Specifications:

Here’s The Conclusion of:
 

Hothardware-

Performance Summary: Summarizing the performance of NVIDIA’s new GeForce GTX 280 and GeForce GTX 260 cards is quite easy.  The GeForce GTX 260’s overall performance falls somewhere in between the single-GPU based GeForce 9800 GTX and dual-GPU powered GeForce 9800 GX2, and it is usually faster than the dual-GPU powered Radeon HD [...]