1

I'm curious if my 2 DIMMs are running dual-channel or not and use:

dmidecode -t 17

...
Type Detail: Synchronous
...

What does a "Synchronous" type detail mean? Dual-channel?

2

It means that the RAM sticks are driven by a clock signal — as opposed to (older) asynchronous DRAMs. See the Wikipedia page on SDRAMs.

To find out whether your RAM is dual-channel, look for “Interleaved Data Depth” in dmidecode output. It should say 1 for single and 2 for dual channel RAM.

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