En la web de Intel pone que el modelo 531 posee "Intel Extended Memory 64 Technology" (Intel EM64T), y los modelos que lo soportan son: 571, 561, 551, 541, 531,y 521.
Para el que se pregunte… ¿y qué es eso de Intel Extended Memory 64 Technology"?, bueno, pues también en la web de Intel he encontrado esto:
Intel® Extended Memory 64 TechnologyΦ (Intel® EM64T) enables 64-bit computing on the server/workstation and desktop platforms when combined with supporting software. Intel EM64T improves performance by allowing the system to address more than 4 GB of both virtual and physical memory. Intel EM64T provides support for:
64-bit flat virtual address space
64-bit pointers
64-bit wide general purpose registers
64-bit integer support
Up to 1 terabyte (TB) of platform address space
Salu2.