POWER4
Microprocessor
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The POWER4 is a microprocessor developed by International Business Machines that implemented the 64-bit PowerPC and PowerPC AS instruction set architectures. Wikipedia
L1 cache: 64+32 kB/core
L2 cache: 1.41 MB/chip
L3 cache: 32 MB off chip
Max. CPU clock rate: 1.1 GHz to 1.9 GHz