I really think to mine bitcoins much anymore you have to have multiple GPUs/video cards.
Myself, I think bitcoins have a place in commerce, but both the dollar and bitcoins have a crucial flaw: they are unbacked by any commodity and therefore worthless.
Jonesy's Son, I have looked into mining on more than 1 occasion. Now, I am under the impression that you have to upgrade equipment fairly frequently - is that the case? At what rate do you have to mine in order to cover the expense of the equipment and the cost of electricity?
That depends on your costs. I estimate using my cost per gigahash. If you keep your costs low, and want to expand the way we are, we put roughly 75% of our income back into more miners. This lets us grow our $/day, while still taking out a substantial amount of capitol per day/week/month.
I actually mine bitcoins, and have for a good while.
GPU mining for bitcoin is dead. To make any profit on bitcoin, you need ASIC miners (Application-specific integrated circuit).
I manage a 4th/s (terahash per second) mining operation, which makes roughly 1/3 of a bitcoin each day at the moment.
They will be expanding to a total of 100 th/s within the next three months.
To mine cryptocurrencies with GPU's, you need to look at Scrypt based currencies.
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