which PSU for my build 750 or 850?

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psyxz

Honorable
Jan 11, 2014
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Hi, first time builder here, was wondering which PSU would be better for my current build. The CORSAIR HX Series HX850 850W or the CORSAIR HX Series HX750 750W, which is the same psu but 100 less watts.

Mobo:MSI Z87-G45 Gaming
cpu: Intel Core i7-4770K Haswell
hard drive: WD BLACK SERIES WD2003FZEX 2TB 7200 RPM
optical drive: LG Black 12X BD-ROM 16X DVD-ROM SATA Internal Blu-ray Drive
gpu: EVGA 04G-P4-2768-KR GeForce GTX 760 4GB 256-Bit
ram: G.SKILL Ripjaws X Series 16GB (2 x 8GB)

I checked a couple psu calculators but I got mixed results. any advice would be appreciated
 
Solution
ko888
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.

For a system using two GeForce GTX 760 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 700 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 50 Amps or greater and that has at least four 6-pin PCI Express supplementary...
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ko888

ko888

Titan
Feb 18, 2009
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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.

For a system using two GeForce GTX 760 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 700 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 50 Amps or greater and that has at least four 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.
 
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