It takes quite a bit of compound to do the job properly...all connecting surfaces should get a thin coating. I used AS3 on mine because I had it. And no, the plate on the back doesnt make contact with the card.
Brent,
I miss seeing "The Benchmark Slayer" in your siggy. I know why you pulled it, but I think it's time to say fuck it, and put it back.
Loved the Sapphire reviews also...
It's really nice....I almost bought the Arctic cooler, but the quality was poor, it kinda felt like a cheap toy in my hands. Plus, the Zalman was made to fit inside the shim on ATi cards, so good contact is guaranteed.