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I want to buy a new Power supply for my i7 core processor, gtx 770 video card with ASUS SABERTOOTH Z77 motherboard. I am looking currently to go with either Corsair 550W power supply or Antec HCG 620w psu? I want to actually go with the Antec brand only because I have heard Antec PSU's long last but wanted some confirmation before stepping forward. Thanks
I would say that a 620W power supply would be plenty for powering a single graphics card, even if you are doing some overclocking of CPU and GPU together. But if you want to add another video card in the future in SLI then you will need to get a minimum of 750W power supply. Antec, Corsair, Seasonic, etc; are all good brands for providing quality PSU.
For a GTX 770 graphics card the minimum system requirements is a 575Watt Power Supply. If you try to perform some overclocking of your GPU then you can add a little bit of 620W to 650W power supply requirement, specially if the +12V is not a single rail design. Note that the power supply is the only component powering everything and it is very important.
Antec High Current Game 620W Power Supply comes with its maximum combined +12 Volt continuous current rating of 48 Amps. It also has a 6+2 pin PCI-E power connectors for the graphics card. So, it is more than sufficient to power a single GTX 700 graphics card along with the other components in your system as well.