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Can a slim NexXxus ST30 240mm rad potentially cool both a CPU+GPU?

post #1 of 7
Thread Starter 
Greetings community,

Noob question, but I have literally been googling all over the net to get an idea what a slim 240 produce. Can a slim 240mm RAD cool a gpu+cpu?

What I got so far, is that for every part i follow this equation: 120mm rad+ 120 Overhead room for OC'n. In my case I want to cool a 4670k and my current GTX680 (will eventually upgrade). Is it safe? Or would I have to add another rad? + Rep for answering
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post #2 of 7
Yes, it is completely safe. It will simply mean that the water temp will be higher than it could be with more rad, which means higher CPU and GPU temps. What the temps will be exactly is hard to say, it depends on so many variables like the environment the rad is in (Internal or external) and the air flow it gets, fan speed and so on. It will easily be better than air cooled temps.

I don't have it in front of me right now, but I did some testing running a highly clocked 7970 and CPU on just a 240 and with 1750RPM fans it kept the water under 15C above ambient.
Edited by Jakusonfire - 10/21/14 at 11:40pm
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post #3 of 7
Thread Starter 
Thanks for the quick answer. +rep to you

I was about to reconsider my design I have with my upcoming mini-itx build. As for fans, I've also been reading that I need to acquire lower FPI fans to get the most out of the slim 240mm ST30 rad. Would I be fine with the current SP120s? Trying to aim for quiet build as well.
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post #4 of 7
Water cooling works well but it doesn't change the laws of thermodynamics. Small size, low temps, and quiet is not really possible. You really need to choose two and optimize for them.

SP120's will work fine with the ST30, they work fine with any radiator. Its really only fans with very steeply angled blades that don't work so well with radiators because they are designed to move as much air volume as possible with zero resistance. Of course a radiator is a lot of resistance so fans with good static pressure work best with them.
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post #5 of 7
Well of course will depend on CPU and GPU...... Assuming using the 680 and 3770k (~same as 4670k heat wise) in your current build, the system will produce about 200 watts + 130 watts overclocked.

That's 330 watts ....as much of the heat is taken care of from radiation of all your system components, on average in a modern SLI build, you'll need the radiator to cool about 60% of that ~ 200 watts.

You can download a EX radiator size estimator here which is based upon the charts you will find on martinsliquidlab.org.

http://www.overclock.net/t/1457426/radiator-size-estimator
http://martinsliquidlab.org/2012/05/01/alphacool-nexxxos-st30-360-radiator/4/

Using the ST30-240, you will get about

100 watts from EX series 240 rad at 1000 rpm in pull, 121 in push / pull
120 watts from EX series 240 rad at 1250 rpm in pull, 146 in push / pull
133 watts from EX series 240 rad at 1400 rpm in pull, 161 in push / pull
161 watts from EX series 240 rad at 1800 rpm in pull, 195 in push / pull

So yes, a 240 @ 1800 rpm in push / pull would suffice.....I'd expect a delta T of about 12C in worse case usage.

As a general rule of thumb, for a quiet system on Alphacool rads, maxing out at 1250 rpm w / 1 fan (2 fans) :

One 120mm per 100 (120) watts of system load
One 140mm per 135 (165) watts of system load

* That 60% number works well for 7xx SLI systems and I haven't done much experimentation of single GPU systems or with lower wattage GPUs.... lacking any hard data, I'd suggest a higher slightly higher percentage (say 65 %) for a single GFX card build as there's less surface radiation from components, tubes, rad shrouds etc.

The main reason for that however is that when in use, your GFX card and CPU are never stressed 100% at the same time so preparing for 100% CPU / 100% GFX card loading is something that you will just never see. For example, running Furmark only puts a 40 watt load on a Haswell CPU....meanwhile running CPU intensive stuff leaves your GFX card(s) producing very little heat.

High SP fans were all the rage in the days of 30 fpi rads .... with the ST30 (8 fpi) offers very little resistance. If you are disappointed with the Corsair SP's, I'd suggest the Phanteks F120SPs
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007998%20600035590&IsNodeId=1&Description=Phanteks&name=120mm&Order=BESTMATCH
Edited by JackNaylorPE - 10/22/14 at 5:15pm
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post #6 of 7
Thread Starter 
Quote:
Originally Posted by JackNaylorPE View Post

Well of course will depend on CPU and GPU...... Assuming using the 680 and 3770k (~same as 4670k heat wise) in your current build, the system will produce about 200 watts + 130 watts overclocked.

