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We didn't go with the 64-core chips because they have significantly lower clock speeds.

Dual 32-core chips give us plenty of cores while keeping clocks higher for single-threaded performance.

You are correct that the price of the CPUs is almost irrelevant to the overall cost of a system with this much memory and storage. We were picking the ideal CPU, not selecting on CPU price.

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Thanks for the answer. I would have guessed that the higher core count outweighs the lower frequence for database usage, but obviously I don't know the details. I think the 90% CPU usage graph just made me nervous enough to want the biggest possible CPU in there.

ooi how is the NUMA on that setup? Does it still use QPI or is there a newer technology now (I've been out of this space for a few years now)

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