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Individual modules may usually be powers of two, but a machine can make use of multiple mismatched modules. 64+16+4+4+2=90
I do still think that AI overview answer is bogus, but it's not impossible.
EDIT: Now that I think of it, I have definitely seen individual consumer DIMMs in 24, 48, or 96 GB. So, not always just powers of two.
It used to be all powers of 2, but kinda starting around DDR5 they started appearing in a sort of "sub power of 2", so it'll be two different powers of 2 added together - typically one step away from each other. So you'll get like 16+8 (24) or 32+16 (48) or 64+32 (96)
Both very good points.
Counter point to the mismatched modules point (I'm currently running 24GB in my own rig, so I did think of that possibility): I am pretty confident that there aren't any cars running around with 5 ram slots. You could just sum the two 4 sticks to one 8 stick and throw it in a common dual channel four slot board, but then you're mixing capacities on each channel, which either causes issues or just doesn't work (it's been a minute since I've done it). Also, from a manufacturing standpoint, having to install/manage four completely different items doesn't scale as easily as just having one. In the volume that they're buying, I'd bet that the cost savings from using smaller sticks would be pretty minimized by the extra cost/complexity of setting up processes for multiple items.
I'm going to look into the weird DIMM sizes that you mentioned. I've never seen them, so it might just be a gap in knowledge on my part.
In a car they are only putting in what thay need. The ram is soldered in so it can't fall off when you hit a bump - that or complex/expensive fasteners.
I found this comment:
And that seems to be backed up under "subchannels" on the ddr5 Wikipedia page.
Neato, thanks for teaching me something new