I have troubles with mining at itencity over 14 - the driver/card crashes, cgminer shows 0.00/0.00 hashrate.

I'm using win 8.1, catalyst 14.1, PSU 1250w, 8gb, stock gpu, memclock and voltage.  TC is 35765. Please help.

With -I 14 I have around 660 khash/s. Please help.