Power supply for liquid cooling

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Superdrue

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May 28, 2014
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Yo

Im building a computer with a asus 780 ti and a 4770k. i want to overclock both. Im planning to run with a H110 to start with, but i may want to go with a custom watercooling loop later on. How many watt do i need in my psu to run with a custom loop ? Thank you :)
 
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Ubrales


I have the Corsair HX 850 and the Corsair AX 850 - both are great PSUs, and never had any issues. The "i" series are their newer ones.

This comes well recommended, and a little expensive: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139041

Other choices: on sale (or promo) - you won't go wrong with any of the following:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817207028
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151102...
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iron8orn

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I dont think its hardly enough to even calculate into the build.

I am not trying to tell you what to do with your system but it will be very nice and not really need a oc for gaming. mostly thinking about the video card since it is the most expensive part and would be the first thing to die if oc.
 
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JackNaylorPE

JackNaylorPE

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I'd strongly advise against a 100i .... if you must use an AIO, use the H110 .... the latter allows you to be in the same room with your PC without the noise driving you bonkers.

The only power increase associated with watercooling is the pump wattage

So ..... Go to Guru3D and look up how many watts you need for your gfx card .... for example

http://www.guru3d.com/articles_pages/geforce_gtx_780_ti_review,8.html

Here is Guru3D's power supply recommendation:

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

I'd suggest a 850 watter for slightly overclocked SLI system (650 for single card) .... my system w/ twin 780-s pulls about 770 watts from the wall under Furmark which leaves the CPU lightly loaded (about 100 watts below CPU max wattage overclocked)

So 770 at the wall is about 693 output and add 100 for the unloaded CPU = 793. So an 850 should work.... Since PSus are most efficient at 50% load, and because I had two pumps, I went with a Seasonic X-1250.

A HX 850 should be fine for that usage.

Heat wise....

Overclocked 4770k = 140 watts
Overclocked 780 Ti = 300 watts
MoBo Water Block = 20 watts (each)
DRAM Water Blocks = 5 watts each
Pump = 20 watts (each)

So a 1 pump system w/ twin GFX cards and CPU with MoBo block and no RAM blocks would produce about 780 watts

Look for 60% of that to be handled by ya rads if targeting a Delta T of 10C or 468 watts.

A Ut60-280 and XT45-420 will provide about 420 watts of cooling in push and 508 in push pull w/ 1250 rpm fans (Phanteks SP140s recommended.

I'd strongly suggest the MSI 780 Ti as it;s $100-$120 less than everyone else's and it's also the highest rated (Asus this time got lowest rating)

MSi 780 Ti ($600) w/ 9.9 rating
http://www.techpowerup.com/reviews/MSI/GTX_780_Ti_Gaming/29.html

Asus 780 Ti ($720) w/ 9.4 rating
http://www.techpowerup.com/reviews/ASUS/GTX_780_Ti_Direct_Cu_II_OC/29.html


 
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Ubrales

Ubrales

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Dec 3, 2009
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Yes 750 watts will be fine. Sometimes a higher wattage PSU will be on sale or promo for a price lower than the 750 watts model. (Please see my updated post above).
 
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Superdrue

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Thank you both for great help :) But since i may be the worlds greatest computer noob i just want to make sure. With a 750 watt psu i can run a overclocked cpu and a single overclocked gpu with a watercooling loop ? i see most pumps need about 24 watt
 
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JackNaylorPE

JackNaylorPE

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650 watts is more than enough for one 780 Ti GFX card....

1. At least according to nVidia

http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-780-ti/specifications

Thermal and Power Specs:
95 C= Maximum GPU Tempurature (in C)
250 W = Graphics Card Power (W)
600 W = Minimum System Power Requirement (W)
One 8-pin and one 6-pin = Supplementary Power Connectors

2. As seen above Guru3D tested the cards wattage draw with instrumentation

3. I have a 25% OC on twin 780 cards and the CPU at 4.6 Ghz and I am only pulling 770 watts from the wall.... that's only 690 watts of PSU output with two cards.

It's wise to plan for a second card in the future for a quick and easy upgrade / extension to your system's life..... not like there's a huge cost difference between a 650 and 850 watter....and you'll probably get it back in energy cost savings .... PSUs are most efficient at 50% load.

BTW, better move if ya want that $600 780 Ti .... last time MSI had the cards on special it only lasted a few days.



 
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Ubrales

Ubrales

Polypheme
Dec 3, 2009
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I have the Corsair HX 850 and the Corsair AX 850 - both are great PSUs, and never had any issues. The "i" series are their newer ones.

This comes well recommended, and a little expensive: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139041

Other choices: on sale (or promo) - you won't go wrong with any of the following:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817207028
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151102
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139011
 
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JackNaylorPE

JackNaylorPE

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Oct 30, 2004
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The HX has better voltage regulation and lower ripple than the AX series ....it's also a lot cheaper. I had recommend the Seasonic X Series as the "king of the hill" for along time but the X series price had skyrocketed in recent months. The X-1250 I bought in October for $225 was $350 few weeks ago....now it's a reasonable $229 again. The X-850 (10.0 performance rating on the 1250 / 850 not tested ) is $154 right now and with the HX (10.0 performance rating) now $149 and the AX860i (10.0 performance rating) at $229.... I'd take the X-Series 1st / HX second and the AX last unless the monitoring software excites you.

The Corsair RM Series, TX V2 series and XFX Core Editions should be looked at (9/5 territory) if budget an issue.
 
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