What a lot of people do not consider is whether you're running a sh##tload of other stuff on your rig or not.
For example, if you're running a screen recording software while paying games, you will have significant performance drop. The next gen consoles are specialized APU's that have a lot of really nifty architecture enhancements that allow parrallel processing of particle physics, etc, and thus their CPU cores and RAM and L2 caches and FSB's etc will be just a whole lot more effective when rendering in-game graphics.
In other words, you can't really directly compare the various specs (RAM, GhZ, Cores) of a vanilla PC (standard CPU with dedicated PCIe GPU configuration) with that of a console with it's custom APU that is optimized for gaming engines.
By 2014 you will eventually discover that 2GB RAM for your GPU is a standard requirement. Game worlds are getting larger and overall polygon counts are getting bigger. LOD's are getting wider... that requires more RAM on the GPU, but 8GB on the MoBo will be fine for a while still.