That's 330 watts ....as much of the heat is taken care of from radiation of all your system components, on average in a modern SLI build, you'll need the radiator to cool about 60% of that ~ 200 watts.

You can download a EX radiator size estimator here which is based upon the charts you will find on martinsliquidlab.org.

http://www.overclock.net/t/1457426/radiator-size-estimator
http://martinsliquidlab.org/2012/05/01/alphacool-nexxxos-st30-360-radiator/4/

Using the ST30-240, you will get about

100 watts from EX series 240 rad at 1000 rpm in pull, 121 in push / pull
120 watts from EX series 240 rad at 1250 rpm in pull, 146 in push / pull
133 watts from EX series 240 rad at 1400 rpm in pull, 161 in push / pull
161 watts from EX series 240 rad at 1800 rpm in pull, 195 in push / pull

So yes, a 240 @ 1800 rpm in push / pull would suffice.....I'd expect a delta T of about 12C in worse case usage.

Nvm, read your article and got my answer. Love the spread sheets you have there thumb.gif

As a general rule of thumb, for a quiet system on Alphacool rads, maxing out at 1250 rpm w / 1 fan (2 fans) :

One 120mm per 100 (120) watts of system load
One 140mm per 135 (165) watts of system load

* That 60% number works well for 7xx SLI systems and I haven't done much experimentation of single GPU systems or with lower wattage GPUs.... lacking any hard data, I'd suggest a higher slightly higher percentage (say 65 %) for a single GFX card build as there's less surface radiation from components, tubes, rad shrouds etc.

The main reason for that however is that when in use, your GFX card and CPU are never stressed 100% at the same time so preparing for 100% CPU / 100% GFX card loading is something that you will just never see. For example, running Furmark only puts a 40 watt load on a Haswell CPU....meanwhile running CPU intensive stuff leaves your GFX card(s) producing very little heat.

High SP fans were all the rage in the days of 30 fpi rads .... with the ST30 (8 fpi) offers very little resistance. If you are disappointed with the Corsair SP's, I'd suggest the Phanteks F120SPs
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007998%20600035590&IsNodeId=1&Description=Phanteks&name=120mm&Order=BESTMATCH

That was very informative. Thanks for the information! Aside from that, I have no problem with SP120s at all. Just trying to do as much homework before I pull the trigger on a few things.

So when you mentioned "8 fpi" = less resistance; therefore I don't have to run max fan rpm's? (for example, running my fans at 2400 rpm would be overkill?)
Edited by dejahboi - 10/22/14 at 11:29pm
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post #7 of 7
I
Quote:
Originally Posted by dejahboi View Post

That was very informative. Thanks for the information! Aside from that, I have no problem with SP120s at all. Just trying to do as much homework before I pull the trigger on a few things.

So when you mentioned "8 fpi" = less resistance; therefore I don't have to run max fan rpm's? (for example, running my fans at 2400 rpm would be overkill?)

You can downloaded the wattages on that OCN link in post above ....separate files for each rad manufacturer.

At 2400 rpm, I'd have to put the PC in another room .... this is what 2000+ rpm sounds like (Play the H100i video and listen) .... once it hits 55% CPU load, that's past my tolerance level.

http://martinsliquidlab.org/2013/03/12/swiftech-h220-vs-corsair-h100i-noise-testing/

I use 1250 rpm 140mm fans and keep them between 325 and 850 rpm .... you can't hear them at 850.... at 1250 they are tolerable for short duration, probably unnoticeable to most ....I'm find fan noise too distracting while working so am sensitive to it.

161 watts from EX series 240 rad at 1800 rpm in pull, 195 in push / pull

So yes, a ST30-240 @ in push / pull at 1800 rpm in pull, gives you 195 watts of cooling (good for about a 325 watt load)..... I would imagine that an 1800 rpm fan running at 1800 rpm would be more efficient than a 2700 rpm fan at 1800 rpm.


With 330 watts load, an ST30-280 w/ 1250 rpm fans in push / pull would be perfect and very quiet
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