21 Nov
1999
21 Nov
'99
10:52 p.m.
>> Since we are talking fluid cooling, anybody
putting a heatsink on both
>> sides of the chip?
>> I would not worry too much about the water side, pressure and flow can work
>> wonders there, but would keep the copper plate just thick enough to avoid
>> hot spots and cover as much of the chip surface as electrically possible.
>Well, sounds gut at first sight - just three
problems:
>First you have only a _very_ small free area on the 'other' side - there
>are some nasty pins, and somehor it is no-good to touch them.
>Ans second, this is hard to do in any standard board - and even
>with custom extenders you still have to connect them and the
>wire length becomes a problem - adding 10% corespeed and loosing
>20% bus speed isn't exactly a gain.
What I had in mind was a hole in the motherboard,
perhaps two (water
in/out), with a small plate making contact directly under the "chip". My
guess is that it could be substantly more effective given the internal
construction of most chips.
Well, take a look at any ordinary board, and you will notice that
the 'free' space below the CPU isn't free at all - 4 to 6 layers
of connections - and I just asume they may have some sense - also
the reachaple surface is _very small (less than 3cm^2).
I just see I forgot to mention problem number 3:
The bottom side has (AFAIK) never a usable (and thermal
relevant) connection to the chip itself. wouldn't it be
somewhat stupid to rely on thermal transport into a region
where under all normal circumstanses no or only a minimal
heatremovel is possible ?).
Servus
Hans
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Ich denke, also bin ich, also gut
HRK