how fast does a Sapphire R9 280X Varpor-X Tri-X can and how can i calculate the bitcoin i can have pers day? as above i'm wondering that how fast (mh/s) can a R9 280X can and how can i calculate the bitcoin i can have per days because i'm newb to this mining
Hashrate for the Saphire can be found here:

https://litecoin.info/Mining_hardware_comparison

Don't bother GPU mining, especially for SHA-256 (bitcoin). You can blow one of those out of the water with a $20 used USB ASIC on ebay. The days of casual mining are over, you will be operating at a loss unless you have some of the cheapest electricity in the world and a large mining setup.