Quote Originally Posted by Mechromancer View Post
Heres the GPU2 FAQ: http://folding.stanford.edu/English/FAQ-ATI2

Unfortunately you can only run 1 GPU2 client on the 3870X2 at the moment. Crossfire has to be DISABLED to run two clients on a multi-GPU system also. At the moment, two HD3870's is looking like an economical option. Until the 3870X2 is fully supported in a future release, having 2+ separate cards is the way to go.
What about multi-gpu support and the -gpu flag?

Multi-gpu is supported through the -gpu flag provided on the command line. Similar to running multiple SysTray CPU clients, copy your \Application Data/Folding@home-gpu to Folding@home-gpu2/, and copy the shortcut and edit it to point to that new working directory. If you run the client from the command line, the current directory will be used for data and thus the .dll files must be there as well (see DLL issues below). The display must be active on the board you plan to use, and –gpu 0 will select the first board, –gpu 1 will select the second board, -gpu 2 the third board, and so-on. You will need to disable crossfire for multiple boards to be detected. Currently, only one client is supported on a 3870X2.
Now they only need to use 55% of the market share instead of the miserable 20%.
I see a quadcore running SMP + doule GPU2. SMP on idle and gpu's on low ^^