If you want to objectively, accurately and scientifically determine what PSU power is required for your Vid card and PC in both watts and 12v rail amps., the forum Utility link below will show you how easy it is to calculate this information and objectively determine which PSUs are quality built, reliable PSUs that can meet your needs. Be advised that the available 12v rail amps. is just as important as the total PSU wattage. You need both to be correct.
You'll be fine with the molex adaptor that comes with your card. Ask before you buy next time though, that's not a very good power supply, it's only 70% efficient. You want a power supply with at least a basic 80%+ rating and enough pci-e connectors for running the video card your going to buy.
Yes it will work, but you almost might experience some issues.
The PSU you picked does only have 1 PCIE 6 pin and the GTX 560Ti requires 2 PCIE 6 pins, so you will be using a Molex adapter which is kinda not safe