IBM Message Board - Msg: 16509860

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Technology Stocks : IBM

IBM 297.26

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3:59 PM EST

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To: Robert Scott Diver who wrote (7358)	10/16/2001 9:59:06 AM
From: Joseph Pareti	Read Replies (2) of 8218

can anybody comment on these 2 points (related to POWER4 for High Performance Computing) : - Linpack 1000: They score an impressive 2.894 GFlops per cpu. BUT... this benchmark allows almost any modification to the code, and in the last years cpus from several vendors where able to reach between 75% to 82% of the peak performance on this benchmark. Power4 attains only 55% of peak... Why is it so ? - IBM has released a special system, designed for HPC only: it has only 1 processor on a chip, instead of 2. It allows the Level3 cache and the memory bandwidth to be shared by 4 cpus instead of 8. Again, theoretical bandwidth should not be an issue (they quote 100 GB/sec to L2 cache).

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