Pardon me if this is posted elsewhere, I tried to search before posting but could not find any info on this.

I am new to Bitcoin and I love what it can and could do for people. I decided to setup a couple of the computers around that house that are on all day as miners just to see how it worked.

I followed a couple guides out there that seemed to get me up and running but I have a couple questions. I'm running a computer that has a Radeon 6950 in it and I'm seeing 2 different numbers when it comes to hash/s.

I'm using the GUIminer to solo mine and it's connected to the Bitcoin client. GUIminer says its averaging somewhere around 275 Mhash/s. Now, looking at the actual Bitcoin client on the bottom left i see around 5500 khash/s.

Which is the speed that I'm actually contributing?

According to other people's posts, running somewhere aroung 250-300 Mhash/s I should begin to see my balance go up throughout the day. I have run the software for probably about 7-8 hours and I'm at 0.00.

I don't have any crazy expectations of getting rich quick or anything like that, I just want to make sure that I've got things setup right to contribute

My total household contribution if I'm correct, is somewhere around 325 Mhash/s but I don't know what "difficulty" means to use one of the calculators out there.

Any help would be appreciated!