Do you mean the comment under the article that mentions HBM? If so I think they refer to these papers by AMD: https://www.computermachines.org/joe/publications

Do you mean the comment under the article that mentions HBM? If so I think they refer to these papers by AMD: https://www.computermachines.org/joe/publications/pdfs/hpca2017_exascale_apu.pdf https://www.computermachines.org/joe/publications/pdfs/hpca2... https://seal.ece.ucsb.edu/sites/seal.ece.ucsb.edu/files/publications/2017-iccad-stow-activepassiveinterposers.pdf https://seal.ece.ucsb.edu/sites/seal.ece.ucsb.edu/files/publ...