Hello "Spirals",
Please AVOID using that PSU model....That's a cheap generic branded PSU/ 1STPLAYER , not recommended for Gaming rigs.. This unit won't even provide that much wattage output as labelled.
Don't SKIMP on the PSU. I can't stress this enough. Grab yourself a HIGH quality PSU from reputed brands like EVGA, SEASONIC, ANTEC, CORSAIR, just to name a few....
Also, make a note of this.
The total wattage number of any PSU is not always really the most important deciding factor, primary concern is the 'quality' of power it produces, and the total capacity of the 12V source etc.
A cheap generic/standard low-end PSU is prone to failure soon, than the units made by reputed brands like SEASONIC, Corsair, BE QUIET, EVGA Supernova, PC Power & Cooling, ANTEC (except earthwatts series), XFX, Super Flower, OCZ, just to name a few.
The OEM also matters a lot, instead of the actual PSU brand. I've seen PSUs labelled as 1K watts, but in actual real world scenarios, they can hardly pull 400 Watts from the wall, even under full load.
I've always given the topmost priority to PSU when building any RIG, and I mostly go for Tier 1 and/or Tier 2 units, because we know a TITANIUM/Platinum/Gold PSU is going to be much more efficient under 50% load, than a bronze/silver or a generic 80 plus certified PSU. But the exact Wattage requirement still varies from system to system, and if we plan to Overclock the GPU/CPU, then the PSU should have some headroom as well.