i want to buy a graphics card for my new pc

my pc configuration is :

intel core i5-2500k
8gb ddr3 corsair ram
Asus P8H67-V
500watt cooler master power supply

now i want to buy a card between these two ...

ATI
HD 6790
256 Bits 1024MB DDR5 840MHZ

NVIDIA
GTX 550Ti
192 Bits 2048MB DDR5 900MHZ
babarali124 Reviewed by babarali124 on . Which Graphics Card ?? i want to buy a graphics card for my new pc my pc configuration is : intel core i5-2500k 8gb ddr3 corsair ram Asus P8H67-V 500watt cooler master power supply now i want to buy a card between these two ... Rating: 5