Each of these NAND chips hundreds of dies of flash stacked inside, and they are hooked up to the same data line, so just 1 of them can talk at the same time, and they still achieve >1GB/s bandwidth. If you could hook them up in parallel, you could have 100s of GBs of bandwidth per chip.
You could probably make special NAND chips where all of them can be active at the same time, which means you could get 100GB+ bandwidth out of a single chip.
This would be useless for data storage scenarios, but very useful when you have huge amounts of static data you need to read quickly.
And I was somehat conservative with the numbers, a modern budget SSD with a single NAND can do more than 5GB/s read speed.
And I was somehat conservative with the numbers, a modern budget SSD with a single NAND can do more than 5GB/s read speed.