Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.
Using a VGA cable is most likely your problem....yes the cable is a VGA one and I use the DVI-VGA adapter.
Also have a look here in the nvidia control panel...and check which scaling option is ticked..Its possible its not actually using native res even tho it says it is - does the OSD menu on the panel show the resolution the display is running at?