Using CGminer and i'm only getting 35 kh/s with my dual radeon amd 6670 cards.

Any tips for a higher hashrate?

How high should my intensity settings be?

Some friends of mine just set me up with CGminer for farming cryptocoins and i was just curious what sort of hash rate should i expect to get out of my cards? i have dual amd radeon 6670 and i'm running cgminer.

Also, what are some ways (besides increasing the intensity) that i can increase my hashrate?