The Intel Performance Acceleration Technology (PAT) is technology built onto Intel i875 Canterwood mainboards and other Pentium 4 based motherboards that based on the Intel D875PBZ reference board. Performance Acceleration Technology delivers additional system-level performance by optimizing memory access between CPU and system memory, allowing increased performance to be exhibited at standard operating specification.
There are three types of Performance Mode: Disabled, Partially enabled, and fully Enabled. There may be BIOS settings that affect this parameter. The PAT status is reported by some versions of Memtest86 and CPU-Z, and at boot time by Dell motherboards.