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 Post subject: making or adapting a passive CPU heatsink
PostPosted: Thu Aug 18, 2011 3:35 pm 

Joined: Thu Aug 18, 2011 2:37 pm
Posts: 1
hello! newbie alert!

i have just bought a cheap factory-refurb Fujitsu D2703 mini-ITX board from (photo below)


The board is based on the AMD 690T chipset and is supplied without a CPU, but is intended for passively-cooled AMD Socket S1 processors.[1]

The recommended CPU for this mini-ITX board is the 1GHz Sempron 2100+ (fanless) which has a TDP of ~8 watts. The 2100+ processor is no longer available although I could probably source one secondhand from a salvaged laptop.

Alternatively, I could try an Athlon 64 TF-20 which is clocked at 1600MHz and has a TDP of ~15 watts[3], or maybe even a lowest-spec dual core Athlon 64 X2, e.g. the TK-42 clocked at 1600MHz with a TDP of ~20 watts.[4]

To try and keep the core temperature down, I would underclock and undervolt the CPU, and if possible, the passive cooling would be souped up with a high quality heatsink and heat pipe arrangement.

Now here's the rub.. Socket S1 boards were used predominantly in laptops, and in specialist miniITX boards. Consequently the Socket S1 board layouts and designs vary widely, and the board mounting points for the socket S1 heatsink are not standardised.

Worse still, when I came to buy a heatsink for this Fujitsu mainboard, I suddenly discovered why the boards are being sold off cheap on ebay... There is no heatsink available!!

Fujitsu don't sell the heatsinks any more. Coolermaster used to make their own heatsink for the board and with heatpipes too[5] (see photo below). But today noone is selling a heatsink, not passive, not active, for the Fujitsu D2703 miniITX Socket S1 boards.


So, with no compatible heatsink available for purchase, I've got a few choices..

I can either throw away the board, or put it back for sale on ebay (with or without a caveat about the heatsink), or I could try and fabricate a heatsink or, more practically, I could adapt an existing heatsink for a more common CPU socket type.

So can I pick the expertise of you experts and ask what I should do and moreover what should I not do here, please?!

I don't even know what the correct heatsink for this motherboard looks like.

Does the CPU need a standoff or a frame around to stop the heatsink straining the board and its components?

I have the AMD physical specifications for Socket S1. The diagram below is taken from the Socket S1 specs..[6]


I could easily measure the heatsink mounting holes on the motherboard and make a paper template. But what would I do with it? Is there a universal heatsink that could be adapted?

Has anyone done this before? Any advice welcomed!


[1] ... 0-muli.pdf
[2] ... X3DQE.html
[3] ... AX4DN.html
[4] ... AX5DM.html

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