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Custom 5 Euro Fan Duct ... - Page 2

post #11 of 16
Thread Starter 
UPDATE:
Big Fail. Actual Fans: 1 side panel ->push, 1 front-> push, 1 back-> pull, 2 top-> pull.

Installed Fan duct onto GPU:
dsc00959gw.jpg
By virlidi at 2011-08-21
dsc00961i.jpg
By virlidi at 2011-08-21
dsc00960mv.jpg
By virlidi at 2011-08-21

GPU temps:
2011082000h59gpucore.png
By virlidi at 2011-08-21
Before.
2011082120h42gpucore.png
By virlidi at 2011-08-21
After.

CPU temp after installation:
2011082120h42core1.png
By virlidi at 2011-08-21

Compared to the previous setting, this raised the temps of both, GPU and CPU. Could also be the side push fan (maybe arange as a pull fan? ). Or the case is simply too small and there's now a lag of air circulation. But damn, that was 3 hours for nothing mad.gif
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post #12 of 16
Thanks for the experiment. Data beats theory every time.

+rep
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post #13 of 16
Neat; it looks like you cut the CPU duct out of a 100-CD cakebox cap? I have one somewhere, I could take a dremel to it and make my own when I get my Hyper 212+ on tongue.gif
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post #14 of 16
i don't quite understand how that worked, where is it intaking air?
   
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post #15 of 16
Odd results wth.gif

You could make a duct to go around the whole card, remove the PCI brackets and then put fans at the back of the PCI slots to suck the air out.

The only problem with that is the DVi plug will be in the way, if only there was a way to move it to somewhere else.
post #16 of 16
Before adding GPU shroud:
GPU:73.5C
CPU:45C

After adding GPU shroud:
GPU: 77C
CPU:49C
(all are 6-min figures)

I will attempt to explain the data. I reckon 2 reasons for the higher GPU temp:-

1) The shroud is not large enough for free incoming air movement
a. Even though it is 2-slot wide, the 2 fans need to pull air in with a 90-degree turn. See the bent green arrows in pic 1 below. This imposes a relatively higher 'head-loss' which reduces the overall airflow.

b. The rear fan sucks a big portion of the incoming air (3 green arrows) while the front fan gets a smaller amount of air (only 1 green arrow). This reduces the cooling capacity of the card.

2) Incoming air is hotter than before
Previously air being sucked by the fans comes mainly through the side panel and the case front. Now, hot air from the PSU + CPU + GPU exhausted into the rear region of the case and gets sucked in through the 2 rear slots.
Note all the red (dotted) arrows.


As for the CPU, I have not seen any valid explanation yet.


Summarily, I suggest making a GPU shroud that goes to the front for fresh air intake (vs from the case rear region). Perhaps it can look like pic 2 below.
Keep up the experiment and good work!
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