Dell ST2410 60Hz Issue

Hey guys,
I just bought a Dell ST2410 monitor and am very pleased with it.
However, I noticed that when the refresh rate is set to 60Hz, the text and graphics on screen seem to be a bit blurry and not quite as sharp as they should be.
When I turn the refresh rate down to 50Hz, the graphics and text are crystal clear, however I have lost some of the refresh rate to accommodate that.
Why is the picture not clear when set to 60Hz? (1920x1080 resolution)

Thanks!

PS: I have the latest Windows 7 Drivers installed and am running an ATI Radeon 4850.

nvm guys,
I figured it out, turns out theres a phase setting on the monitor, and playing with that fixed the problem