410
TSMC is apparently considering getting into the RAM business at the request of Nvidia.
(www.theverge.com)
This is a most excellent place for technology news and articles.
Oddly it does say "adding memory back into its portfolio" which implies that they used to do memory, so they might have mothballed facilities.
It's still a mammoth undertaking though.
Also, if they're already producing on-die DRAM for SoC's then perhaps that's their entry point.