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What do you consider to be a "Passively cooled CPU" - Page 3

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 #21 of 27
Basically in order to be considered a passively cooled CPU, you can have normal case fans, and normal fans in other components, but no fan on the CPU heatsink, and no fan nearby the CPU for the purpose of cooling it.

There are also "forced air" cooling setups that a lot of servers use, where a lot of air is forced through the case, so that none of the components need a fan on them. This is of course not "passive", as the heatsinks rely on the increased air flow to cool the components.
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post #22 of 27
Any heat sink that DOES NOT have a fan on it.
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post #23 of 27
Quote:
Originally Posted by Crazy9000;13362131 
There are also "forced air" cooling setups that a lot of servers use, where a lot of air is forced through the case, so that none of the components need a fan on them. This is of course not "passive", as the heatsinks rely on the increased air flow to cool the components.
That actually sounds like it would be a passive cooling situation. Passive doesn't mean "no airflow and basking in it's own heat byproduct". The very definition of passive means the cooling (heatink) of the component it is attached to both has no fan, and relies on the cooling of something OTHER than itself, regardless of what/where it is. In fact, most passive stuff COUNTS on the airflow around it to compensate. That is the definition of passive. So technically, no fan means it's passive, period.

To add to that, yeah, I'd say a fan dedicated to the purpose of cooling the component, that is close enough to the component, even if not attached, would be a "grey area" exception. It'd still be passive by definition, but would be "cheating" essentially. If that source of cooling is for something else (like exhaust) and just so happens to ALSO be the method of cooling for the CPU (ala, like my example of how many Dell PCs do it with a shroud), then it's totally fair game to be called passive.

To summarize, if it has no fan, it means it's passive, period. The lone exception is "cheating" by having a "spot cooling" fan for the SOLE PURPOSE of cooling the CPU, namely one within the case that isn't otherwise there for case airflow (intake/exhaust).
Quote:
Originally Posted by Machiyariko;13362087 
It sounds like the general consensus is that this setup is not passively cooled.
Is that a "spot cooling" fan that could be considered a "fan that is for the sole purpose of cooling the CPU despite not being affixed to the CPU's heatsink"? If so, then I wouldn't "consider" it passive for sake of a competition, although it is passive by definition. If it's moreso for airflow of the case and such that just so happens to be directly in line with the CPU, I'd say it's fair game.
Edited by Princess Garnet - 5/2/11 at 11:15pm
post #24 of 27
Deltas. Deltas everywhere.
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post #25 of 27
No fans dedicated to moving air through the heatsink, from any distance.
post #26 of 27
If you want to get technical..Passive CPU cooling would mean no heatsink aswell IMO... When some one says they have a Passivly cooled Chip I think of just a bare chip. kinda of like how a lawn mower engine is passivly cooled..VW Air cooled engines aswell.
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post #27 of 27
Quote:
Originally Posted by Princess Garnet;13362275 
That actually sounds like it would be a passive cooling situation. Passive doesn't mean "no airflow and basking in it's own heat byproduct". The very definition of passive means the cooling (heatink) of the component it is attached to both has no fan, and relies on the cooling of something OTHER than itself, regardless of what/where it is. In fact, most passive stuff COUNTS on the airflow around it to compensate. That is the definition of passive. So technically, no fan means it's passive, period.

To add to that, yeah, I'd say a fan dedicated to the purpose of cooling the component, that is close enough to the component, even if not attached, would be a "grey area" exception. It'd still be passive by definition, but would be "cheating" essentially. If that source of cooling is for something else (like exhaust) and just so happens to ALSO be the method of cooling for the CPU (ala, like my example of how many Dell PCs do it with a shroud), then it's totally fair game to be called passive.

To summarize, if it has no fan, it means it's passive, period. The lone exception is "cheating" by having a "spot cooling" fan for the SOLE PURPOSE of cooling the CPU, namely one within the case that isn't otherwise there for case airflow (intake/exhaust).Is that a "spot cooling" fan that could be considered a "fan that is for the sole purpose of cooling the CPU despite not being affixed to the CPU's heatsink"? If so, then I wouldn't "consider" it passive for sake of a competition, although it is passive by definition. If it's moreso for airflow of the case and such that just so happens to be directly in line with the CPU, I'd say it's fair game.

No, that is not passive cooling. It doesn't matter where the fans are, anything more then the natural airflow of a case, designed just to remove general hot air from the case, will make it no longer passively cooled. If it needs an extra fan ANYWHERE, then it's no longer passive. Passive cooling explicitly means you can throw the device into an average PC with just two case fans, and it will work as long as you don't overclock.

Forced airflow is a separate type of cooling, and nobody claims that it's passive.
Quote:
Originally Posted by AdmiralThrawn;13362286 
No fans dedicated to moving air through the heatsink, from any distance.

This is a good definition.
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