How much power do I need?

LingLing6 · Feb 10, 2014

To start off with, I am a first time builder. What I was wondering is how to tell the wattage/Amps you need from a power supply. My parts are as follows.

Case: Rosewill BLACKHAWK Gaming ATX Mid Tower Computer Case
CPU: i5-3570k Ivy Bridge
CPU Heatsink: Cooler Master N520
Mobo: ASUS P8Z77-V Pro
GPU: EVGA GTX 760 2GB
RAM: G.Skill 8GB Sniper Series
SSD: 240 GB
Hardrive: 1TB

Thanks for any help you give!

Devin Mann · Feb 10, 2014

your total would be around 320w so you would want to go with at least a 650w psu

Dark Lord of Tech · Feb 10, 2014

A GeForce GTX 760 needs at least 30 amps on the 12v rail and a 500w power supply.

With 44 amps on the 12 volt rail this is more than enough for your specs.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($49.99 @ NCIX US)
Total: $49.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-02-10 15:38 EST-0500)

jnkweaver · Feb 10, 2014

Im not sure where 650W came from. According to EVGA you need 500W for this system and a minimum of 30A on the 12V rail. http://www.evga.com/Products/Product.aspx?pn=02G-P4-3765-KR

You will also need an 8-pin and 6-pin connector. The XFX 550W that SR-71 suggested is an excellent psu and would have been the one I recommended also.

ko888 · Feb 10, 2014

For a system using a single NVIDIA Reference Design GeForce GTX 760 graphics card NVIDIA specifies a minimum of a 500 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 30 Amps or greater and that has at least two 6-pin PCI Express supplementary power connectors. Some of the non-Reference Design GeForce GTX 760 cards have a single 8-pin (e.g. ASUS GTX 760 DirectCU II OC) or two 8-pin (e.g. MSI GTX 760 HAWK) or one 6-pin and one 8-pin (e.g. Gigabyte GTX 760 WindForce OC, EVGA GTX 760 SC w/ACX Cooler, MSI GTX 760 TwinFrozr Gaming) PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) is the most critical factor.

Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

LingLing6 · Feb 10, 2014

Thank you all for your help. I now understand how to pick out a power supply. Thanks for helping out a noob!

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How much power do I need?

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