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Old 02-13-06, 05:53 PM   #1
jeffcorbets
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Default One Machine, Two nVidia Cards?

Hi,

As part of our simulator lab setup, we have one machine that has a Quadro FX 4400 graphics card that is driving two flat panels. We want to be able to connect this machine to the operator's console as well, but we only have a single PCI Express slot (being used by the 4400) and no AGP slot. Thus, we are forced to use a PCI video card.

To keep the driver overhead low, we think we are going to stick with an nVidia-based product. Our current choice is the Quadro4 280 NVS (link below).
http://www.cdw.com/shop/products/specs.aspx?EDC=585040

My questions are:

Most importantly, is the Quadro4 280 NVS (PCI) card supported by the Linux driver? Looking at the supported products list, I see the Quadro4 200 NVS and the Quadro 200 NVS listed separately. The Quadro 280 NVS (PCI) is listed as being supported, but I am not familiar enough with nVidia products to know if this is the same as the Quadro4 280 NVS (PCI)?

Second, with two cards in the machine, will we see a performance degradation on the Quadro FX 4400 card because of the less-capable card (be it nVidia or otherwise)? The question boils down to are the graphics cards completely independent of each other?

Thanks!
Jeff Corbets
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Old 02-13-06, 06:15 PM   #2
chunkey
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Default Re: One Machine, Two nVidia Cards?

Hmm, is it really _impossible_ to use a SLI Mainboard (with 2 PCI-Express Slots) and two Quadros FX 4400?
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Old 02-13-06, 06:27 PM   #3
jeffcorbets
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Default Re: One Machine, Two nVidia Cards?

Quote:
Originally Posted by chunkey
Hmm, is it really _impossible_ to use a SLI Mainboard (with 2 PCI-Express Slots) and two Quadros FX 4400?
Well... the application is a flight simulator lab. What we have are three machines networked together that provide the simulation. Two machines have Quadro FX 4400s, one machine drives the digital projector for the outside world, and the other drives two LCD panels that form the instrument panel display. A third machine, with a Quadro FX 3400 (for no apparent reason ) drives the flight dynamics.

Unfortunately, the machines were ordered shortly before I arrived so I didn't have any say over the specs...

Jeff Corbets
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Old 02-13-06, 06:48 PM   #4
JaXXoN
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Default Re: One Machine, Two nVidia Cards?

Hi!

Concerning performance degration: i once had a 7800GTX
and a 6600 running a tripple head setup (two displays in
twinview mode attached to the 7800GTX and one display
attached to the 6600, then bound together with xinerama):
each card performed "independly", means when i started
a glxgears window and placed it on one of the displays the
7800GTX was driving, then the number of FPS has been the
same as if the 6600 wasn't there at all (about 16000FPS).
Same for the 6600 (about 4000FPS). When moving the
glxgears "between" the two graphics cards (means i.e.
one half of the window is displayed on an LCD attached
to the 7800GTX and the other half is displayed on an LCD
attached to the 6600), then the FPS ranged from 4000FPS
to 16000FPS, depending on how much each card has to render.

So unless your application spans the whole multihead setup
(which i understand is not the case) you shouldn't note any
performance degration.

regards

Bernhard

Last edited by JaXXoN; 02-14-06 at 05:42 PM.
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