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These ASICs are way too old to be useful today. Just buy some Bitcoins, it's a much better investment!
but i want to make profithow am i making profit by buying bitcoins ?
The Antminer U2 has a hash rate of 2 GH/s. At the current difficulty, it will generate about .00002 BTC (about $0.005) per day. If you bought it for $30, it will be 16 years before it pays for itself.
The miner uses 3 W. Assuming your electricity costs $0.10/kWH, it will cost $0.007 per day in electricity. It doesn't generate enough bitcoins to pay for the electricity.
but not to expesive
