the only thing to really do is overclock your cards
and maybe to run two instances in parallel, bringing your GPU utilization closer to 100%
Have overclocked as high as they will go and still be stable but have some weird PCI issues. One only goes to 215kh/s, and the other is rock solid at 300kh/s on Scrypt. Both run happily at 300kh/s on their own in the 16x slot, but when I hook up the riser, the card in the 16x drops to 215kh/s max.
How do I run two instances? Just two separate .bat files and drop the -t 2 command from each or is something else needed?