NVIDIA Quadro FX 5600 not working great

[malingo]

I have a 3ghz mac pro intel 10.5 with NVIDIA Quadro FX 5600 and 9gb of ram also 21" cine screen with up to 1680 1080 res but when i up the graphics on the gain it starts doubling the imagesand the colour seperates i want to buy the full game but i also want full graphics does this happen to anyone else.this is fixed when i lower the res to 800 600 which i doesn't fill the widescreen display but the game was looking excellent no problems anywhere else.I found black lines down side of sceen very annying any fix and i am sorted. i am using the demo by the way