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Using my existing hardware, I want to work out which altcoin is still profitable to mine.

I have found this link:

But don't know which values to enter into the boxes at the bottom of that page.

- How do I work out the SHA-256 and scrypt hashrate
- For the Power(W) box, do I enter in my computers PSU wattage? I think it's 650w
- For the Power Cost ($/kWh) box, do I check my electricity bill to find out how much I am paying per kWh?