This is correct and hugely dependent on the system setup (fan type/speed/CFM, heat sink configuration, PC case/component airflow design, etc., etc. etc.)
http://en.wikipedia.org/wiki/Heat_si...oretical_model
Note especially the part about "When the air flow is not ducted, a certain percentage of air flow will bypass the heat sink. Flow bypass was found to increase with increasing fin density and clearance, while remaining relatively insensitive to inlet duct velocity."
More proof that certain heatsinks are designed for profit (i.e.: Oooohh...Shiny!) and not necessarily efficiency.![]()
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