maybe time for a new monitor

hi
i have just brought a new dell 8400 p4(3.4) 1gb ram and 850xt pci-x graphics card with latest drivers.
But all does not seem to well
I am still using my old tft monitor+tv must be nearly 3 years old could it be the monitor draging down the performance and what monitors (refresh rates) seem to be popular for flight sim
ta much for any help
i have just brought a new dell 8400 p4(3.4) 1gb ram and 850xt pci-x graphics card with latest drivers.
But all does not seem to well
I am still using my old tft monitor+tv must be nearly 3 years old could it be the monitor draging down the performance and what monitors (refresh rates) seem to be popular for flight sim
ta much for any help