Fans for 68040 processors

[ArmorAlley]

Hi all,

 Do ye have any recommendations for fans/active heatsinks for 68040 processors?

Both are possibilities for my Performa 475.

There are two processors that I'm thinking about.

The first is for a 40MHz 68040 overclocked to 50MHz. It is a part of the NewerTech Quadra Overdrive.

It comes with its own active heatsink but it just out so much that it blocks the PDS network card.

Alternatively, if anyone knows of a PDS network that is thinner than usual, that would also do the trick. They all seem to be a standard shape.

The second is for a full 25MHz 68040 to replace the 68LC040.

Although a passive heatsink would probably suffice, I would like to what other options there are.

Many thanks

aa

 

[Byrd]

Best option would be a HSF for a 486 - they are always low profile and can be easily adhered to the '040 with thermal adhesive.  A passive heatsink is all you need for a 25Mhz full '040 part - it doesn't get that hot.

 

[ArmorAlley]

Thank you very much for this. I shall go look.

 

[Byrd]

Another option I was thinking of is those small footprint low-profile HSFs found on low-end graphics cards (eg. Geforce 2/3+, Radeon 8500+) - you could probably search eBay for an AGP graphics card and get something very cheaply.

 

[johnklos]

I've posted this before - I've had great success using various heat sinks with heat sink epoxy (where you mix two parts and it hardens over time). Here's a picture where you can see some of the heat sink epoxy between the CPU (on a QuadDoubler) and the heat sink. The epoxy works just as well with copper heat sinks.

 

[MJ313]

Hey johnklos- what brand epoxy do you use? Any specific recommendations? I was looking at some AS stuff, but then it said not for use between CPU and heatsink...

Any info would be helpful--

 

[Byrd]

Adhesive thermal paste is pretty hard to obtain - it's usually just white goop, nothing special but more than suitable for lowly '040 CPUs.  It also usually doesn't last and the tube dries out after a few weeks do don't buy much.

Previously (but not now) I've been known to apply a thin layer of normal thermal paste on the CPU, wipe off a small portion on two corners on the CPU, and put a tiny dot of superglue on the corners.  Heatsink holds well.

 

[johnklos]

I use this:

http://www.newegg.com/Product/Product.aspx?Item=N82E16835100005

It's about $13, which is expensive, and yes, you don't want to try to keep the tubes around for long, so I try to buy that and do as many things as possible all at once. My last purchase did five m68040s and I still had some left.

BTW - it's 100% fine for m68040 CPUs. The no CPU thing is about modern Intel and AMD systems. If you use it on one of those, there's no way to ever remove the CPU since you can't open the CPU socket cage.