Ok, got my parts in and my initial 2 GIGABYTE GV-N75TOC-2GI GTX 750 Ti's in, and have everything up and running. So far I am only managing to get ~280 kHash out of each one. Running Windows 7 64 with latest Nvidia drivers and latest cudaminer.

My launch config is -m0 -l T5x24 -I 0 -C 1 -H 1

Tried different values for m, C and H and no difference. I am also running a slight +50 core and +300 memory overclock. I was hoping to see the 320 kHash everyone else seems to be getting but running out of ideas. Any insight or ideas of things to try would be appreciated.