There are many motherboards supporting PC-2100.
PC-2100 is the same thing as DDR-266.
You should be able to run PC-2100 in a PC-2700/PC-3200 system; the motherboard chipset will run all memory at PC-2100; The memory bus will run at around 133MHz, which should be good enough for at least a 1.5GHz processing frequency.
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"Memory with lifetime warranty? So, whose lifetime is that?"
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