Where do the timings come from CHA CHB

Soldato
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14 Apr 2009
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Cheshire
Probably a silly question.

In the bios I have CHA and CHAB timings to the right of where I can set a value of either Auto or a number.

Where do the numbers from CHA and CHB come from? I'm pretty sure the primary ones have always been the same, read from SPD?, but the others do seem to have changed when I was messing bout with tuning and had a few failed boots.

Are they set based on RAM training?

Where I have a number (instead of Auto) they can be lower, or higher than the timings in the CHA and CHB columns.
 
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