Huh.
You're sure you need 3DRenders=1 for that? The idea behind TripleHead2Go is to simulate several monitors as ONE big monitor. You have only one video-cable plugged into your PC and have a new setting available for resolution that widens the desktop over all connected monitors.
3DRenders is the option for several monitors support, though, where you link 2 or more Monitors directly to your PC.
The monitor from Alienware is also used as a single monitor. The signal then gets split up in the device itself, just like the TH2G technology.