Memory Type Range Registers
<architecture, video> (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
Strategies include write-through
, 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 AGP graphics card
, where caching would be of no benefit.