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The RAM shortage is coming for everything you care about
(www.theverge.com)
This is a most excellent place for technology news and articles.
HBM are thinned die stacks which are assembled at the GPU periphery using silicon interposers. My AMD GPU has HBM. In case of HBM overproduction post-bubble we might see resurgence of GPUs with HBM rather than GDDRx.