I wanted to give mining bitcoins a go. I set up a wallet and downloaded GUIMiner. I also signed up for Slush's pool and all of that fun stuff.
However, my GPU seems to not accept anything. I have zero accepted and two stale/invalid.
My CPU is running GUI and has accepted shares. It's running at ~3.6 Mhash/s.
My GPU is HIS' Radeon HD 5770. It also says it's running at ~890 Khash/s which seems low. It's stably overclocked and has been for some time now. How do I properly set up this GPU on GUIMiner?
My current preferences are set to
-v -w128 - that I saw that on the hardware settings Wikipedia page.