Ah! I see... the crappy i7 930
I use the same i7

with a 5970 and if multi-GPU is enabled (A.I for AMD, 3D-Performance for nVidea) the load
will be shared by both GPUs whether or not the game is supporting it.
Somewhere I picked up, that Alt-Tabbing out of a game
may disable SLI?
In your SLI configuration panel is "3D-Performance" ticked?
Drivers are updated of course? For MB as well?
Can't you make a profile in MSI Afterburner for SH5?
Will follow this and wishing you Good luck!