*Working* Custom Eyefinity Resolutions [Tutorial Inside]

The Problem: So, I've been trying to figure this out for years it seems. I've been running a single GPU setup with 3x30" monitors since the 5000 series came out and running 7680x1600 is sometimes to hard to push a single GPU. So I wanted to run a lower resolution. Unfortunately that resolution was 5040x1050 in which is too small to look good on a 30". So I wanted to run 5760x1200, but it wouldn't show up in the Custom Eyefinity Resolution section.

Imperfect fixes:

• Buying a New 30":
  I tried getting a 30" with a scaler to run 1920x1200 over and group it with the other 30"rs. This worked by giving me 5760x1200, but it kept me from easily going back and forth from 7680x1600 and 5760x1200.
  Also since I was using mis-matching inputs, I got tearing on the Single-Link DVI monitor.
  On top of which the Dell 3008wfp has horrible input lag.
  
  SoftTH:
  Breaking Eyefinity into extended monitors and running SoftTH was okay. It gave me 5760x1200, but I had to change each desktops resolution each time I wanted to game at that res. I was also stuck with only DX9 and some games had compatibility issues.

Failed Attempts:

• I tried:
  ...editing the registry where you can add custom single monitor resolutions with 1920x1200 and trying to create a group. Nothing.
  ...editing the registry where Eyefinity resolutions appear to be store. No Dice.
  ...editing the registry where you can add custom single monitor resolutions with 5760x1200 and trying to create a group. Nope.
  ...using custom resolution utilities on their own. Zilch.
  ...a bunch of other stuff except editing the EDID directly due to my monitors not having scalers.

What works:

So after screwing around today with ToastyX's Custom Resolution Utility, I found something that worked. (I was was trying to see if I could run a 30" off a single-link DVI by overclocking the TDMS in my graphic card. It doesn't work at all unless you have a scaler and run it at 30Hz).

• I disabled my Eyefinity Group.
  Then I deleted all the entries of monitors using the tool.
  Then I restarted so that all my current monitors would come back in the list.
  Next under each monitor, I Added 1920x1200 @60Hz to the list.
  
  
  
  --Use the "Best for LCD" under Timing.
  
  
  
  Then I hit okay and then rebooted.
  Next in CCC, I went to LCD Properties and turned on GPU scaling for all 3 monitors.
  Then I created the Eyefinity Group.
  Afterwards, I went to Customize Eyefinity Desktop Resolutions and low and behold, 5760x1200 showed up.
  
  
  
  I chose it and now I can use the resolution in game as well.

It's a lot to do to get the resolution available, but this headache is now behind me. I thought I was going to need to replace all my monitors with U3011's. Now I'm satisfied. Hope this Helps.

Update: Using this method, I got 7680x1080 to work, although, in eyefinity mode, it scales all the resolutions to the whole panel. So it looks stretched. Changing this in the LCD properties menu does nothing. But I'm sure I can get some nice screenshots.

EDIT: It's not the best game because of the HUD, but you get the idea. Here's some UT3. It not as obtrusive when using not so wide resolutions.

This also works if you're trying to overclock your monitors refresh rate and run eyefinity. I was able to setup 5040x1050@75Hz on 3x2209WA's. Both on VGA and DVI.