Why can’t you buy external ram that plugs into a usb like you can for an ssd?
In: Engineering
You can, kind of.
[https://en.wikipedia.org/wiki/ReadyBoost](https://en.wikipedia.org/wiki/ReadyBoost)
But it’s massively limited in the data throughput. DDR4 RAM has a throughput of up to 25 GB/s. USB 3.0 comes in at a paltry 625MB/s, less than 1/40th of the speed. USB can’t even compare with the first version of DDR RAM from 20 years ago, which was still 1600MB/s.
It’s analogous to attempting to route a river through your kitchen faucet. There just isn’t enough space.
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