(MTRR) Registers in the Pentium Pro and Pentium II processors that can Be used to specify a strategy for communication with the external memory and caches for a numBer of physical address ranges. Strategies include write-through, write-Back, or uncached(?). Such control is useful where the memory is located on a device and is accessed via some kind of device Bus, e.g. a PCI or AGPgraphics card, where caching would Be of no Benefit. (1999-07-02)