No.... The unit is not a true power unit, and the name is deceptively named to hide its real wattage. Very poor ripple and voltage regulation, and better units can be bought at the same price.
http://www.hardwaresecrets.com/article/Coo...-Review/1550/11

80+ Bronze/Silver/Gold denotes the efficiency of the power supply. 80+ Standard is the lowest rating for a 80+ unit, where 80+ Platinum is the highest rating for a 80+ certified unit. Note that 80 Plus certification do not dictate the power supply's quality.

725W is massively overkill for a single GPU build. PSUs like the Seasonic S12II 620W/M12II 520W would be a much better choice. The R9 270X is badly priced as well, since you can get a GTX760 at the same price, which is an even faster card to start with.

Why would you want to get a cheaper PSU?
Do not skimp on the PSU. It's the one that powers your CPU, GPU and other components... Always try to spend extra on a proper PSU.

The Xigmatek Vector isn't a good one, and paying an extra RM70 could give you a much better, Seasonic S12II/M12II unit, despite it's value and 80+ Silver certification.

Are you sure it's the Delta-built Antec VP550P ?

Can you find the UL number on the packaging? It should look like this:

No... to find out the OEM of the PSU...