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CPU heatsink/fans that blow down

B

BadRobot

Senior member
Seems like a lot of the heatsink/fans for CPU's that get high ratings do not blow at the mobo.

Normally I wouldn't care which way it blows as long as it works well BUT I am going to be using the xclio windtunnel and because of how the airflow in the case works I have a feeling that a downward blowing fan would work better...

Anyone have any ideas on this subject? I'm looking for any comments on the airflow for this setup and any recommendations on CPU heatsinks/fans.

Thanks
 
Most coolers with a top mounted fan, like say, the Thermalright SI-128 are designed for the fan to blow down thru the fins, thus cooling the area around the socket as well.

Most new tower type coolers still require that the fan blow thru the fins, and in most cases the fan blows thru the fins towards the back panel mounted exhaust fan. I guess the choice depends on how you like your cup of tea!
 
I've always preferred heatsinks that blow air across the fins versus against them.
Mainly because of what I was taught years ago in an EE class on heatsink designs.
There is a problem called standing waves when you blow against a heatsink.
You also get pressure forced back onto the fan resulting in more noise and requiring a more powerful fan.

If the heatsink is designed properly they already knew about standing waves and made the design to avoid it.

I personally use an Arctic Cooler freezer 7 pro.
Has the design I prefer with the air blowing across the fins rather than down.
http://www.ewiz.com/detail.php?name=FAN-AC7PRO
 
There are a lot of them. All the Zalman radial fin designs, the Tt Orb/Max Orb, Thermalright has 90 and 120 mm sizes, Lots of Coolermasters (avoid the Gemini as the aluminized paint flakes off the plastic housing - potentially causing electrical shortings). Asus Triton 75 (claims capable of passive operation - no fan, so maybe with the air from the big 250s, it really could run (at least locally) passive... Low as $31.00 at eWiz.com oooh, Silverstone NT06 too - expensive but sound like it's worth it : http://www.newegg.com/Product/...x?Item=N82E16835220019.

And there is always the option of making a shield for your front to rear aiflow HSF.

.bh.
 
With the right case, you can make your own heatsink duct that gives you the best of both designs. Most of the air blows directly through the Ninja and out the top exhaust in the case. But a small part of the airflow leaves the sides of the ninja, and blows downward at the ram, and the MB components on the other side. With this heatsink duct I'm able to runn the entire computer off the single fan.

Ninja Wing Duct....DIY
 
Originally posted by: PowerHungry42
I only know of the Thermalright SI series and the Enzotech extreme X coolers.
Click to expand...

Thermalright XP series as well. I have an XP-90 on my Core 2 Duo 6400. I prefer down blowing design as it also cools the chipset/mosfet area.
 
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