why did my K8N-E Deluxe decide to set my ram to 133 instead of 200?

Jun 14, 2003
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i was jus goin in to the bios to turn FW off, and i notice my ram is running

133Mhz 2-3-3-6

everything is set to auto, no over clock. CPU FSB was still 200


everything has been running as it should since i built this rig, and now its automatically decided to down clock my memory (geil PC3200 1Gb) from 200 to 133

i manually set 200 2.5-4-4-8, it worked, just for kicks i put it back on auto and it picked 133 again
why would it just decide to do this out of the blue?

also can some one tell me or explain the diff between 1T and 2T command rate?