Yeah so with 100TH/s which we haven't even reached yet the datacentre will currently mine around 5.5 BTC a day ($2,300) and 3 months from now that will have dropped to 2 BTC a day ($900).
So in 3 months time the data centre will have mined a total of around 105k USD.
So lets work out the costs to run the data centre for 3 months:
150 boards costing approx $500 each = $75k
data centre rental 10k
electric, 25k
staff, 5k
electricians, 5k
AC parts 5k
So it must cost approx 125k to open and run the data centre for the first 3months. This means the data centre wont break even during the first 90 days. And infact if we run the mine until the power used costs more than the mined BTC (around 150days) the
total mined coin will only value 120k - and total costs at that point will be 175k. So this datacentre will not break even with BTC at $450 and in 150 days it will be making a loss due to power costs and will need to be powered down. At that point we will be 55k short on our outlay.
If you don't believe do the calculations yourself here:
http://www.vnbitcoin.org/bitcoincalculator.phpI put total data centre costs (all of above) into the miner cost field, then used - 100,000 GH, 170k watts power, 0.1 for electric, 15% difficulty increase.
So in summary the data centre will make us nothing and will leave us with a 55k shortfall by the time we need to close it down. How are the miner sales comming along?