Question for Those with TripleHead2Go and FSX

I have TripleHead2Go digital and am running FSX in Full Screen mode with a Nividia Geforce 7800 GT with 256MB video RAM. The question is are you running your setup in Full Screen or Windowed mode? And do you see much of a difference in FPS in either mode. Trying to decide if flying in Window mode will give me that much of a difference in FPS.My CPU is P4 3.6 with 4GB memory.Thanks in advance to all who reply.Bill