dual fan setup on cpu heatsink ?

[majorhavoc]

was wondering if anybody has tried using 2 fans on heatsink and how much of a gain does it add, I have a xigmatek 1283 in my sons computer and the new 1284 going in mine thanks.

 

[rodney_ws]

Something tells me that if were truly a good idea it would have been done a billion times already. I imagine at some point there is a diminishing rate of return when it comes to airflow and heat loss... I'm guessing that one fan setups have already reached that point. You're better off using a second fan to intake cool air or exhaust hot air from your case.

 

[mrmez]

2 fans have been used billions of times, but it IS a case of diminishing returns.
The best setup is a straight push+pull config (assuming u have that type of sink). It works best in high density heatsinks.

 

[Raviolissimo]

the design guidelines spelled out in Scott's convective cooling handbook, recommend plenum space (or "free air", e.g. air outside computer) before and after a fan. he has a more eloquent way of putting it but basically, it's not good to jam the fans together.

if you want more cooling ness, the 120 mm x 35/36/i forget is a good choice.

Scott was an engineer at Varian who did a lot air-cooling on travelling wave tubes, where 10 kW with a 10% duty cycle is a typical load to be cooled. he kept loads of lab notes and eventually curve-fitted his work. he came out with a small light-blue textbook that i got a copy of in the mid-80's and used a lot working in Silicon Valley.