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Re:AMD Demonstrates Stacked 3D V-Cache Technology: 192 MB at... by jahnu on Tuesday June 01, 2021 @06:45AM (#27352685)
It says L1 here

"Both it and all levels of cache in the main processor from level 1 use eDRAM, instead of the traditionally used SRAM."

https://en.m.wikipedia.org/wiki/IBM_z15_(microprocessor)

Re:AMD Demonstrates Stacked 3D V-Cache Technology: 192 MB at... by baybal2 on Tuesday June 01, 2021 @06:55AM (#27352753)
Re:AMD Demonstrates Stacked 3D V-Cache Technology: 192 MB at... by jahnu on Tuesday June 01, 2021 @09:33AM (#27354160)
IBM's technical guide also says it's eDRAM

https://www.redbooks.ibm.com/redbooks/pdfs/sg248851.pdf

Re:AMD Demonstrates Stacked 3D V-Cache Technology: 192 MB at... by rbanffy on Tuesday June 01, 2021 @01:41PM (#27358356)
It's almost sad to see the x86s compared to the IBM mainframes...