Quick question, I own a few shares and I was wondering if power consumption plays a role in the amount of btc being paid out. While I know FPGA mining draws less power, you still have to connect to a PC. If that's the case right now I suggest you look in to purchasing a raspberry pi linux board run the cluster.
Actually, the way this contract is written, 100% of all earnings are paid to shareholders without subtracting power costs first. I reserved a number of shares for management overhead (8.3% of shares) which earn dividends like the rest. Those dividends go to pay the small electrical costs, mainly. If those dividends are more than the electrical cost, I get to keep the extra. If the electrical cost is higher, I take a loss. It's a pretty small amount either way so it works out pretty well. Other than that, I get no payment for administering the system.
I'm definitely keeping my eye on the Raspberry Pi, but what I have right now works pretty well, too. I'm using an Atom based mini-ITX board (this one
) which cost $100 and uses about as much power as one X6500. It runs bitcoin-mining-proxy, munin for monitoring, and does some other light serving for our house. This isn't owned by FPGA.contract, and wasn't factored into the power cost calculations when I set this up.
And, in order to purchase more FPGAs wouldn't you need to sell more stock?
That's correct. I'm not retaining any percentage of the earnings as cash for future expansion, so any expansion would come from releasing more shares. The talk about adding MH/s is about increasing the clock rate on the FPGAs we have already. We're using 180 MHz now and we started with 125 MHz way back in October. I've tested up to 200 MHz, but if the cooling setup isn't good enough we could burn out the FPGAs. I need to do some careful testing before I set it to 200 (and forget it).