thank you for your input. how about solar panels (I live in Florida)
why you say "1200 in the first month" -- does it have to go down after first month??
No you cannot make a living off it unless you have a cheaper than usual energy source.
With those 5K you can buy 8x 6990.(2GPUs each) for a total mining power of 5.6 GHahes/sec
At that rate you would be generating on average each 19 hours, 46 minutes and this rate would last for 2 weeks approximately. It means you would be guaranteed about 850 BTC and at current difficulty jumps, this being a wild guess, you would be able to get top 1200 in the first month.
As far as the BTC <-> USD goes, it may go up or down. Nobody can guarantee you an outcome. The most favourable outcome for you would be it to continue rising to the 1 BTC = 5 USD if you plan to ever get your investment back. Please note I didn't include the electricity costs, the system would consume about ~3K watts or even ~4K watts and cooling will be a bitch.
You may hoard them if you wish and wait for them to be profitable to sell, which isn't a guarantee. The alternative is just to buy goods and services with them after mining.
/Note: The average time is of constant work. If it is shut down it doesn't count and it is of the 8x 6990 working together, not each individual one.
