i7-690 can draw ~100W to ~130W at +12V. GTX 780 can draw ~250W to ~300W at +12V. Other components in your system (Motherboard, RAM, HDDs, SSDs, and Fans) can range around ~70W to ~100W at +12V. So, estimated total draw at +12V rail can be around ~420W (~35A) to ~530W (~44A).
The Superb720, which provides only 504W (~42A) at +12V, would be close to the rated limit and will be considered inefficient and risky for that system of yours. The Corsair VS650, providing 600W (50A) at +12V, will be better in terms of ample wattage and efficiency compared to the Superb720. However, again, both PSU's are not good-quality models. So, though it may power your rig now, you don't know how long will it last or will it be reliable and...