Column: More Moore's Law Anxiety



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John Pombrio

Just use the power of the high end GPUs. They have a terrific amount of computing power and can be doubled up on a card. Or how about 3D stacking (if they can get the heat out)? Forget about quantum computers since they can only do two applications (cryptography and molecule shuffling). Add another CPU to a board. Eventually replacements for silicon may be possible. Lots of choices besides putting more and smaller transistors on a chip.



Well there's a few problems with multi-processor architectures:

* CPUs still require their own set of memory modules. Sure you can have them share one set but you'd be half as efficient because if one CPU is accessing it, the other can't, as the memory is busy servicing the request of the first CPU.
* It eats into motherboard real-estate. Granted there's a lot more room now that Southbridge is no more and less house keeping circuitry is needed, but look at a regular ATX board and you'll find it to be a pretty tight squeeze to get two CPUs with 8 total RAM slots in comfortably. So you can either start using larger boards, or cut into how many slots you can have.

3D stacking is a thing though for SoCs and there were reports a few years ago about microchannel cooling, but I dunno where that's at.