if you only have 1 6-pin power connector for your psu you can use 4-pin to 6-pin molex. your power supply should be fine handling cards like 6870 or GTX560 Ti. btw the card you link above should be perfect match with your resolution
Thanks! Though, my PSU has 2 6-pin connectors, 1 is being used by the CPU and the other free.
Is the Hd 6770 any good? Do you think I can run Skyrim on high or Ultra?