Having some trouble getting started mining bitcoins using GUIMiner and Radeon HD 5770 graphics card 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&nbsp;Mhash/s.

My GPU is HIS' Radeon HD 5770. It also says it's running at ~890&nbsp;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.
There isn't any point in mining with a CPU or GPU. You can get just a few MHash/s that are not enough to accept work from pools. If you want to mine, you have to have at least 1&nbsp;GHash/s, and you need to buy specific hardware, like ASIC miners. There are a few companies like Butterfly Labs, KnCMiner and more where you can buy machines. The most recent one is from KnCMiner that release preorders for Neptune, a 3000&nbsp;GHash/s machine for about 12,000 dollars.

You can also look at some cloud mining like cex.io. The price per GHash is much more, but you can trade GH any time.