Once you get hooked on Bitcoin Mining you then will be asking yourself "DO I go further and get better equipment? ". Having tried the Bitcoin mining and found it to your liking as with anything else you start thinking what else can I use, how can I improve what I have or do I go all out and build or buy a specialized miner?
Some research is warranted here to find out what it is that is will make your experience and productivity better.
If your computer is an average built computer then most likely you have a normal CPU and one video card. If you have an AMD CPU then you can improve the PC with Video cards that are better suited at mining.. These seem to be AMD based video cards and different models are better then others.
If your really smitten by the bitcoin bug then you can actually buy a specialized bitcoin miner
.Of course you will have to weigh the cost vs. the return.
Deciding on what to do.
If your trying to not spend a lot of money and want to add to your current computer then you can look at the available video cards that will produce the most Mhash/s and Mhash/j
AMD cards are great compilers as the work well at algorithms so that means a HD 7970 would be a great card to get. However a 5970 and 6990 are also good. The 7950 comes in just under the 7970 so a few bucks can be saved there as well.
A normal PC with several cards.
If your motherboard supports multiple video cards then you could invest in several of the previously mentioned cards and run your miner with 3 or even four cards. As long as the CPU is an AMD CPU you will be ok to keep your current setup.
If you really want to specialize then you can purchase a video card designed specifically for bitcoin mining.
The card hasn't been released yet but once it is you'll have the option of getting a video card specific for bitcoin mining.
For the really advanced and completely hooked there are the special built Asic mining machines, these are special built computers that are designed and built completely for bitcoin mining and while some can be inexpensive others can be costly. You would have to decide what you want to invest in mining equipment.
The crazies. There are those that will go all out and put together by themselves outrageously built set ups that just leave you shaking your head.
So there you have it the bitcoin mining machines and how badly are you bitten?