is it really only 4btc per day ? - it should be 14BTC with 65000mh/s so its only 2 months to pay back for itself
edit: nvm
it was x3 ;p
It should be close to
BTC5 per day at current difficulty. When overclocked, it should be closer to
BTC5.26.
Assuming that the difficulty increases linearly to 5x of the current difficulty in 1 year,
BTC750 would pay back itself in about 220 to 250 days ignoring power cost.
Is that too long? The answer will depend on who you ask!