Quote:
Originally Posted by gebu
Sorry, I have to ask... what exactly is a mining rig? 
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Bitcoin (or in this case Shitcoin)
You use GPUs to solve a complex puzzle, if you're the lucky one to do this first then you win a block of virtual currency. This can be exchanged for other virtual currency, or cold hard cash.
With the 8 x 290s shown in the OP edgeprod could make (very roughly) about $70 worth of coins per day.