3 level cache is nothing new, several non-x86 designs employed a 3 level cache hierachy, the first 3 level cache x86 CPU was produced by Intel, http://www.dailytech.com/16MB+of+L3+...rticle2564.htm didn't help much it was still craptastic netburst.
First on-die L3 Perhaps Many Processors before utilised off chip L3 caches
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