Thread: (NVIDIA) Fan-Based-Heatsink Designs are probably wrong. (suck, don't blow ! heatfins direction)
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Old August 18th 12, 08:59 PM posted to alt.comp.hardware.pc-homebuilt,alt.comp.periphs.videocards.nvidia,comp.arch,sci.electronics.design
John Larkin
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Default (NVIDIA) Fan-Based-Heatsink Designs are probably wrong. (suck, don't blow ! heatfins direction)
On Sat, 18 Aug 2012 19:19:11 +0200, "Skybuck Flying"
wrote:

Hello,

I am starting to believe that NVIDIA's Fan-Based-Heatsink Designs like the
recent GTX 690 are totally wrong !

And here is why:

The heatsink fins are placed in the same direction as the airflow. This will
cause dust to easily get stuck between the heatsink fins and especially in
front of it.

THIS IS WRONG. This will cause the heatsink to get full of tiny little hair
pieces and dust particles.

HERE IS HOW TO RESOLVE/IMPROVE THE SITUATION:

Place the heatsink fins 90 degrees turned so that the overflow must go OVER
the heatsink fins and not in between.

So here is a picture to show the wrong situation and the better situation:

top view of card when place on table:

1. WRONG DESIGN:

HEATSINK FINS:

---------------------
------------------------
+-------+
--------------------- ----- airflow | FAN
--airflow--- -----------------------
+-------+
---------------------
-----------------------

2. BETTER DESIGN:

| | | | | |
|
| | | | +------+ | | |
| | | | ---- airflow | fan | --- airflow | | |
| | | | +------+ | | |
| | | | | | |


This better design should hopefully and be designed in such a way... that
air/heat GETS sucked out of the heatfins by blowing air OVER IT and not in
between... to reduce the chance of stuff getting stuck in it !

And reduce the chance of getting heat out of it.

Even better, aim the fan at something else a foot or two away.

You are of course assuming that you know more about cooling a CPU than
all the people who currently make a living cooling CPUs, including the
MEs in charge of thermal design at Nvidia.


I have this theory that the fins of a heat sink should reduce a fan's
free-flow rate by 50% for optimum heat transfer.


--

John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

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