We are planning give an iframe from our server to the site which daily visitor 500k. What do you think about how much do we need system resource such as bandwidth and RAM.
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Unfortunatley it's not as easy as that. It all depends what's being run on the page / what webserver you're using etc. If it's only text, you really wont need much at all running ngix.
However if it's all dynamic content, it might need lots for mysql etc.
Can you go in to a bit more detail?