GTX 790 water cooling

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mohsen_mln

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hi, i'm going to buy GTX 790 when it release which should be soon enough, i am considering to buy EVGA my real question is should i get the hydro version i know no one can tell the difference for now but when you compare older nvidia GPU air cooled and water one does it worth to get water cooling ? i aim to overclock my GPU as i can also can anyone say how much does it cost to get cooling system to handle GTX790 which i believe should be the same as titan in the case of cooling demand.
i am using corsair H70 for my i7 4770k CPU now which i think it should do fine so i need a loop for the vga only, thanks
 
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manofchalk
The GTX790 is completely hypothetical at this point, it could be a 450W beast and make our recommendations completely useless (as well any air-cooler for the thing :lol:)

Water-cooling GPU's brings a fairly large benefit, more than the CPU does at any rate. Typically the major differences come in temperature and noise, overclock ability on graphics cards tend to be dependent on quality of the chip itself rather than hitting a temperature ceiling, though that is changing given the newer overclocking methods like Powertune in which the card clocks itself based on power, temperature and fan speed (ie, noise) thresholds.

Typically an upgradeable CPU only loop would cost about $300, given that GPU blocks are generally more expensive I...
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P1nnacle

P1nnacle

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Watercooling is quite beneficial to GPUs, and can greatly lower the temperatures at load. The GTX 790 is just a rumor right now, so it is impossible to make an informed response to what you would neet to cool it. That said, if it is real, and if EVGA releases a Hydro series, then all you should need is a pump, reservoir, and radiator to complete the loop.
 
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manofchalk

manofchalk

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The GTX790 is completely hypothetical at this point, it could be a 450W beast and make our recommendations completely useless (as well any air-cooler for the thing :lol:)

Water-cooling GPU's brings a fairly large benefit, more than the CPU does at any rate. Typically the major differences come in temperature and noise, overclock ability on graphics cards tend to be dependent on quality of the chip itself rather than hitting a temperature ceiling, though that is changing given the newer overclocking methods like Powertune in which the card clocks itself based on power, temperature and fan speed (ie, noise) thresholds.

Typically an upgradeable CPU only loop would cost about $300, given that GPU blocks are generally more expensive I would expect to be spending about $350 on water-cooling the card (if you factor in how much more a Hydro costs). Given its dual GPU, your probably dealing with a 300-350W TDP, so I would be looking at a 360mm radiator.
 
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P1nnacle

P1nnacle

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My only change would be the radiator, there is almost no reason for a 360+ radiator (unless you have something like 4 way SLI), I had a 3 way SLI + CPU that ran excellent under a 240MM rad. $350 is about right with a hydro card, with out it the price will be around $500.
 
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P1nnacle

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about 37C Idle, 80C (100%) load. Note that this is with my fans running as slow as possible. It's about 27C Idle 75C (100%) load with fans on full blast. I used to have a 360 MM radiator with these huge fans that each pumped 250CFM (It sounded like a vacumm cleaner at full blast). The temps weren't much better (well load was improved to about 65C).
 
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manofchalk

manofchalk

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I wouldn't exactly define those temperatures as "running excellent", thats way too hot for me. I have dual 360mm rads for my 3570k and HD7970 (overkill I know, but my case had the room :p) and I'm getting maximum load temps of 40°C at a rough ambient of 20°C.
Though pretty skeptical of those numbers, your dealing with about 700W of heat there, a 60mm thick 360mm rad can only deal with about 320W at most while maintaining a 10°C delta.
http://martinsliquidlab.org/2012/04/12/alphacool-nexxxos-ut60-360-radiator/4/
I would have guessed you would have been running in the 100°C range under load, unless it is freezing where you live or you have some god-like fans.


 
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P1nnacle

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Well I guess my comment would be that there is more than one way to skin a cat. Here's the data I used for my design. I had access through my connections to an engineering program that people use for those super critical flow problems for stuff like gas and oil refining (so of course this was a top priority for them).
Water Cooled Chips
You really don't need a lot of water to flow through to keep a computer cool. So instead of going with more cooling area, I chose to pump the water through faster. If you don't let it get as hot in the first place, you don't have to cool as much.

Edit: My idle with low fans is 40C for the CPU and 36 C for the GPUs.
 
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redeemer

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An overclocked 780ti can use as much as 570watts!
 
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P1nnacle

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I don't because I'm poor :( No not really, I just don't want to convert my setup back into an air cooled machine. I also don't want to upgrade without building a second computer for the 570s to run as a folding unit.



Yeah but most of us don't build a watercooling system assuming it will run at 100% load all the time.
 
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manofchalk

manofchalk

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A 780Ti's official TDP is 250W, so overclocked I wouldn't expect more than 300W of power draw unless your looking at extreme LN2 and custom BIOS type stuff. The only cards I know of that can draw that kind of power were the 3rd party HD7990's, they were somewhere in the mid 500W range with synthetic benches.
 
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P1nnacle

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I agree, I've seen very few reviews of cards that can actually pull 500+ watts, that's nearing the limitations of the 8pin PCIE power lines even with the bus power.
 
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mohsen_mln

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thanks all for your comments obviously before i go for 360 radiator, i calculate and model what is going to happen to my pc :) but if you move flow faster it does not mean you get higher performance (its all about heat transfer ) and i believe it actually should lead to lower performance but i need to model it my self to see it in ANSYS, but you should consider when u move slowly u absorb more heat so the hotter water goes into radiator and the heat transfer from hot surface to the cold one is now faster as what matter is temperature difference, but before i can say for sure what is true i try to model some heat transfer with water and air to see the real differences and i try with different flow speed, ill post the result as i am done.
 
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