I hypothesize that the PS4 at RD will cost around $700-800 (AU), which is a pretty good deal. It uses 8GB GDDR5 RAM which hasn't even come out for PC's yet (only 4GB GDDR5 I think, but I don't play on PC so IDK). About the most powerful gaming graphics card, I reckon that the Radeon 7990 is the most powerful ATM (Titan isn't exactly meant for gaming).Also in response to an early comment, the PS4 will have a different interface to the XMB.