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What PSU should I get for a dual GTX 780 Superclocked build?

Last response: in Graphics & Displays
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June 13, 2014 5:21:35 PM

Right now I am considering an Antec 750W 80+ Platinum Certified ATX Power Supply for just a single GTX 780 Superclocked along with an MSI z97 Gaming 9 AC mobo, an i7 4770k (OCed) processor, an H110 Liguid Cooler, a Corsair Dominator Platinum 16 GB, a Seagate Barracuda 3 TB hard drive, and a Samsung EVO 250 GB SSD.

I was wondering if I were to add a second GTX 780 Superclocked to the build (probably later, eventually), would an Enermax Platimax 850W Platinum Power Supply be sufficient? And if not, what would you guys recommend? Price range preferably from $100 - mid $200's.

Thank you and there is any other info you may need let me know!
a b ) Power supply
June 13, 2014 5:34:25 PM

I think it's 683 W crossfire GTX 780. Since you OCed, I'd say go safe with a Corsair AX860i, RM850, or a Seasonic one.
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a c 141 ) Power supply
June 13, 2014 5:36:20 PM

750 watts is short for twin 780s.

Quote:
Here is Guru3D's power supply recommendation:

GeForce GTX 780 - On your average system the card requires you to have a 550 Watt power supply unit.
GeForce GTX 780 2-way SLI - On your average system the cards require you to have a 800 Watt power supply unit as minimum.
GeForce GTX 780 3-way SLI - On your average system the cards require you to have a 1200 Watt power supply unit as minimum.

If you are going to overclock your GPU or processor, then we do recommend you purchase something with some more stamina.


I have twin 780s and on Furmark they pull about 770 watts from the wall....while that's only about 700 watts PSU output, remember output drops (capacitor aging) as PSUs age and ya never wanna be up at the rated limit as noise and voltage instabilities arise.

Electricity savings is not the reason to look at the "precious metal" rating, reasons to do so are:

1. To get a higher rating, you need to use better quality components.
2. Better quality components are more efficient and generate less heat
3. Better quality components have less capacitor aging
4. Better quality components have superior voltage regulations for higher OC capability
5. Better quality components have less noise for better OC stability
6. Better quality components have more headroom above rated voltage
7. Better quality components producing less heat make less noise.

In order of preference ......

$155 - Seasonic X-850
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$150 - Corsair HX850
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$190 Seasonic SS-860XP2
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$180 Corsair AX 860
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$120 - EVGA Supernova
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$230 - Enermax EPM850EWT
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$220 Corsaie AXi
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

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a c 147 ) Power supply
June 13, 2014 5:37:42 PM

850w would be about right for sli. If you are worried, a bit stronger is ok, you will only use what is demanded of it.
The price premium of gold or platinum will not be worth any electricity savings.
The main advantage of such units is quieter peak operation.

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June 13, 2014 5:57:59 PM

JackNaylorPE said:
750 watts is short for twin 780s.

Quote:
Here is Guru3D's power supply recommendation:

GeForce GTX 780 - On your average system the card requires you to have a 550 Watt power supply unit.
GeForce GTX 780 2-way SLI - On your average system the cards require you to have a 800 Watt power supply unit as minimum.
GeForce GTX 780 3-way SLI - On your average system the cards require you to have a 1200 Watt power supply unit as minimum.

If you are going to overclock your GPU or processor, then we do recommend you purchase something with some more stamina.


I have twin 780s and on Furmark they pull about 770 watts from the wall....while that's only about 700 watts PSU output, remember output drops (capacitor aging) as PSUs age and ya never wanna be up at the rated limit as noise and voltage instabilities arise.

Electricity savings is not the reason to look at the "precious metal" rating, reasons to do so are:

1. To get a higher rating, you need to use better quality components.
2. Better quality components are more efficient and generate less heat
3. Better quality components have less capacitor aging
4. Better quality components have superior voltage regulations for higher OC capability
5. Better quality components have less noise for better OC stability
6. Better quality components have more headroom above rated voltage
7. Better quality components producing less heat make less noise.

In order of preference ......

$155 - Seasonic X-850
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$150 - Corsair HX850
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$190 Seasonic SS-860XP2
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$180 Corsair AX 860
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$120 - EVGA Supernova
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$230 - Enermax EPM850EWT
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$220 Corsaie AXi
http://www.newegg.com/Product/Product.aspx?Item=N82E168...



So, just to clarify, the Enermax Platimax 850W Platinum Power Supply would be sufficient for the specs that I want to get along with the 2 780 Superclocks?
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Best solution

a c 147 ) Power supply
June 13, 2014 6:06:52 PM

The enermax 850 would be sufficient, but considering the price difference and the excellent quality of the Seasonic X-850 that jacknaylorPE suggested I would buy the X850 unit.
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a c 141 ) Power supply
June 13, 2014 6:08:46 PM

Everyone of them is sufficient for any two single GPU card system. If they were all the same price, I'd still take the first two still get my vote tho.
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June 13, 2014 6:42:35 PM

JackNaylorPE said:
Everyone of them is sufficient for any two single GPU card system. If they were all the same price, I'd still take the first two still get my vote tho.


Thank you so much! Brings the price down too! :) 

I've been doing my best to get this build done, and done well. I want to make sure I have all the details laid out before I actually buy anything! I also want to make sure everything will work together whenever I upgrade to the dual cards and greater power supply. Thanks again!
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June 13, 2014 6:43:07 PM

geofelt said:
The enermax 850 would be sufficient, but considering the price difference and the excellent quality of the Seasonic X-850 that jacknaylorPE suggested I would buy the X850 unit.


Thanks immensely!
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a c 147 ) Power supply
June 13, 2014 7:07:58 PM

I think using more than an 850w psu is likely to be a waste. New graphics cards will be built to no more than 300w standards. That will be possible because of smaller manufacturing technologies to come.

I would buy the 850w unit up front. Overprovisioning a bit is ok. The psu will only use what it needs regardless of the max capability.

Actually, I see a single card replacement for the GTX780 as a possible upgrade next year.
Something strong will be needed to be able to game on the 4k monitors that are starting to appear.
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a c 141 ) Power supply
June 15, 2014 10:56:17 AM

I was stuck between the 750D and the 900D .... one was too big, one was too small. Then I found the Enthoo Primo ..... felt like Goldilocks .... it was "just right". :) 
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