Mind blown.Too much engineering required for it to be worthwhile.
There was a motherboard which was more recent than shared sockets which let you plug in an additional semi daughterboard with support for AMD rather than Intel (or the other way round).
http://hexus.net/tech/news/mainboard/1036-cebit-2005-amd-intel-same-motherboard/
As you can see, you need the socket, plus RAM and chipset in order for it to work because of the way memory routes to the CPU.
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