I stumbled upon an article on Bitcoin today, and did some calculations.

Apparently, each Bitcoin is worth

**17.5$**.

Mining for Bitcoins is done in Mhash/s, and every

**46** are worth

**1$**,

Which means that

**800 Mhash/s** (for one day) are worth

**1 Bitcoin** (or

**17.5$**).

As an example, an HD 6990 manages just around

**800 Mhash/s**, with a

**400w** peak power consumption.

Now the price of electricity ranges from

**6 cents** for a Kw/h to

**18 cents**, so let's take a median-high -

**15 cents**.

That's

**400w** x

**24** =

**9,600w** /

**1,000** =

**9.6Kw/h** x

**15 cents** =

**144 cents** =

**1.44$**.

Which equates to a Profit of

**17.5$** -

**1.5$** =

**16$** per day, or

**112$** per week, or

**450$** per month.

Now you can scale that essentially up to any number (I assume).

Say you own two rigs with 8 HD 6990s, considering that the rest of the components run at idle.

That's

**8** x

**900** (overclocked) =

**7,200 Mhash/s**, with a typical power consumption of

**2,400w**-

**3,200w** (let's say

**2,800w**).

That's

**2800w** x

**24** =

**67,200w** /

**1,000** =

**67.2Kw/h** x

**15 cents** =

**1008 cents** =

**10$**.

Now for the profit.

**7,200 Mhash/s** /

**800** =

**9 Bitcoins** =

**157.5$** -

**10$** =

**147.5$**, or

**1,032$** per week, or

**4,130$** per month, and

**50,000$** per year.

So now I'm going to wait for someone to poke a hole in my plan to make 50,000$ a year without doing any more work than simple maintenance and upkeep, minus original funds for purchasing the components.

Again, this is just something I found interesting as I love calculations