I am a total Noob at Mining bitcoins , well at anything Bitcoin.
my problem is that I have a server with 2 cpus and at this time it only has a single gpu, when ever I run the GPU I get an average of 178/Mhash/s ( not sure if thaT is any good) but when I run both GPU and CPU miners my GPU drops way down to between 1-5/Mhash/s why is that am I doing something wrong?

I have a 2p server with Opteron 6128s in it, when I try to mine with both CPU and my HD 7770 GPU the GPU drops from 180Mhash/s to 1.5Mjhash\s and can I fix this so That I can Mine with both at the same time?

there are so many posts that I cannot seem to find anything that tells you where the GPU mining flags are and what they do. I want to turn down my GPU % at night while I am asleep then back up again during the day but I have know clue I am Using the GUIMiner