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In fact, the largest POWER9 CPUs have up to 110MB of L3... and Zen 4's L3 apparently maxes out at 384MB(!!).

> Zen 4's L3 apparently maxes out at 384MB(!!).

That's with them holding back and not adding any v-cache. If you stacked an extra 64MB on each of the 12 compute dies, you'd have 1152MB.