Can Someone Tell me the difference between these to video cards

[TorturedChaos]

These are the two cards I was comparing

Other than the fact that one with the $50 rebate is out of stock, and once says
Memory Clock-1600MHz (effective) and the other 1600MHz. Does that make a big difference??

 

[Rage_3K_Moiz]

The one with the bigger rebate also has a dual-slot cooler, meaning it'll throw the hot air out of the case but occupy one PCI slot. The other is single-slot, and is otherwise identical to the dual-slot one.

 

[TorturedChaos]

Cool Thanks!