In addition to the differing clock speeds, one of the cards you posted is the regular 560 and the other is the 560 Ti. The Ti has another SM enabled, bringing another 48 cores and the associated texture units and other hardware. It is going to be generally more powerful than the 560.
Just another thing to look into when comparing the two cards.
EDIT: Also, as far as I know upgrading your GPU would be worth it with that CPU. I was able to use much of the power of my previous PC's GTX 460, and that was with a Core 2 Duo.
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i5-2500K @ 4.5GHz | 8GB DDR3-1600 | GTX 560Ti-448 (1.25GB) @ 925MHz | TrackIR 5 | X52(Modded), Saitek Pedals | Win7-64
Last edited by BMCha; 01-01-2012 at 07:46 PM.
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