the NVS 290,
but not to consumer G80 cards. However, this would imply that
Mosaic is also available for i.e. NVS 420 and and NVS 450 with four
outputs, each (couldn't yet easily figure that out from the public information,
so far). Would be nice if somebody official could confirm this.

So 4xx NVS might be an alternative to video splitter such as the
TH2G - but again this is just another prove that the limitation of
SLI Mosaic to Quadro is just a marketing issue. Dare you have
more then two LCDs without purchasing a bunch of Quadros or
at least an NVS! :-)

SCNR

Bernhard

Last edited by JaXXoN; 06-28-11 at 07:09 PM. Reason: clarification
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Old 06-29-11, 02:47 PM   #3
sillium
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Default Re: Option "BaseMosaic" with G80

Quote:
Originally Posted by JaXXoN View Post
Code:
/usr/share/doc/NVIDIA_GLX-1.0/README.txt:
[...]
It is also supported on Quadro FX 380, Quadro FX 580 and all G80 or
higher non-mobile NVS cards.
[...]
I think this refers to "G80 based *NVS* cards" such as the NVS 290,
but not to consumer G80 cards.
Hm, then i must've overread the "implies NVS cards" part.

Quote:
Originally Posted by JaXXoN View Post
However, this would imply that
Mosaic is also available for i.e. NVS 420 and and NVS 450 with four
outputs, each (couldn't yet easily figure that out from the public information,
so far). Would be nice if somebody official could confirm this.

So 4xx NVS might be an alternative to video splitter such as the
TH2G - but again this is just another prove that the limitation of
SLI Mosaic to Quadro is just a marketing issue. Dare you have
more then two LCDs without purchasing a bunch of Quadros or
at least an NVS! :-)

SCNR

Bernhard
Well, if it would work with a quad NVS, I'd think about buying one. On the other hand i'm getting pretty tired of this. Last time I tried the open source ATI drivers they also did not work properly. What's more a proper replacement for Xinerama isn't in sight either. Maybe I should just forget about tripple monitor aweness and get a Mac or so (oh no, I said it..).

Best wishes,

Jochen
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Old 06-29-11, 03:24 PM   #4
JaXXoN
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Posts: 910
Default Re: Option "BaseMosaic" with G80

Quote:
Originally Posted by sillium View Post
What's more a proper replacement for Xinerama isn't in sight either.
Maybe you like to have a look at the Zotac GeForce GTX 460 3DP:
It has an on-board video splitter so that you can run up to three displays
off one GPU (which makes live *much* easier with nvidia-linux):

http://www.nvnews.net/vbulletin/showthread.php?t=162763

Also, I can strongly recommend the Matrox TripleHead2Go video splitter:
you can have up to 3x 1920x1200 or 4x 1680x1050 with one TH2G or
up to 4x 1920x1200 or 6x 1680x1050 with two TH2Gs attached to
the two DVI outputs of single GPU card:

http://www.nvnews.net/vbulletin/showthread.php?t=126134
http://www.nvnews.net/vbulletin/showthread.php?t=106517
http://www.nvnews.net/vbulletin/showthread.php?t=133740

This are quite length threads, but they will include everything
you need to know on this topic.

However, the drawback is that those TH2Gs are pretty expensive
($300 each), so an NV450 might be an interesting alternative,
especially because it seems that you can scale those with
BaseMosaic to up to 24 LCDs in a single PC with 6 PCIe slots.
(yet again, it would be nice if an nvidia representative could
confirm that).

BTW.: In combination with TH2Gs, it would even be possible
to extend that to 72 displays - we already had requests like that
in this forum but we had to scare them away with Xinerama
and/or DMX.

BTW.#2: QuadroPlex is connected through a PCIe extender card, so
it should be possible to attach six QP 2200 D2 to a single PC (again with
six PCIe slots), then applying BaseMosaic for 24 LCDs or attaching
24 TH2Gs for 72 LCDs. Such a setup would only be around $90.000 :-)

regards

Bernhard
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Old 06-30-11, 06:29 PM   #5
JaXXoN
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Default Re: Option "BaseMosaic" with G80

Just stumbled over this one:
http://www.nvnews.net/vbulletin/showthread.php?t=163652

So at least on Solaris, BaseMosaic seems to work with NVS450
so chances are good it working for Linux, too. However, hopefully
not with the problems as detailed in the link.

regards

Bernhard
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Old 07-04-11, 03:45 AM   #6
sillium
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Default Re: Option "BaseMosaic" with G80

Quote:
Originally Posted by JaXXoN View Post
Just stumbled over this one:
http://www.nvnews.net/vbulletin/showthread.php?t=163652

So at least on Solaris, BaseMosaic seems to work with NVS450
so chances are good it working for Linux, too. However, hopefully
not with the problems as detailed in the link.

regards

Bernhard
Hi Bernhard,

thanks for your detailed answers. They made me investigate the market for Nvidia
cards again. With BaseMosaic there are several interesting options for my use
case. I need/want DVI-D (Dual Link) which effectively rules out DisplayPort
since I'd need an (quite) expensive active converter for this. What's more I
want a passively cooled card to keep the noise level down.

Currently I am looking at a PNY QuadroFX 380, GeForce 9500 GT, 256MB GDDR3, 2x
DVI (VCQFX380-PCIE-PB) which is actively cooled though. However, it takes only
34W at max so i might exchange the active cooler with a passive one.

I'll try that as soon as time permits and report back here.

Regards,

Jochen
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