533 strap forces PAT on 865, asus found it and everyone followed.
CPC 1T on 875 etc it 1T but rarely works. DDR2 has no option at this time for 1T on an Intel chipset.
If you study the registers for PAT you will see its the same at 533(865) as 800 on the 875, so all Intel did was overclock the chipset to force faster memory access.
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