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PAT mode is supported only when the system uses DDR400 with 800Mhz FSB CPU. PAT performs data transactions directly from the CPU to the system memory, bypassing the normal path of operation. This reduces the MCH timing therefore providing improved system performance.
Since the two Northbridges are so similar some companies like Abit and Asus have released BIOS patches that enabled PAT like performance boosts to the slower i865PE. Of course Intel wasn't very happy about this so we can probably expect this form of overclocking will be disabled in the future.
800-/533-MHz System Bus
Intel Hyper-Threading Technology Support
Intel Performance Acceleration Technology (PAT)
478-pin Processor Package Compatibility
Intel Hub Architecture
Dual-Channel DDR 400/333 SDRAM Memory with ECC Support
Integrated Hi-Speed USB 2.0
Dual Independent Serial ATA Controllers
Integrated Intel RAID Technology
AC '97 Controller
Intel Communication Streaming Architecture (GigaLan Port)