http://stallman.org/stallman-computing.html
He mentions its a Lemote machine which doesn't look like it uses an AMD/Intel processor, as it uses Longsoon:
http://en.wikipedia.org/wiki/Loongson
"Unlike processors from Intel, Advanced Micro Devices or VIA Technologies, Loongson does not support the x86 instruction set. The processor's main operating system is Linux, while in theory any OS with MIPS support should also work."