Luckily you can always buy more powerful hardware for PCs, where as console gamers will be stuck with the same hardware for the next 6+ years. And there is always Mantle and SteamOS promising to reduce the overhead that limits PC performance, tho it remains to be seen how well that works in practice. But sure consoles will always get you great performance relative to the cost if you are happy to settle for whatever spec they target.
Also on PC you can usually make your own tradeoffs of IQ and performance for the best experiance for yourself. For instance if 60FPS is important to you you can achive that with almost all games by lowering other things that are less important to you personally even if you have a system that overall performs worse. Many effects that developers tend to like often look bad or give a poor ROI in terms of performance anyway. So you can still often get a "better" experiance on PC, which why comprehensive settings are important to PC gamers.
Also funny to note if the rumors of the next gen consoles reserving ~3.5GB of their RAM for the OS they will actually have more overhead than windows lol. Hell Windows 8 plus a web browser with 4 tabs open and Steam running only uses 2GB...
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