Hi Miners,

There has been some discussion about the current costs associated with mining for bitcoins. Obviously it is dependent on a few variables but if we could come up with a ballpark figure, or a range, for the UScents per GHash/second at the current difficulty.

Take the most efficient card now available, AMD HD 5970, run it at most efficient clocking/power consumption, calculate the (GHash/s)/kiloWatt,

https://en.bitcoin.it/wiki/Mining_Hardware_ComparisonI suggest measure it directly for your total rig, i.e. include mobo, monitor if you use one, etc.

Multiply by your local kiloW.hr electricity rate and divide by Bitcoins per GHash/sec at current difficulty,

http://www.alloscomp.com/bitcoin/calculator.phpEstimate current UScents/ bitcoin. Add on top of that card amortisation (say 1 card last for 12 months on average). Call this gross expenditure.

Add on top 30% for sys admin and sundry overheads (more if you think necessary). Get final UScents per bitcoin, (or whatever your local currency units if you prefer.)

I'll do a spreadsheet if anybody wants it.