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Solve : double-sided DIMMs?

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When a DIMM has chips on both sides of the stick, do the pins on one side work independently or are they dependant on the pins on the other side?
Just wonderingIt depends.  From wikipedia:  DIMM

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Most DIMMs are BUILT using "x4" (by 4) memory chips or "x8" (by memory chips. "x4" or "x8" refer to the data width of the DRAM chips in bits.

In the case of the "x4" Registered DIMMs, the data width per side is 36 bits; therefore, the memory controller (which requires 72 bits) needs to address both sides at the same time to read or WRITE the data it needs. In this case, the two-sided module is single-ranked.

For "x8" Registered DIMMs, each side is 72 bits wide, so the memory controller only addresses one side at a time (the two-sided module is dual-ranked).
SIMM (single inline memory module) pins work the same on both sides, not individually.

DIMM (dual inline memory module) pins work individually on each side usually.

Here's a little reading for you to further explain the differences:
http://en.wikipedia.org/wiki/Simm
http://en.wikipedia.org/wiki/Dimm

And Dahlarbear BEAT me to the punch.


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