Thanks for joining the graphics community.
I understand you are trying to get 2560*1440 screen resolution.
Please bear in mind that your graphics controller can handle up to 2560 x 1600. This is possible if the graphics video BIOS is not locked by your computer manufacturer.
Try the following steps:
You need to make sure that you install the latest monitor firmware or monitor drivers.
Update computer BIOS, this will interact with graphics video BIOS:
Download the latest video drivers for your graphics controller here:
It still says that I am "exceeding maximum bandwidth capacity"
GUYS, I have succeeded, I had to get an old driver and use CTV-RB, and had to use 50Hz, but I have my old 2560x1440 back, and it is oh so glorious. So ends a nearly 3 day saga of pain.
Thanks for testing and posting your results.