How many watts should I need for new rig?

Windows 8.1 64
• 4th generation Intel(R) Core(TM) i7-4770 processor quad-core[3.4GHz,8MB Shared Cache]
• 4GB Nvidia GeForce GT640[DX11,DVI,DP,HDMI,VGA via adapter]
• 32GB DDR3-1600MHz [4 DIMM ]
• 2TB 7200 RPM SATA Hard Drive
• Blu-ray player & SuperMulti DVD burner
• 15-in-1 Multi-slot Media Card Reader, 4 USB Ports (Front/Top), Audio [Front 2USB2.0, Top 2USB3.0]
• No TV Tuner Card
• Integrated Sound, Envy Audio; Beats Audio
• HP USB keyboard and optical mouse with volume control
• Wireless-N LAN card and Bluetooth(R)(1x1)
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More about watts rig
  1. A quality 550w PSU will do you just fine, unless you plan on adding a second GPU in the future. That GPU isn't very powerful.

    PSU requirements are more amperage/quality related, not wattage relates.
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