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The [Official] Noctua Club - Page 216

post #2151 of 3060

That vinyl dye is very nice.

 

I'll tell you what I did with my first case. Look at 10. in my sig. I had a 140mm Aerocool Shark on its 7v adapter. Worked out OK.

 

On the CM N600 and now on the R5, there was no room for a fan in the 5.25" bay. What I did on all three cases was to remove the back grill, and use a pull fan on the heatsink to exhaust the case by pulling the case air out with it. See item 2. in my sig to see my first case in action. With lots of open windows on the case and no fans running except the heatsink fan, there was a ridiculous amount  of suction, all going out the back.

 

If you think about it, you can just see that the rear "grill" is just some holes drilled in the back wall of your case. If you experiment you will see that the "grill" blocks more air than it passes. So removing it allows air to pass out of the case so much more easily and quietly.

 

Edit - this was the N600:

 


 The R5 rig is simpler.


Edited by ehume - 12/28/15 at 7:37am
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post #2152 of 3060
I agree. If you look at the front intake on my Storm enforcer, you'll see that I modified the front of the case to accept two 140mm fans, removed all grillwork and although it doesn't show in that pic, I eventually removed the grillwork behind the rear exhaust as well. I think it also dropped sound levels by about 4db having no interference with the airflow path, or at least, minimal. Airflow for the top intake, through the heatsink and out the back is pretty much a straight, direct shot, with nothing in the way. I have no filtration on this unit, so I have to blow it out like every two weeks, which is no problem as I have shop air plumbed throughout various locations in the house from the garage. Makes it nice and easy. A nearby air purifier rids the room of the particulates, so no worries on that account either.

Since I keep the doors to this area closed off from the other parts of the house for the most part, and run the purifier like once a week, very little dust is available to accumulate anyhow so it's a fairly efficient setup. I think the Define S will be even better as there are no drive cages at all between the front intakes and the HSF. I'm hoping to get a nice stable 4.8Ghz OC on this 6700k, which is still going to probably use less power than my current FX-8320@4.5Ghz does.

What is that heatsink you're using on that pic? It doesn't look familiar to me.
Edited by Darkbreeze - 12/27/15 at 9:32pm
post #2153 of 3060
Yeah, I don't like honeycomb and other grills either. They do have an effect on the noise and airflow. Haven't bothered removing it from my R5 rear fan slot yet. I run my fans at such a slow speed so the noise is not that big of a deal, it is restricting the airflow though.
Also, that's the Prolimatech Armageddon.

@ehume what's the term again for that airflow effect where you don't need a rear fan as you've removed the grill on the rear slot, the CPU fan's essentially handling the exhaust duty.
I see you did that with the N600. I've seen it done on SPCR forums multiple times. Haven't personally experimented with it.

Edit: I guess it's the bernoulli principle
Edited by lagittaja - 12/28/15 at 4:11am
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post #2154 of 3060

Prolimatech Armageddon. Since the core temps of the 4770K skyrocket when the overclock hits the inflection point, it does no good to put an NH-D14 or D15 there. But I have enough NF-A14's to put them in there the next time I blow out the case.

 

As for removing the rear grill, I call it "removing the rear grill.":-))

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post #2155 of 3060
I like the scientific jargon, "removing the rear grill". That's nice. What do you call it when you drive down the freeway backwards? Um, driving backwards.

I had problems initially getting my 8320 past 4.3Ghz. It wouldn't stabilize with less than 1.3v but I couldn't keep the temp below 60°C at 1.3v or higher. I swapped an NH-U14S in for the U12S that was on there, moved the front 200mm megaflow to the top, modded the rear fan location to accept a 140mm fan, modded the front of the case to accept two 140mm fans and voila, I was then able to go 4.5Ghz@1.325v and temps never go over 48°C now. If I try to go any higher on the clock, regardless of how I tweak the other CPU voltage settings, or raise the voltage past 1.325v, thermals either jump or I get instability if I stay at that voltage. Eh, anyhow, moot point as I'll be switching teams on this new build, so it's a bright new day.

And I don't think what you're referencing can be Bernoulli's principle, as that deals with FLUID dynamics, not thermal dynamics. I think what you're looking for is pressure gradient force, where air pressure tries to equalize by moving from areas of high pressure, like inside your case, to areas of low pressure, like out through the rear cutout or any other unsealed openings. If you add the additional factor of advection, where heated air tries to move to cooler areas, you have a very good environment for everything inside the case trying to get outside the case. Since pretty much everything, air, fluid, electricity, tries to take the path of least resistance, you can surmise that most of it will indeed draft straight through the rear opening although some will find it's way out other areas as well.

This will not, of course, apply in cases where there is no enclosure, as with having a side panel off, as there is unlikely to be much pressure differential nor near as much heat. The lack of that heat kind of makes the need for that to happen a moot point anyhow, so as long as you're getting airflow through your heatsink it probably doesn't matter in that case.

Or, I could just be way off base too. smile.gif
post #2156 of 3060

I think you have it almost right. The reason I reference Bernoulli's principle is that the pull fan on the heatsink sets up an exit stream. Air is a fluid here. The exiting air catches the ambient air in train and conducts it out the back. The other elements you mention reinforce this basic flow.

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post #2157 of 3060
Yeah, I can see that. In effect it acts as a draft, slipstream effect. Does anybody happen to know if the LGA 1150 mounting bracket is the same as the new LGA 1151? Just wondering if I'm going to need to contact Noctua for an adapter for my NH-U14S or not? I'm not really seeing much mention of it anywhere so I'm assuming they're the same, but with the recent Skylake rumors of damage I'd prefer to be certain.
post #2158 of 3060
Quote:
Originally Posted by Darkbreeze View Post

Yeah, I can see that. In effect it acts as a draft, slipstream effect. Does anybody happen to know if the LGA 1150 mounting bracket is the same as the new LGA 1151? Just wondering if I'm going to need to contact Noctua for an adapter for my NH-U14S or not? I'm not really seeing much mention of it anywhere so I'm assuming they're the same, but with the recent Skylake rumors of damage I'd prefer to be certain.

The socket has been the same since 1156 so you're good to go :)

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post #2159 of 3060
I figured that was the case, but I wasn't positive. Thanks.
post #2160 of 3060
Ditched the single P12 for a dual NF-A8 in the bottom. Now the 980 stays at 72ºC on load and I don't have those 80ºC spikes I was having since summer went full retard
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