2048x2048??? I'm confused. That's a square screen :D Or, 2 of my monitors stacked one on top of the other...
I use a Sony GDM-FW900, a 24" 16:10 Widescreen CRT (eats LCD image quality for lunch, but it's huge, 92lbs)
I run at 2048x1280 windowed or full screen and the sim looks and runs...