Difference between XFX HD-577A and 577X?

[extrapoints]

I am about to pick up one of these two but I cannot tell the difference in specs:

XFX HD-577X-ZNFC
http://www.newegg.com/Product/Produc...-462-_-Product

XFX HD-577A-ZNFC
http://www.newegg.com/Product/Produc...-447-_-Product

Does anyone know if there is a difference between the two?

 

[Imp]

From the pictures, the cooler.

The egg shaped one is newed, cooler (temp-wise) and quiter. The rectangle is louder, but blows air directly out of the case, is the stock design. Go for the egg shaped one.