I have real rigs and I average around 1 to 1.2 GH/s with those but get this:

32MH/s from my laptop with poclbm's f40 flag so it doesn't affect performance AND averages 15-25 watts during usage. Its running a HD6470M which I believe is a severely neutered 5850 (maybe 5830?). I am not advocated going out and buying $1000+ laptops for mining, just wanted to share my experience.