Drop in resolution, corrupt graphics

Hi all,

I recently completed building my new PC, and so far so good.
The only problem I've encountered so far is regarding the screen
resolution.

My TFT's native resolution is 1280x1024 and that's how I keep it. It
looks great although some text is slightly on the small side.

Just to test out, I tried dropping the resolution to 1024x768. The
output is terrible. The text looks corrupted and unreadable. I
understand that changing resolutions to one that isn't native will cause
loss in quality but this is more than just blurring.

I've tested the monitor on another PC and tried 1024x768 and it looked
ok. So I'm guessing its a video card/driver problem. Has anyone
experienced this or know of a fix?

I tried a 'print screen' but the output looks normal and uncorrupted
when I revert back to native settings.

At the moment I'm able to run games at 1280x1024 , but it looks likely
that if I ever need to drop resolutions, It'll look terrible.


Monitor - iiyama E431S
Video Card - Sapphire 9800Pro