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Re:Next-Generation IBM POWER10 Processor by rbanffy on Monday August 17, 2020 @02:24PM (#24190153)
IIRC, the new memory connection they introduced with the latest POWER9 chips traded bandwidth and physical distance for a bit of latency.
Re:Next-Generation IBM POWER10 Processor by jabl on Tuesday August 18, 2020 @04:03AM (#24196279)
Slides posted earlier in this thread say the OMI (the memory interface) adds about 10ns compared to straight DDR5.