PSU Wattage Suggestions Needed for New Build

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jocumo

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Aug 31, 2013
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I'm putting together a list of parts for my second PC build and was wondering what wattage I should be considering for a PSU. I'll list my components below. Thanks in advance for any suggestions, they are greatly appreciated.

GPU: 2x GIGABYTE GV-N770OC-2GD GeForce GTX 770 2GB 256-bit GDDR5 (SLI)
CPU: Intel Core i7-3770 Ivy Bridge 3.4GHz (3.9GHz Turbo) LGA 1155 77W Quad-Core
MOBO: ASUS SABERTOOTH Z77 LGA 1155 Intel Z77
Memory: CORSAIR Vengeance 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 1600 Desktop Memory Model
 
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ko888
For a system using two GeForce GTX 770 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 850 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 62 Amps or greater and that has at least two 6-pin and two 8-pin PCI Express supplementary power connectors.

From actual measured GIGABYTE GV-N770OC-2GD graphics card only maximum power consumption figures a PSU with minimum of 750 Watts with a maximum combined +12 Volt continuous current rating of 55 Amps or greater and that has at least two 6-pin and two 8-pin PCI Express supplementary power connectors would work. If any overclocking of the CPU or GPUs is...
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oczdude8

Distinguished
Oct 18, 2009
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Minimum: 850W
Anything less then this and you might run into problems. Since wattage is not the only important thing. 2 770s need a lot of amps on the 12v rail and the 850W is the only one with enough.

Recommended: 1000W
Its always good to have headroom in your psu. Also psus are designed to run the most efficient when they are under 50%-60% load. Having less strain on a psu also means increases lifespan and decreased noise.
 
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ko888

ko888

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Feb 18, 2009
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For a system using two GeForce GTX 770 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 850 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 62 Amps or greater and that has at least two 6-pin and two 8-pin PCI Express supplementary power connectors.

From actual measured GIGABYTE GV-N770OC-2GD graphics card only maximum power consumption figures a PSU with minimum of 750 Watts with a maximum combined +12 Volt continuous current rating of 55 Amps or greater and that has at least two 6-pin and two 8-pin PCI Express supplementary power connectors would work. If any overclocking of the CPU or GPUs is planned then go with the 850 Watt PSU requirements mentioned by NVIDIA.
 
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