Matrox TripeHead2Go---FPS takes a hit....Nick?

I just installed my Matrox TH2G with three 22" monitors. Looks stunning. However, my FPS have taken a major hit and I don't know why. If FSX is a CPU driven game, the monitor shouldn't have an affect on it, right? My CPU is a Q6600 at 3.275ghz. I was getting over 50FPS some of the time. Almost always above 30 until now. I am seeing 6-10 FPS on Level-D 767 and 10-12 on default.
I use a GTX 280 video card---one of the fastest available. I have it OC'd slightly. Do I need to adjust nHancer? The tech at Matrox said "oh, I see you are using nHancer. We don't support running with that installed"
hmmm, why?
I use a GTX 280 video card---one of the fastest available. I have it OC'd slightly. Do I need to adjust nHancer? The tech at Matrox said "oh, I see you are using nHancer. We don't support running with that installed"
hmmm, why?