> > > As far as I know, ATI cards can only drive more than two displays if
> > > you're using pure DisplayPort protocol. Using passive DP->DVI
> > > adapters
> > > you can only drive two monitors.
> >
> > ATI cards (in my case a 5770) are fine driving one monitor via an
> > active
> > DisplayPort->DVI adapter and two more by DVI directly for a total of
> > three. It's the configuration I am running right now.
>
> I wound up going with the ATI FirePro v4900 for triple head on RHEL6.
> I am using the DVI port, and two DisplayPort to DVI cables to drive
> three monitors.
>
> An interesting note... The AMD binary driver locked up the machine.
> Using the native RHEL driver, all three screens work, and I get
> accelerated X and compiz works great.
Out of curiosity, what kind of performance do you get? In something
rudimentary like glxgears.
Sorry for the delay in answering, I was travelling all week. It's not
spectacular, but certainly usable for my purposes. Like I said, I am not a
gamer, all I wanted was compiz to work on three heads. I just got:
[tcameron@case ~]$ glxgears
Running synchronized to the vertical refresh. The framerate should be
approximately the same as the monitor refresh rate.
298 frames in 5.0 seconds = 59.561 FPS
300 frames in 5.0 seconds = 59.903 FPS
Hum, how about 'export vblank_mode=0 ; glxgears'? Gaming aside, 2500fps
from a Nvidia NVS290 wasn't enough to run compiz on a 3200x1200 dualhead
smoothly enóugh for my taste. 9000fps from a Quadro 600 did the trick.
Both using Nvidia's proprietary driver.
--
Jussi
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