AMD Geode LX 900
The AMD Geode LX is a x86 CPU for embedded systems and thin clients. They have a very low TDP (5.1W for this model) with integrated graphics. The Geode LX is the successor of the Geode GX that was based on the MediaGX core made by Cyrix.
I don't have a way to benchmark this CPU but performance will be very low. I guess it would be in the ballpark of a 600MHz 486-class CPU.
The Geode GX and Geode LX should not be compared with the Geode NX. The latter is based on AMD's own Thoroughbred core and thus performs very well.