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What do you consider to be a "Passively cooled CPU" - Page 2

Poll Results: What setup would you consider to be a passively cooler CPU setup?

 
  • 4% (3)
    No fans on the heatsink but they are within 1-3 inches, lined up directly.
  • 4% (3)
    No fans on the heatsink but they are 4+ inches away, lined up directly.
  • 40% (26)
    No fans on the heatsink but there are fans in the chassis, not in line with the heatsink.
  • 15% (10)
    No fans anywhere near the heatsink.
  • 35% (23)
    No fans at all.
65 Total Votes  
post #11 of 27
Thread Starter 
The reason why I'm asking is that my current setup has option 2 and I'm wondering if you can really call that passively cooled.
I don't want to misrepresent myself in the case mod competition.
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post #12 of 27
The CPU would be passively cooled by simply having a heatsink with no fan attached to it. It relies on the airflow of other fans, or natural airflow if there aren't any, to remain cool.

A fan could be almost right next to it, but not attached, and it'd still technically be passively cooled. Unless the cooling on the CPU itself is active, then it's passive (relying on something other than the attached cooling).

There's also the scenario where there's some sort of duct or shroud (ala, a Dell) making a fan (such as an exhaust fan) almost double as the CPU fan. Even in this case, the CPU is still technically passively cooled. The fan is acting to cool the CPU, true, but it's still acting first and foremost as the exhaust, and the duct/shroud merely forces air being exhausted over the CPU heatsink first. That is the very definition of passive, something with no attached fan that relies on something else.

So, in short, to be passive means it has no fan on the heatink. That's all there is to it. Any other fans cooling it, lined up with it, etc., it's still passive.
Quote:
Originally Posted by Machiyariko View Post
The reason why I'm asking is that my current setup has option 2 and I'm wondering if you can really call that passively cooled.
If that's the case, "technically", yes, it is passively cooled, but since it may be up to interpretation, it depends. In definition, though, yes, I'd say you are passively cooled. The heatsink has no fan, and you're not just cheating by heaving it literally right on it without being attached.
Edited by Princess Garnet - 5/2/11 at 10:38pm
post #13 of 27
In order for the machine to even really function (assuming anything modern really), there HAS to be airflow of some kind. So most of the time, there HAS to be a fan installed somewhere.

So I voted option 3 in the poll. There has to be some sort of airflow (natural or fan made). But passive (just like everyone else said) just requires the HEATSINK to not have a fan on it.
 
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post #14 of 27
To add something that hasn't been mentioned, you can have a passively cooled component (GPU, CPU, etc.) in a non-passive case. In fact, most passively cooled components assume you have airflow in your case already and running 100% passively cooled can cause issues due to the lack of any airflow at all. There are ways to do a passively cooled case without any fans but it takes quite a bit of planning and research and performance is almost always sub-par.
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post #15 of 27
It all dpeends on what type of passive your talking about really... I'd voted for 5) because thats what a truly passive system would be.
post #16 of 27
Quote:
Originally Posted by jackeyjoe View Post
It all dpeends on what type of passive your talking about really... I'd voted for 5) because thats what a truly passive system would be.
If we were talking about the entire system, yeah, it'd be option five, but the OP is talking only about the CPU.
post #17 of 27
Quote:
Originally Posted by Princess Garnet View Post
If we were talking about the entire system, yeah, it'd be option five, but the OP is talking only about the CPU.
I'd noticed that just then...
post #18 of 27
I feel there's good deal of grey area here with the poll options.
If we're talking about passively cooled CPU, I wouldn't count the case fans, but that's just me I guess.

Quote:
Originally Posted by youra6 View Post
While you are faster this time, your post lacks the prose that makes mine so much better.
Touche good sir, had to bust ya a bit though for funzies
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post #19 of 27
Like IEATFISH said, the case or other components might have forced airflow, but if there is none dedicated to the CPU, I'd call that passively cooled.
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post #20 of 27
Thread Starter 
Here is a spy shot of what I'm talking about. Only showing the important stuff here, the fan, heatsink and memory for reference.



It sounds like the general consensus is that this setup is not passively cooled.
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Custom made computer desk
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