what is the best graphic card for my PC?
motherboard : BIOSTAR PURO HI-FI A85W
processor : AMD A8 APU 5600K Quad core 3.60 Ghz
RAM : 8 GB
OS : windows 7 ultimate 64-bit
VGA : ATI RADEON HD 5570
HDD : 1 TB
If i wan't to change my graphic card for best gaming result what is the best VGA card should i buy?