- 2 gfx boards running in SLI.
- SLI output used with TH2G
- remaining 3 outputs for each monitor
This would work but it would require reboots to switch between the two modes of operation. Last I heard SLI drivers required a reboot when multimonitor was switched on, but it could be switched off without a reboot (or vice versa). It's true that you can't use SLI with multiple monitors.
- 2 gfx boards without SLI
- 1 output for TH2G while the rest for the individual monitors.
This is the simplest way to manage the situation. Take your primary card and run it's primary output to your triplehead unit. The secondary output on the primary card runs to a side monitor, and an output on the secondary GPU runs to the other side monitor. Presuming the secondary GPU is only used for 2D rendering, it can be low-end hardware.
It's possible to run 1600x1200 to a single monitor through the TripleHead
2Go, so this method requires only three GPU outputs, not four. This works on the desktop, at least; there have been some problems getting games to recognize 1600x1200.
- more than 2 gfx board if I want to run with SLI?
Since I have no direct experience with SLI I have no idea if this is possible or not, but I'm guessing additional GPUs wouldn't gain you anything because you'd probably still have to reboot.
Note that all of the above solutions require dual-input monitors for the side screens. You are best off using monitors with dual DVI inputs, but these are limited. If you have dual-DVI monitors, you'll want the Digital TripleHead
2Go. If not, you'll want the analogue, but then you have many fewer available resolutions and you lose the bezel management feature.
Two more thoughts:
1. If you are really set on a 30" in the middle and a 20" on the sides, you have to use SoftTH (are you thinking about rotating those 20" monitors?). Your best triplehead experience (meaning simplest and highest-performing) will come from a TripleHead
2Go and 3 5:4 monitors of equal dimensions.
2. A 30" monitor has a native res of 2560x1600, not 1600x1200. I don't know if you can push that res through a TripleHead
2Go onto a single screen. I think the three triplehead outputs are only single-link DVI...