thank you for your answers
as i said im new to bitcoin, recently i was planning to buy a new pc for gaming and now im wondering if i can cut my budget for buying ps3 or iphone5 or changing my car and add it to my pc for exampl buying an a10 amd apu + 3 X 7990 vga and ... how long woud it take to earn back the money spend for this pc , dose it worth or no?
It depends a lot of the cryptocurrency price fluctuations and electricity prices. There's a chance you won't be able to earn back your investment at all.