Maybe not the hardware but how the software architecture and how it uses the hardware is where it counts. An interesting test with your PC is to open up a game and note exactly how much resources it's demanding from your machine. Most games you'll notice will fit comfortably on the PS3's requirements.
A game console is free to throw a good chunk of the bloat (Windows OS not dedicated to gaming) and utilize it for the firmware. Additionally games were meant to hold the majority of the attention of the process table (there are a few background processes to make it do what it does but nowhere near the level of what Windows requires). All that freed up resources from general computing is where consoles get its "umph" to bring it up to speed with performance.
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