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Help me out with Wattage please.

th3cray
  • 61 months ago

Hey guys, I recently decided to upgrade my CPU, Mobo and add a Gtx 780 for SLI. Below is a complete list of my build. Wattage is estimated as 750w. I already have a 850W supply, and really can't afford a better one right now. Is this enough to get me going with the sli? Or should I wait to upgrade my PSU as well?

  • CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor
  • CPU Cooler: NZXT Kraken X61 106.1 CFM Liquid CPU Cooler
  • Motherboard: Asus MAXIMUS VII HERO ATX LGA1150 Motherboard
  • Memory: G.Skill Sniper Series 16GB (2 x 8GB) DDR3-1866 Memory
  • Storage: Intel 520 Series Cherryville 120GB 2.5" Solid State Drive
  • Storage: Western Digital WD Blue 500GB 2.5" 5400RPM Internal Hard Drive
  • Storage: Western Digital BLACK SERIES 1TB 3.5" 7200RPM Internal Hard Drive
  • Video Card: Asus GeForce GTX 780 3GB DirectCU II Video Card (2-Way SLI)
  • Video Card: Asus GeForce GTX 780 3GB DirectCU II Video Card (2-Way SLI)
  • Power Supply: Corsair Enthusiast 850W 80+ Bronze Certified ATX Power Supply
  • Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer
  • Wireless Network Adapter: TP-Link TL-WN881ND 802.11b/g/n PCI-Express x1 Wi-Fi Adapter
  • Case Fan: Corsair Air Series SP120 Quiet Edition (2-Pack) 37.9 CFM 120mm Fans
  • Case Fan: Corsair Air Series SP120 Quiet Edition (2-Pack) 37.9 CFM 120mm Fans

Comments

  • 61 months ago
  • 3 points

I inputted all your components into a PSU calculator which states that 850W should be sufficient. It stated a recommended PSU of 701W (651W min), but that's dependent upon several factors you didn't mention:

1) Are you overclocking? If so, then add ~50W; 2) Any additional fans? Add ~10W per fan; 3) Any additional USB devices? Add ~5W per device; 4) Age of the power supply and capacitors. This affects the calculation dramatically:

Electrolytic capacitor aging. When used heavily or over an extended period of time (1+ years) a power supply will slowly lose some of its initial wattage capacity. We recommend you add 10-20% if you plan to keep your PSU for more than 1 year, or 20-30% for 24/7 usage and 1+ years.

10% aged: 767W, 20%: 832W, 30%: 897W, 40%: 962W, 50%: 1027W

This is the power supply calculator I used: http://www.extreme.outervision.com/PSUEngine

  • 61 months ago
  • 1 point

You should be fine to start, but you may want to explore a higher wattage option if you encounter any issues in the future:

http://pcpartpicker.com/part/evga-power-supply-220gs1050v1

  • 61 months ago
  • 1 point

Really appreciate you guys taking the time to reply. I do wanna overclock, not soon, but somewhere down the road for learning purposes and also not extensively. And as for fans, these will be all. So I guess, based on what sendekyo has explained, I get that 850w should be roughly sufficient for the time being. Btw, what happena if the components require more power than the PSU rating when in use? The system shuts down or is it more severe, like hardware damage?

  • 61 months ago
  • 1 point

Typically, the system should just shut down when there isn't enough power.

Bad OEM PSUs may go up in smoke (literally) due to the heavy load and could take other components with it.

  • 61 months ago
  • 2 points

850w will be just fine. Sendekyos calculations are assuming the System is at full load. Even when gaming, your system will not be entirely maxed out. You'll be set. Though the more headroom for PSU power the better.

  • 61 months ago
  • 1 point

Not optimal, but it will work.

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