525 watts PSU is not enough for the video card or much of anything else. Your system is straining for power...!! You need at least 720 watts PSU
525W from a reasonably good PSU is enough for ANY mid-range PC.
A Pentium-G and HD7770 will use around 150W.
An overclocked i7-3960X with overclocked HD7970 use only ~350W.
A REAL 500W PSU is enough to power a lot more hardware than what most people think it can and Seasonic PSUs are usually among the best there is.
So a 525W Seasonic PSU should definitely be overkill for the OP's system.