Re: newbie set-up hardware for mining crypto-coins only please help!!
5.i know that difficult can change 
)
i know that guarantees can change don't worry)
) i know that guarantees can change don't worry
)The 1 BTC / month you have estimated was based on a spot diff ~ 2.3
Look at the spot difficulty chart the last 3 days:
http://www.coinwarz.com/difficulty-charts/spots-difficulty-chart
Try recalculate your budget
so ok if i correctly understand if difficulty have 2.3 i can earn this 1BTC right??
Yes if you are mining spots with 500 KH/s and:
Electricity cost are $0.
Difficulty stay at 2.3
Your gear works 24/7
Your pool has 0% fee
Your pool has zero pool downtime.
The exchange rate for spots down go down.
ect.
electricity cost are $0??XD not in this world ;DD ok thanks
) and last question if you have 2 GPU to choise R9 280x and Radeon 7950HD what is your choise??