fan on BPPC

[orange]

I'd like to attach a fan (70x70x15mm or maybe 50x50x10mm) onto PPC *heatsink* in A1200 desktop, because of heating..
I have no idea how to do it except using double-sided self adhesive tape (which I won't 'cause it should be replaced some day)
how should I proceed?

edit: mistake, fan is supposed to go on heatsink not chip

[Rob]

If you don't mind mutilating the heat sink you could take it off and drill and tap holes so you can screw the fan directly onto it.

Tap and die sets can be had for small money on ebay if you can't get hold of one locally so as long as you have a drill and a G clamp it shouldn't be a problem.

Make sure to cut the screws down to size of course.

[orange]

I'll think about it, thanks.

er, I considered using hot glue. It is a bit silly trying to use it on hot surface, but if the fan works as it should, there might be no problems, eh?
(I like hot glue since it is easily removable)

[Rob]

That sounds like a damm fine idea, especially if it works out.

[actung_bab]

what about using termal paste

[AmiJIm]

hi there,
the permedia 2 chipset sure does get really hot and eventually dies.
Have in mind that all permedia 2 chipset vga AGP and PCI cards made for the pcs,have a passive heatsink.I had to put a fan on to gain stability.
I also have a CyberVision PPC .Luckily ,the Cybervision PPC has 4 holes round the chipset for easy mecahnical support for the heatsink.Remember you need one with a fan.
On the bvision side,i sse the gap .
My personal advice is to avoid thermal paste/glue so to avoid any detach and burn the chipset.plase the heatsink/fan ,and use a plastic wrap belt to hold it in place.either bypass it at the hole in the middle,or from side to side.
take care,you have  a history ultra tech amiga RTG.

[orange]

um, thanks but you misunderstood me.
I have already placed a selfadhesive heatsink+fan  on bvision, thats not the problem (hopefully).
The thing is PPC chip already has heatsink, and placing another one on top of it tough in desktop A1200 because of space. So, I just want to use glue between original heatsink and fan (not on chip).
Unfortunately all thermal pastes that I could find here aren't "thermal glue". and it doesn't matter much in this case anyway because fan is made of plastic (poor heat conductor), not metal.

[amigagr]

my probleme looks like worst (foto) and so far i didn't find any solution...

[orange]

amije, you can buy on ebay dublesided selfadhesive thermal tape. its not cheap, and it might be difficult to get exact size you need. (I think its ok if its a bit smaller)
if you don't mind using new heatsink, you can look for chipset coolers  with adhesive, such as this one, again not cheap.. but I think solving this problem is worth the money.

of course, first clean both chip and heatslink with isopropyl or something.

[amigagr]

i have try some vga heatsinks but the don't feet well and i'm afraid that the doublesided tape it's not enough to hold it tight and safe.

[AmiJIm]

oh,i was in the wrong path...
i though bvison PPC.
well the power pc cpu does need a heatsink.Dont mess with the self adhensive pads.

To the solution now.
is the original fan working?It should be enough.
use some oil on the rotor.it should ease the motion and flow air easier/more.
If it is OK and still inadequet,then
i would put a laptop heatsink.I see there are 4 holes around the cpu,so keeping it in place would be easy.

you only have to find a suitable design.
you may have to unscrew and rescrew the fan according to blow or suck the air.
but the theory behind this design is.
take air above and under the fan ,and blow it to in a 90o angle directly on the heatsink.

AmiJe@
consider also.

look at the above.
http://cgi.ebay.com/MINT-Toshiba-Tecra-M3-Laptop-PC-Heatsink-Fan-Kit_W0QQitemZ180229542593QQihZ008QQcategoryZ177QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://cgi.ebay.com/Compaq-M2000-Laptop-AMD-Heatsink-Fan-3ICT9TATP01_W0QQitemZ360038606939QQihZ023QQcategoryZ80149QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://cgi.ebay.com/Dell-Laptop-Inspiron-1150-5150-5100-CPU-fan-Heat-sink_W0QQitemZ380012234495QQihZ025QQcategoryZ158886QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

[cv643d]

Wonder how effective a fan would be on the BPPC heatsink since the surface is flat.

It is not so easy to just replace the heatsink and put proper mini heatsink/fan on the PPC chip coz chips around it needs airflow. However depending on how you mount it (desktop/tower) you can probably find a custom solution.

I would just use a homemade mix of arctic silver with arctic silver glue (so you can easely remove heatsink in the future) and attach a 40mm heatsink/fan on top of the black heatsink.

[Framiga]

"Wonder how effective a fan would be on the BPPC heatsink since the surface is flat."

very low indeed! i have seen around custom solutions for BPPC (like separated heatsinks/fan for the PPC-68K and probably even the voltage regulators) but requires some work.

 

[orange]

I thought about it, too. It shouldn't be that low for a reasonably sized fan. Still, the problem is that hot air has no way of getting out.
Also, the new fan will be blowing against the original small one, if I'm not mistaken.
But, what the heck I'm gonna try it anyway.
The best solution would probably be replacing original one, but since this is in desktop a1200, that is not an option.

[Framiga]

or try something along this lines

http://www.amiga.org/gallery/index.php?n=962

which is not completely correct but ... x56h34 seems happy!