I doubt any of the GTX500 series will be on par with the next gen (2013) consoles once they come out.
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Maybe the GTX580 will be.
- Sure, they'll all probably also be using sub 2 billion transistor GPU's, just remember that the GTX560 and GTX400 series were not all that different.
- Even though the GTX560 does have ~ 1.95 billion transistors it's not as efficient as the more recent tech.
- Honestly between the ~ GTX260 and GTX560 there were not a huge number of performance breakthrough features. As in significantly increased performance per transistor.
- The consoles will integrate either of, or perhaps both, eDRAM and/or XDR-RAM alongside the GPU so it's performance will be 'better' than some of the initial 'on paper' specifications indicate. (Later on more up-to-date specifications of the hardware within the consoles will be made available --- this is pretty much the norm).
The GTX600 series brings far more enhancements to the table, as does/did the Radeon HD7000 series.
PS: The Core i5 desktop processor is a quad-core processor.
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http://ark.intel.com/products/65511
- You have very little to be concerned about regarding your CPU, except perhaps that you are under-clocking it by 100 MHz