I am not the end all on knowledge for this topic, I am going to paraphrase things into a method I understand, and I offer no financial advise for this. I am involved only as I have interest in economical things.
So, I'll try to give links to what I have learned and since it's my thread I'll throw around my $0.02 as well.
Long and short is this, Bitcoins are a form of currency that is created with hardware "hacking" security type algorithyms. The reason it has value, is because people like you and me give it value. It's basically non hackable, it has a limit on the amount that will ever be available, it's decentralized.
Gizmodo
http://www.gizmodo.co.uk/2013/04/what-is-bitcoin/Wiki
http://en.wikipedia.org/wiki/BitcoinBitcoin Mining is using your hardware, CPU, and GFX cards to crunch these algorithyms.
A side note, there are a few manufacturers of some new hardware called ASIC chips that is designed to only bitcoin mine, and do it very well. However there is a lot being said negatively about these companies scamming and being a hoax.
https://bitcointalk.org/index.php?topic=114329.0Here is the site that is one of the GOTO exchanges, and will give you an up to date on the value of the bitcoin
https://mtgox.com/And here is a site that can help you in speculating the profitability of your mining rig.
http://www.bitcoinx.com/profitCpu's don't process fast enough to be worth it, and Nvidia Gfx cards are generally under powered, as the more Shader Processors (SP) you have the more you can crunch. Nvidia uses other math and tech to do the same job as SP. ATI is the place to look for high SP count.
Here is a site that shows the crunching ability of a large amount of ATI cards, as well as rough estimates on cost and electricity used.
https://en.bitcoin.it/wiki/Mining_hardware_comparisonI know this little write up doesn't offer a ton of answers to the questions that this idea creates, and Google and Bitcoin forums can take care of that.
My setup is a HD 6950 with the 6970 shaders unlocked, and for 200 watts i get about 400M/Hash
I'm also in negotiations for a couple of HD 5870's
which all said and done should put me at 1200-1100 M/Hash for under 600 watts.
Leave questions, and your opinions here and discuss as you feel the need to.
I keep no secrets and will share what I know.
As of this write up the Bitcoin was crashing. It was at $266 this morning and now down to $149.
I strongly recomend you not try to make this a retirement plan, but a hobby.
Cheers!
Xander
P.S. The spelling and grammar police can piss off.
