Hello there,
download MSI afterburner, and overclock it a little bit. Change Core Clock to 899 MHz and Mem clock to 1798MHz and use this configuration:


cudaminer.exe -i 0 -H 1 -C 2 -l F16x16,F16x16 -o stratum+tcp://yourminingpool.com:3334 -O user:pass  (temperature shuould be around 78ºC with fan speed at 60%)

With this configuration I am getting ~300KH/s.