My friend says that 700w power supply above is needed? Is this true?

Well my friend (hes quite knowledgeable on computers" said that the minumin power wattage you should go in a PSU is 700w and above. His reasons are is because with the newer stuff coming out nowdays its more smarter to go higher and if you want to upgrade you can without worrying about wattage power etc. I just want to know, I'm building my first PC and my power supply is 620w but he says it needs to 700w but I dont wanna spend more money coz im on a budget is it really that needed????

Heres my build
CPU - AMD FX-6300 = $159.00
Motherboard - Asus M5A97 R2.0 ATX AM3+ Motherboard = $155.24
RAM - G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory = $125.34
GPU - Asus Radeon R9 270X 2GB Video Card = $325.00
PSU - Antec High Current Gamer 620W 80+ Bronze Certified Semi-Modular ATX Power Supply = $136.62
HDD - Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive = $83.92
SSD - Samsung 840 EVO 120GB 2.5" Solid State Disk = $148.34
Case - Fractal Design Arc XL ATX Mid Tower Case = $53.36
OS - Winodws 8.1 = $149.00

Btw I live in New Zealand so thats why prices are crazy...
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More about friend 700w power supply needed true
  1. 500W according to: http://www.realhardtechx.com/index_archivos/Page362.htm
    500W and 24A according to: http://forum-en.msi.com/faq/article/power-requirements-for-graphics-cards

    But if later you wanted to add another R9 270X youd need a 700W PSU as your friend said.
  2. It really depends. Some people buy a computer, use it, and then buy another one. Others upgrade at semi steady intervals. Others upgrade whenever they get some money, but never know when that is. What you should buy depends on what your answer is. If you just buy a new one every X years, then buying bigger then you need is pointless. If you upgrade semi steady, I could see buying larger then you need IF you think you'll be upgrading. There are plenty of good sub 700W PSUs, I'm using one myself. A 450-500W gold rated PSU can now be had for $50-$65USD. Not sure about NZ, but I'd rather have a good 450W gold PSU, then a 750W bronze unit I'm not even going to load 50%.
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