How to mount a fan on video heatsink?

[gwallen4]

Anybody have any ideas how to do this or maybe another way of cooling the video processor?

Shuttle AK31 Rev. 3.1 Motherboard with VIA 266A
AMD Athlon XP 1700+ CPU, not overclocked.
Cooler Master DP5-6131c CPU Heatsink and fan
Arctic Silver Thermal Gel
Matrox G450 eTV

During video intensive games the video frame rate will suddenly drop to 1 per 2-3 secs, the mouse slows way down, and any action in the game is suspended, music continues however.

After 90 or so secs the video unfreezes and the game continues as though nothing happened - I guess when the video chip cools down from inactivity.

CPU temp when freeze occurs - 50C
CPU temp at idle 46.5C

Opening the case and blowing a room fan over the innards prevents the freezing completely.

The video chip has a small heatsink already and Matrox says this should be enough. However, multiple threads in the Matrox troubleshooting forum have dealt with chip overheating.

Thanks in advance for your help.

[Arkaine23]

You may be able to attach a small fan with screws if the fins of the heatsink are spaced right. If not, a dab of silicone on four corners of the fan should hold it on there.

[Diggrr]

Here's what I did for my Matrox G450 dual head.

I covered the bottom of an old pentium heatsink (pin type) with some Kapton tape (clear amber electric tape) then set it on top of the video card with some white thermal goop. Worked fine, needed no fans.

An electric proof barrier is required because there are contacts on the top side of your card. A conformal coating would work to "contact proof" the card's top too, as long as there are no sharp solder points sticking up.

On another card I had, I just used a plastic covered wire to make a loop from one fan mount hole to another. This loop was used to hang the fan right from the edge of the card at an angle that blew it on the heatsink. I placed it on the end of the card towards the front of the case, and got some of the cool intake air this way.
You can use a piece of tape to secure it.

[gwallen4]

Good ideas. I didn't know if there was a more elaborate solution or whether I should just jerry-rig it.

Thanks