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Is my NH-D14 Faulty? [nearly resolved] - Page 6

post #51 of 103
Quote:
Originally Posted by ehume View Post
Hmm. I was thinking of the Raven 1 and 2. Raven 3 . . .

I think I would roll up some towels or something, make some soft tubes to lay the case on. That would leave space for the left grill to breathe.

And yes, leave the bezels on. Leave everything on that is on the case when it is standing upright. Remember, the purpose of the exercise is to compare the cooling power of the heatsink in two positions.

I recall an unanswered question: wicking. When the lowest part of a heatpipe is the bottom of the U, then gravity pulls the liquid phase of the working fluid down to the part of the heatpipe that is closest to the cpu. It is then vaporized and ascends the arms of the U to where it will surrender its heat to the fin stack, precipitate as liquid, and fall back to the bottom.

When your case is upright, the heatpipes are more like a C with extended arms. Gravity pulls the liquid phase down to pool in the lower arm of each heatpipe. In order for the liquid working fluid to reach the hot part of the heatsink, it must travel there like hot wax going up a wick - this is why candles work, BTW.

If wicking doesn't work properly in the heatpipe(s), the liquid phase will stay in the lower arm of the C until heat from the cpu travels down the arm by conduction and then vaporizes it. Only then will it expand to go through the heatpipe to release its heat and precipitate and fall.

Other users with earlier D14's said they were happy using it with its airflow pointed upward, using i7 9xx's and i7 8xx's. From that I gathered that wicking was working, and orientation didn't matter much. But that was then. Maybe now it's not working so well.

It just dawned on me that one could mount a D14 in your case, oriented sideways, with the heatpipes oriented horizontally as in a normal case. In that situation you would mount push and pull fans sideways as well, with the fans on the bottom and the top with the inter-tower space running from the bottom to the top fan. It would be weird, and only doable with ziptie screws (see my sig), but it would be a different orientation.
Wait, there's minor phase changes inside the heat pipes? I thought it was 100% dry and the metal was simply conducting the heat and making it travel up.

Well anyways, in that case, which is better? Having the case standing normally with the heat pipes facing sideways or putting the case on it's side. http://www.tomshardware.com/forum/19...al-orientation <-- States that it doesn't matter due to the wick.
Edited by Khaotik55 - 5/19/11 at 9:49pm
post #52 of 103
Thread Starter 
Quote:
Originally Posted by ehume View Post
Hmm...
I read most of the guides and reviews in your sig a while ago, and they are great. I haven't done any measurements, but wouldn't the fans need to be wider in order to get the most out of the D14 orientation you just mentioned. It would make it like an extra fat Super Mega, and i don't know if that is a good thing. I wonder how that orientation/setup would compare the Super Mega. Depending on the results from the test ill be doing this weekend, ill be giving it a try. And who knows, maybe you just thought of a new and ingenious way to use a NH-D14.
Quote:
Originally Posted by ehume View Post
That would leave space for the left grill to breathe.
Do you mean the grill in the back? It is pictured here.
http://www.chiphell.com/en/wp-conten...3/IMG_6097.jpg
If your wondering where im getting these pictures, here's the link.

Im going to need to remove the top cover in order to connect the cables while the case is placed on it's back side. Here's the pic of it:
http://www.chiphell.com/en/wp-conten...3/IMG_6098.jpg

There is a link that i can't seem to find at the moment that shows how 90* mobo cases like mine affect GPU temps. And it explains the reasoning which has to do with the heatpipes orientation mostly. Edit: This mostly applied for TRad series coolers(aftermarket GPU HS). It It did show that there was a drastic change in temps with different orientations. Edit: Here it is.

Some extra info regarding my case's cooling abilities.

Edited by nawon72 - 5/20/11 at 1:42am
post #53 of 103
Nice graph. What kind of heatsink did they use? Stock?

I don't mean what is in that pic. For the case-on-its-side test, I recommend putting it on rolled towels to avoid scratching the finish, and to allow the psu room to move its exhaust air, since the psu's air outlet is on the bottom front of the left panel. That psu air outlet is the grill I talking about.

Tom mentions wicking. And that's why I thought orientation made no difference. But what if it does? That's what you can test by laying your case on its side. If you get the same results, or nearly the same, or worse results, you know that the problem is not from failure in wicking.

