[rurounijones]

I have two nVidia cards in SLI powering 3 monitors.

Setup was pretty simple using the binary nVidia drivers on Kubuntu, 0 config file wrangling.

Now, having those three monitors in non-uniform geometries is something I wouldn't even consider tackling

[EDIT]

Kubuntu 12.04

All monitors in a single X Session and automatic application window sizing works as you would expect in KDE

(i.e. Maximising a window maximises to the current monitor only and being able to drag to right side of one monitor causes the window to use up half of the current monitor)

[eropple]

Can you get them all in the same X session? I've never tried SLI, I generally just upgrade to a beefier main card and use a second card to drive extra monitors. I have an HD6970 and an HD6450 on 4 monitors that work great under OS X (Hackintosh'd) and Windows and things go extremely sideways under Ubuntu.

[dripton]

I had 3 monitors / 2 Nvidia cards working fine in Kubuntu 11.04 and 12.04. All one X session. It was easy. But that was with uniform geometry. (I had 3 identical monitors.) Haven't tried non-uniform.

[rurounijones]

Ah well, Radeon with Crossfire under Linux is... yea, good luck. All I can say is nvidia in SLi works fine.