Older systems used a memory matrix. You had to install cards of a certain capacity and chip arrangement in a set order for it to work.
EDIT: This is an interesting read for that board. Scroll down to the memory section. They do use a memory matrix.
http://dlcdnet.asus.com/pub/ASUS/mb/socket775/P5K_SE/e3202_p5k-se.pdf
EDIT: This is an interesting read for that board. Scroll down to the memory section. They do use a memory matrix.
http://dlcdnet.asus.com/pub/ASUS/mb/socket775/P5K_SE/e3202_p5k-se.pdf
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