BTW -- The Tt Frio OCK advertises a two-layer wicking system, so wicking seems to be an important issue (if only in marketing).
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post #54 of 103
Thread Starter 
Hmm, interesting... They used the Prolimatech Megahalems with a single Scythe S-FLEX SFF21F fan in push with ambient 24*C. So i'm assuming they know something we dont. Anyways, here's the whole setup used:

And i'm still unsure of how you want to to lay my case. From what you told me it seems like you want me to lay it down desktop style. That would mean the PSU exhausts out the top of the case. Im not sure if you know that the RV03 has the mobo on the right side, while the RV02 and RV01 have it on the left side. If you want me to lay it down so that it looks like a test bench, then let me know.

If your interested, here's the link of the review that compares the RV02 to the RV03. Its in chinese though, so you might want to use google chrome to translate.
Edited by nawon72 - 5/20/11 at 4:14pm
post #55 of 103
These pics had gotten me confused, but I get it now. The old case had the mb open on the right. The RV-03 is open on the left - conventional case style. The psu intake is open to the bottom and the exhaust is open to the left. So, no essential air intakes on the right.

Put down a towel and lay your case down on its right side. This will leave the motherboard horizontal with the heatsink on top of it with the heatpipes in the U position. Run whatever your stress test is.

Then set the case on its feet and run the stress test again. This will test the heatsink with the heatpipes in the C position.

Sorry I got mixed up. As I said, I wasn't very familiar with the RV-03.
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post #56 of 103
Thread Starter 
For my test i will take note of my room temp then run Prime95 small FFT's 30-40min(depends on how the temps change).

The OC im using is 4.6GHz, 1.35V, 0.040 offset, high LLC(50%), VCCIO+VCCSA normal, PLL 1.71875, 1.03 PCH, HT+EIST+C states enabled. The Vcore i said im using is not 100% accurate because it changes while under load, but it should be the aprox average.

I will be recording temps using Real Temp 3.67 and it will log temps every 5secs. Once i get the results ill delete everything after the time limit i set so that the results are from the same amount of testing time.

After testing, i will take the average temp for each core. I will then be able to average the cores to get the temp for the whole test.

- Let me know what you think of this. Ill start the testing now anyways since i think it should be ok.
Edited by nawon72 - 5/20/11 at 6:28pm
post #57 of 103
Generally when I am testing temps I run with a fixed Vcore. That way I don't have to worry as much about variables I don't control.
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post #58 of 103
Thread Starter 
Quote:
Originally Posted by ehume View Post
Generally when I am testing temps I run with a fixed Vcore. That way I don't have to worry as much about variables I don't control.
I know what you mean, but i my Vcore goes up or down 0.008 sometimes. So the voltage should average about the same and the test is just to compare the different orientations.

Testing has begun...
post #59 of 103
Quote:
Originally Posted by nawon72 View Post
Testing has begun...
Hooray!
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post #60 of 103
Thread Starter 
Quote:
Originally Posted by nawon72 View Post
For my test i will take note of my room temp then run Prime95 small FFT's 40min

The OC im using is 4.6GHz, 1.35V, 0.040 offset, high LLC(50%), VCCIO+VCCSA normal, PLL 1.71875, 1.03 PCH, HT+EIST+C states enabled. The Vcore i said im using is not 100% accurate because it changes while under load, but it should be the approximate average. My Vcore goes up or down 0.008 sometimes but the voltage should average about the same and the test is just to compare the different orientations.

I will be recording temps using Real Temp 3.67 and it will log temps every 5secs. Once i get the results ill delete everything after the 40min so that the results are from the same amount of load time.

After testing, i will take the average temp for each core. I will then be able to average the cores to get the temp for the whole test.
21*C ambient, case fans(AP181) on low(700rpm 18db), Y-splitter for fans

Heatsink orientation:


Fan Position:


TIM application
(i think it smeared a bit when i took the HS off):



Test 1:

The case is in its normal orientation. Average core temp was 68.456*C, so you could pretty much round up or down.

Test 2:

Case laying on its right side with books underneath to keep it off the ground. Average Core Temp was 66.87*C, so lets say 67*C.

Conclusion:

The orientation of the cooler has little effect on the temps.

Possible fault in my NH-D14. Side 1(faulty):


Side 2(not faulty?):

Please compare these pics with a NH-D14 that is known to perform well.
Edited by nawon72 - 5/20/11 at 11:15pm
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