It took me a while to figure out how to get it going on my AMD 6950, but the final implementation is very simple. It just took me a long time getting there.

Quick disclaimer: I did all of this on Windows 7 64-bit. So if you're running anything other than Win 7 64-bit, I can't guarantee success, though I suspect you'll be fine.

1. Download either the v6.41 Windows XP/2003/Vista/7 GPU3 (required for Fermi) no-nonsense console client OR v6.23 Windows XP/2003 GPU2 console client OR v6.23 Windows Vista/7 GPU2 console client. You may go to the High Performance client page directly by clicking here.


2. !!FOR v6.41 ONLY!! -- If you attempt to run the installation file you will get this error: At present your GPU is not supported or you need a current driver. As seen this this picture:
01-Win7-first-run.jpg

Instead, you must create a shortcut to the v6.41 installation file. Now right-click the shortcut and choose Properties. On the Target line, add the switch -forcegpu ati_r800. As seen in this picture:
02-v6.41-Win7-forcegpu.JPG

Go to Step 4.


3. !!FOR v6.23 ONLY!! Unzip the v6.23 Zip file into a folder. Like v6.41, if you attempt to run the client you'll get the error your GPU is not supported. Instead, you must create a shortcut to the v6.23 executable. Now right-click the shortcut and choose Properties. On the Target line, add the switch -forcegpu ati_r700. As seen in this picture:
03-v6.23-Win7-forcegpu.JPG


4. Execute the edited shortcut and go through the first-time configuration menu. Enjoy!

There is a reason why I used the switch -forcegpu ati_r800 on v6.41 and -forcegpu ati_r700 on v6.23. I spent a *long* time reading the official F@H forums and saw where the maintainer of the F@H switch wiki said ati_r800 is not understood by v6.23, but it is in v6.41. Thus, for v6.23 you need to use the older switch ati_r700.