I don't think you can connect it via USB directly to a PS3...you'd first have to connect to to a desktop/laptop and share the connection. (atleast not without soem driver hacking)
Or WifiRouter which does WIFI...as for speed..you can run a speed test in general to see if it "measures up" to the speed required to play the games. But you will probably experience lag here and there regardless :/
http://www.speedtest.net
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