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PSU Wattage Question in Regards to SLI GTX 780 System

My system(in the future) will have:

SLI Asus GTX 780 DCUII each with a slight overclock
i5 4670k @ ~4GHz on a Gigabyte UD4H Motherboard
1 Intel 240 GB SSD
2x4GB 1600 MHz DDR3 RAM
1 WD Black 600 GB HDD

The PSU I want is the Cooler Master V850 which is a Tier 1 PSU according to the lists and should be pretty good option.

My concern is that when I punch in some data in the Power Calculator(http://www.extreme.outervision.com) it says they reccomend a 840 W PSU. This is with a 30% capacitor degradation, Overclocked CPU (4.6 GHz, 1.3V). there are no option to overclock GPU in the calculator though I am unsure if that impacts Wattage requirements.

I do not want to sell myself short on wattage in the years to come.

So, would a 850 Tier 1 PSU get me enough juice to run my rig?
8 answers Last reply Best Answer
More about psu wattage question sli gtx 780 system
  1. Overclocking graphics cards will increase power consumption. I would go for 1000w. I'd hate to see a weak PSU wipe some really expensive parts out. Go for a Seasonic, Silverstone, or XFX(by seasonic)
  2. For a system using two GeForce GTX 780 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 65 Amps or greater and that has at least two 6-pin and two 8-pin 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.

    The Cooler Master V850 (RS-850-AFBA-G1) power supply unit, with its maximum combined +12 Volt continuous current rating of 70 Amps and with six (6+2)-pin PCI Express supplementary power connectors, is sufficient to power your system configuration with two GeForce GTX 780 graphics cards in 2-way SLI mode.
  3. ko888 said:
    For a system using two GeForce GTX 780 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 65 Amps or greater and that has at least two 6-pin and two 8-pin 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.

    The Cooler Master V850 (RS-850-AFBA-G1) power supply unit, with its maximum combined +12 Volt continuous current rating of 70 Amps and with six (6+2)-pin PCI Express supplementary power connectors, is sufficient to power your system configuration with two GeForce GTX 780 graphics cards in 2-way SLI mode.


    Copy and paste is great and all but that PSU leaves no room for an overclock , which was stated as relevent in the OP
  4. For your reference, I am running a i5-4670k at 4.2 GHz, and mild overclocks to both my GPUs as well, both of which are 780s. I am currently using a Corsair AX860, and have no problems with power, PSU, or the like. So I'd have to recommend the Corsair AX860 over the CM. If you get into heavier overclocks I would likely look to a higher wattage PSU.
  5. You mention Seasonic, Silverstone, or XFX(by seasonic) but I had Cooler Master V1000 in mind since it is on sale at Microcenter. The V-Series Cooler Master are Tier 1 accordining to http://www.eggxpert.com/forums/thread/323050.aspx

    Do you personally believe the V1000 is a good product? I read that it is actually made by Seasonic but rebranded by CM...
  6. From www.ht4u.net's review of the NVIDIA Reference Design GeForce GTX 780:

    Factory Clocks (GPU Boost Clock: 900 MHz, Memory: 1502 MHz)
    Maximum Card Power (Furmark): 252 W
    Peak Card Power (Gaming) 198.92 W

    Overclocked (GPU Boost Clock: 1150 MHz, Memory: 1650 MHz)
    Maximum Card Power (Furmark): 267 W
    Peak Card Power (Gaming): 200.20 W

    The increase in power draw during gaming for their OC was only 1.28 Watts.
  7. Best answer
    Arbiter_Arbiter said:
    You mention Seasonic, Silverstone, or XFX(by seasonic) but I had Cooler Master V1000 in mind since it is on sale at Microcenter. The V-Series Cooler Master are Tier 1 accordining to http://www.eggxpert.com/forums/thread/323050.aspx

    Do you personally believe the V1000 is a good product? I read that it is actually made by Seasonic but rebranded by CM...


    It is produced by seasonic:
    http://www.techpowerup.com/reviews/CoolerMaster/V1000/
    Looks like it has some good ratings and reviews also. I would go for it.
  8. Arbiter_Arbiter said:
    You mention Seasonic, Silverstone, or XFX(by seasonic) but I had Cooler Master V1000 in mind since it is on sale at Microcenter. The V-Series Cooler Master are Tier 1 accordining to http://www.eggxpert.com/forums/thread/323050.aspx

    Do you personally believe the V1000 is a good product? I read that it is actually made by Seasonic but rebranded by CM...


    Tear-downs show that it's based on the Seasonic Platinum Series Platinum-1000 (SS-1000XP Active PFC F3).
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