[04:12:10] <@PooL-X> The expected generation output, at 200 KHps, given current difficulty of 1.5926655, is 126.31 LTC per day, 5.26 LTC per hour, Estimated time to find a block is 9 hours 30 minutes 3 seconds
That's the amount of kh/s mtrlt was saying, or at least an average: that's $1.20 a day.
Now, with my 6870 I get 300mh/s on bitcoin...which earns me an avg of 0.2BTC a day, which is around $1/day
So really they're about equal, if bitcoin price rises any more, it's more worthwhile to mine bitcoins on a GPU.
I believe that quoted 200 KH/s is from a single 6990. So 126.31 LTC per day from a 6990 equals roughly 0.2808 BTC per day. You could just as well mine BTC to the tune of around .60XX BTC per day with the same card. Unless I mis-read where that 200 KH/s came from, you'd really have to squeeze 400 KH/s+ out of a single 6990 before it even begins to become equal to net daily output from mining BTC.