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the RX480 ASUS strix 150 Watts?

No it's the most economical one in terms of wattage consumption.
I think it's 100 or 120

the ROG STRIX-RX480-O8G-GAMING looks not bad-) i can take 4cards how many hash rate i will have +-??

i want start for a max 600watts its beter take more cards like card GTX1050ti 4gb 54watts
or take beter cards

Well my experience is only on a AMD cards only I did not try the Nvidia cards yet.
You need to read carefully every information before you buy your cards. I recommend the RX 470 4 gigabyte they are cheap and so efficient but you need to get the saphre RX470 4gb