Question on Graphic cards/monitors

I just upgraded from a XFX 4850 to a Sapphire Toxic 6850. My games are seamless. Even Crysis runs stutter free at high settings. Anyway my question is I went from a DVI connection on the 4850 to a HDMI connection on the new 6850 which added about a ½” black box around my viewable screen. The image quality is better then before, and I am sure it is because of the smaller size. I have a 23” LCD that can go up to 1080. Is there away to toggle back to full screen? I have the brand new Catalyst for ATI from the ATI site, but I seem to be lost finding settings other that picture/landscape in it. Correct me if I am wrong, but I am assuming I can just hook up the DVI connection and get full screen again.

Thanks in advance

Unless you are using speakers in your monitor, there is no advantage to using HDMI over DVI.
But anyway, the black band is the result of a scaling factor setup in the Catalyst control panel, which is a real bitch to find. Lemme see (Win7)....

It varies depending upon OS and CCC version, but this is from mine:

Image Scaling for Monitors

Image scaling is performed by your monitor or GPU, and can be controlled by the Enable GPU scaling option. When the option is not selected (the default) and the current display mode is reported as supported in the monitor's EDID, image scaling is performed by the monitor. If the mode is unsupported, scaling is performed by the GPU.

If desired, you can specify a preference for GPU scaling by selecting Enable GPU scaling. Doing so ensures scaling is always performed by the GPU.

1. Based on the navigation system contained in the ATI Catalyst™ Control Center window, do one of the following:
* Navigation menu—From the display palette on the Desktops & Displays page, click the desired monitor, and then click Configure in the context menu that appears.
* Navigation tree—From the tree in the Graphics Settings tab, expand Monitor Properties.
2. Click Image Scaling.
3. Select Enable GPU scaling, and then select the desired setting:
* Maintain aspect ratio—Expands the current image to the size of the monitor while maintaining the aspect ratio of the original image.
* Scale image to full panel size—Expands the current image to the full size of the monitor for non-native resolutions.
* Use centered timings—Turns off image scaling and centers the current image for non-native resolutions. Black bars may appear around the image.

Images are scaled according to the selected option when GPU scaling is used.