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GeminII-Duct-Experiment

post #1 of 11
Thread Starter 
today i finally tested how a duct would affect cooling performance.
the following picture explains how it works:



i made the duct from a pizza box.
and a lot of tape...

i used OCCT to load my e6420 @ 3.36Ghz and measured temps at idle, OCCT at 15 secs, and OCCT at 15 mins.

normal setup
idle core ..........1: 32
idle core ..........2: 32
load 15sec core 1: 47
load 15sec core 2: 47
load 15min core 1: 52
load 15min core 2: 52

ducted setup
idle core ..........1: 32
idle core ..........2: 32
load 15sec core 1: 47
load 15sec core 2: 47
load 15min core 1: 53
load 15min core 2: 53

as you see, temps raised by a single degree at 15minutes of OCCT (which probably caused by slightly higher ambient temps, which increased from 23 to 24 during the tests)

conclusion: the duct does not increase or decrease performance significantly.
i suspect the HS to have been at its CFM max already with the Thunderblades.
this leads me to a second conclusion, which is somewhat more positive:
the GeminII does not need much CFM nor pressure to perform at its best.
due to this, silent fans will be almost equally effective as higher noise, higher CFM ones. this means the geminII can be used in silent PC's while still offering overclocking potential almost as great as other PC with high airflow.

2 days ago i tested how it would perform with both fans turned off.
idle temps rose from 34 to 37, cant remember load temps, but they didnt increase dangerously either and didnt exceed 60C. however, i didnt give the CPU 15 mins to heat up properly, so the test was flawed.

all these tests were conducted with the sidepanel removed. since the original purpose of this duct was to suck in cold air from the outside when the panel (with 2 blowholes obviously) was on. therefore, another test will be conducted at a later point in time with the sidepanel on.
post #2 of 11
Not a bad test. I would have expected at least a C or two drop since you're losing the dead zones and using ALL of the air the fans push. Good job.
post #3 of 11
Get a shroud from a watercooling store and see if that is any better.
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post #4 of 11
Good tests! It's always interesting to try out different ideas on our setups, if only to challenge/prove assumptions about whether or not an idea may work.

Even so-called "failures" (or, a test which does not produce an expected result) can be instructive, in my opinion. Often these are the best kinds of tests, because they can lead you to alternative solutions to try.

Good job!
    
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post #5 of 11
got any pics of the duct?
post #6 of 11
Thread Starter 
the duct is as i drew it. it covers the sides of the fan, all the way to the sides of the HS, and its made of thin cardboard. looking trough the fans i can exactly see the HS.
dont have a camera, sorry.
post #7 of 11
Were you still using air from inside your case? I was thinking about ducting air from outside my case straight into the cooler, curious if you did that or still let it draw from inside the case.
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post #8 of 11
Thread Starter 
Quote:
Originally Posted by ChielScape View Post
all these tests were conducted with the sidepanel removed.
plz, just read it next time.
post #9 of 11
hmm

not bad
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post #10 of 11
Quote:
Originally Posted by ChielScape View Post
plz, just read it next time.
Sorry, I missed it the first time. Please forgive me oh great one.
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