I was going to try this to see how much of a jump I would get but I am not a dos person so when it came to running the nvflash I had to stop. Just don't know the commands.
LOVE IT!! Getting 337kh stable. 341kh gave me BSOD.
What configuration are you using for that? I have an MSI as well and currently getting about 285KH/s per card.
-d 1 -i 0 -l T5x24 -C 1 -m 1 -H 1
Modded the bios following the instructions from a few pages ago. Had to pull the BIOS off the card in DOS, back into windows to mod, back out to DOS to flash, back into windows to run.
If you are running more than one card on the same system you have to flash one at at time using the "--index=#" flag where # is your device ID (0,1,2 just like cudaminer).