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Passive cooled - max watts?

Bleek

Bleek

Bleek

Soldato
Joined
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What would be the maximum wattage of a passive cooled cpu?

I was thinking of running an mATX case with undervolted and underclocked Brisbane, say 0.9v at 1.5-2.0GHz, which means anything between 16 and 21watts (so says a calculator).

With a rear case fan extracting from behind the heatsink, would passive cooling be sufficient for the above chip or would I need to run sub 15watts?
 
Depends on the cooler and what you'll be doing with it really, probably wouldn't risk it with the stock cooler. If its gonna be idle 95% of the time it'll probs be fine on the stock cooler i guess.

If you get the biggest cooler that will fit in the case and their is some airflow in the case it will be fine even under load i would imagine.
 
Ok well I've found a 1.6GHz Brisbane at 0.75v on the net (another forum) drawing just 7w! It's passive cooled, low 30's, awesome! :D
 
Passive cooled with what though? Is there going to be ANY airflow around it? I would stick on the biggest lump of copper/aluminium you could find :)
 
Large heatsink and a fan drawing out the rear of the case as well as the PSU fan drawing out the rear.
 
Hey Edleake,

I have no idea of the figures and theory but I wanted to achieve the same outcome as you so I just approached it from a suck it and see viewpoint.

I've run my last three Intel® Core™2 systems passive and it works very well, in some examples it should be possible to use the standard heatsink if you have decent airflow but if you have some spare cash then just buy a performance heatsink and you will be laughing! :)

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Obviously my prefered cooler of choice is a Passive TRUE! :p
 
off subject

Sorry but a bit off the subject, see Big Wayne that you have used Asus p5q board and see that you have the ram in Yellow slots is it Dual channel?
Reason I ask is have just started a sim.build with dominator dual but 8GB so do I put the pairs ib sim. colour slots or side by side as book seems to state ie:-A1 B1 and A2 B2, bit confused as the previous builds didn't have as much ram and daul channel was easily sorted but am struggling this time.
The hope is to get the encoding time down in film/video editing.
Have got a quad yorkfield 2.8 to go with this lot so I need to get it right so advice would be much appriciated.
Thanks in advance
 
Well unless you are running solid state drives I dont see the point in "total" passive cooling... even if you silence or bungy mod the drives they are going to make "some" noise... some very low RPM fans are not going to be any louder...

You are best at looking at a couple of nice low RPM case fans and one low RPM heatsink fan... I honestly dont think it will be any louder than a silenced HDD
 
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