yasir siddiqui said:
you must change your psu as soon as possible at least 500w otherwise it can b burn with 300w psu because ATI cards need more power as compare to NVIDIA.
You got it backwards. Actually AMD cards use LESS power than comparable Nvidia cards.
You don't want a 6570 2GB. You'll never use the other 1GB and it's probably more expensive and slower memory. The 1GB version likely has faster memory than the 2GB version. It's a trick to make people think it's better but actually it could perform worse.