Black borders around desktop on sidescreens - need help (again)

[Ghostwire]

New installed Windows 7 System. Eyefinity works, but only center screen is using the full screen size. The other two monitors left and right have black borders around the desktop (not whole screen size is used)
Overscan option in CCC is greyed out.
Checking the option "Enable GPU scaling" + "Scale image to full panel size" does also not work.

Setup is:
Windows 7 32Bit
HD5770 Flex
3x AOC2434PW (connected via DVI/DVI/HDMI) - actual driver installed
CCC Version 2011.1025.2231.39573

Any Ideas?

[rebelstar]

I have the same borders on my third monitor connected via dp-vga but only in a non-native resolution like 4800x900, but it's fine while 5760x1080. Can you make a photo of these borders? I want to compare with mine. This bugging me a lot, not sure what to do also

[Ghostwire]

I have the same borders on my third monitor connected via dp-vga but only in a non-native resolution like 4800x900, but it's fine while 5760x1080. Can you make a photo of these borders? I want to compare with mine. This bugging me a lot, not sure what to do also

I also had these borders on another system with the same GPU+Monitors. Back then I had another version of the CCC where the overscan option was not greyed out. I could drag the overscan slider to maximum and the borders vanished. Strange thing.....

(Photo is coming. Not at home right now.)

[Ghostwire]

Solved the problem. I had to disable the eyefinity-group. Then CCC let me active overscan. Now all screen are used full-size.

Here's the image I promied for Rebel: