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How many watts for GTX 780 SLI?

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November 6, 2013 5:00:14 AM

How big should my power supply be for 780 sli?

Some people say 750w and others say 1000w

I got an i7-4770k too..

Atm i got a Corsair CX750w

More about : watts gtx 780 sli

a b ) Power supply
a b U Graphics card
November 6, 2013 5:03:52 AM

750watt if you don't want to overclock.

850~1000watt if you want to O.C. Simple :) 
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a b ) Power supply
a b U Graphics card
November 6, 2013 5:16:19 AM

Ninjawithagun said:
An 850 Watt power supply is the bare minimum you want to use for your setup. A 750 Watt power supply will not provide enough long term reliable power. Remember, power supplies degrade over time and in a year or so, a 750 Watt power supply will no longer provide the same amount of stable voltage as it did on day one. My recommendation is for you to buy a 1000 Watt power supply in order to gain the most headroom for overclocking as well as longevity. And DO NOT GO CHEAP when it comes to power supplies. Do your homework and research to determine which power supplies have the best reviews regardless of how much they cost. The golden rule of PC building is to never cut corners when it comes to the power supply!


I will totally disagree with you.

A decent 750watt is enough for GTX 780 SLI!.

A single GTX 780 use 250 watts under load (not over clocked).
2 way sli GTX = ~500watt

The rest of the system will require about 150~200 watt.
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January 6, 2014 1:56:18 PM

IAMEXTREME said:
Ninjawithagun said:
An 850 Watt power supply is the bare minimum you want to use for your setup. A 750 Watt power supply will not provide enough long term reliable power. Remember, power supplies degrade over time and in a year or so, a 750 Watt power supply will no longer provide the same amount of stable voltage as it did on day one. My recommendation is for you to buy a 1000 Watt power supply in order to gain the most headroom for overclocking as well as longevity. And DO NOT GO CHEAP when it comes to power supplies. Do your homework and research to determine which power supplies have the best reviews regardless of how much they cost. The golden rule of PC building is to never cut corners when it comes to the power supply!


I will totally disagree with you.

A decent 750watt is enough for GTX 780 SLI!.

A single GTX 780 use 250 watts under load (not over clocked).
2 way sli GTX = ~500watt

The rest of the system will require about 150~200 watt.

I don't think you understand how a psu works. There is no 100% efficient psu, most are about 80% efficient. Which means that your 750 watt psu will only provide +- 600 watt. I have a 600 watt psu, and run a single GTX 780. If I overclock the gpu only a little I run out of power and the systems shuts down. Please stop giving false information.
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a c 1180 ) Power supply
a c 549 U Graphics card
January 6, 2014 3:10:06 PM

For a system using a single GeForce GTX 780 graphics card NVIDIA specifies a minimum of a 600 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 42 Amps or greater and that has at least one 6-pin and one 8-pin PCI Express supplementary power connectors.

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) rated at 45°C - 50°C ambient temperature, 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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January 8, 2014 10:58:47 AM

Marley217 said:
IAMEXTREME said:
Ninjawithagun said:
An 850 Watt power supply is the bare minimum you want to use for your setup. A 750 Watt power supply will not provide enough long term reliable power. Remember, power supplies degrade over time and in a year or so, a 750 Watt power supply will no longer provide the same amount of stable voltage as it did on day one. My recommendation is for you to buy a 1000 Watt power supply in order to gain the most headroom for overclocking as well as longevity. And DO NOT GO CHEAP when it comes to power supplies. Do your homework and research to determine which power supplies have the best reviews regardless of how much they cost. The golden rule of PC building is to never cut corners when it comes to the power supply!


I will totally disagree with you.

A decent 750watt is enough for GTX 780 SLI!.

A single GTX 780 use 250 watts under load (not over clocked).
2 way sli GTX = ~500watt

The rest of the system will require about 150~200 watt.

I don't think you understand how a psu works. There is no 100% efficient psu, most are about 80% efficient. Which means that your 750 watt psu will only provide +- 600 watt. I have a 600 watt psu, and run a single GTX 780. If I overclock the gpu only a little I run out of power and the systems shuts down. Please stop giving false information.


And I am not sure you understand the way a PSU works either. The wattage indicated on the PSU is the output Wattage, not the input Wattage. So the power advertised is the one your components will actually get. For instance, if a 800W PSU is rated 80% efficiency, that means it will provide 800W to all your components but will draw 1000W from the electric socket (http://en.wikipedia.org/wiki/80_Plus#Technical_overview).
I've seen this error so many times because people always think the power advertised on products is the one that will impact their electrical bill :) .
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a c 291 ) Power supply
a c 115 U Graphics card
January 9, 2014 7:53:10 AM

Twisto Gopro said:
How big should my power supply be for 780 sli?

Some people say 750w and others say 1000w

I got an i7-4770k too..

Atm i got a Corsair CX750w


Hi - See ko888 post above. The key factor is the +12v amps available. 65 +12v amps is recommended, more for OC.
The CX750 has 62 +12v amps. It is reasonable to assume if you have a "K" processor, you intend to OC.

Considering you are short on +12v amps to begin with, you should upgrade to a good quality 850w or greater PSU.
I might also suggest considering your current components being of a high end nature that you step up in
quality from a budget/entry level PSU such as the CX series.

If you post a budget, we can assist you in finding one.

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March 3, 2014 11:22:16 AM

Europa2097 said:
Marley217 said:
IAMEXTREME said:
Ninjawithagun said:
An 850 Watt power supply is the bare minimum you want to use for your setup. A 750 Watt power supply will not provide enough long term reliable power. Remember, power supplies degrade over time and in a year or so, a 750 Watt power supply will no longer provide the same amount of stable voltage as it did on day one. My recommendation is for you to buy a 1000 Watt power supply in order to gain the most headroom for overclocking as well as longevity. And DO NOT GO CHEAP when it comes to power supplies. Do your homework and research to determine which power supplies have the best reviews regardless of how much they cost. The golden rule of PC building is to never cut corners when it comes to the power supply!


I will totally disagree with you.

A decent 750watt is enough for GTX 780 SLI!.

A single GTX 780 use 250 watts under load (not over clocked).
2 way sli GTX = ~500watt

The rest of the system will require about 150~200 watt.

I don't think you understand how a psu works. There is no 100% efficient psu, most are about 80% efficient. Which means that your 750 watt psu will only provide +- 600 watt. I have a 600 watt psu, and run a single GTX 780. If I overclock the gpu only a little I run out of power and the systems shuts down. Please stop giving false information.


And I am not sure you understand the way a PSU works either. The wattage indicated on the PSU is the output Wattage, not the input Wattage. So the power advertised is the one your components will actually get. For instance, if a 800W PSU is rated 80% efficiency, that means it will provide 800W to all your components but will draw 1000W from the electric socket (http://en.wikipedia.org/wiki/80_Plus#Technical_overview).
I've seen this error so many times because people always think the power advertised on products is the one that will impact their electrical bill :) .


Damn, I guess I was wrong. My old 600 watt psu had a max wattage output of 450 watt. I guess I misinterpreted that as low efficiency... Sorry guys
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March 12, 2014 6:27:46 AM

toyftw said:
Twisto Gopro said:
How big should my power supply be for 780 sli?

Some people say 750w and others say 1000w

I got an i7-4770k too..

Atm i got a Corsair CX750w


Hi - See ko888 post above. The key factor is the +12v amps available. 65 +12v amps is recommended, more for OC.
The CX750 has 62 +12v amps. It is reasonable to assume if you have a "K" processor, you intend to OC.

Considering you are short on +12v amps to begin with, you should upgrade to a good quality 850w or greater PSU.
I might also suggest considering your current components being of a high end nature that you step up in
quality from a budget/entry level PSU such as the CX series.

If you post a budget, we can assist you in finding one.



If I were you I would get the power supply I have seeing as we have similar builds. I have a Corsair AX860i and it works amazingly well with my GTX 780s in SLI and 4770K OC'd to 4.4 GHz. You could save a few bucks getting the AX860 instead. I just wanted the added features of the i edition. Stellar power supply.
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March 12, 2014 10:58:00 AM

I got a pretty similar setup

I7 4770k @4.2
asus gtx 780 sli
seasonic 850 gold

And i try'ed to check the watt with a power consumption meter and it goes from 550-650W during games in BF4

So i say a 850w gold is more than enough :) 
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a c 2020 ) Power supply
a c 765 U Graphics card
March 12, 2014 3:25:54 PM

So i say a 850w gold is more than enough < AGREE
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