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Would be great if you could validate/test & showcase the SPARC T7-1 performance advantage over an IBM Power8 system with same # of cores like an E850 32-core or even Power E870 system. Ive seen sizings done by the Flexcube folks recently for a banking customer that shows that SPARC M7 @ 4.13GHz has superior performance/core than Power8 @ 4.19GHz!
You are not the first to ask for this. Nor will you be the last. I have been asking for access to IBM Power8 systems to tune and run FLEXCUBE workloads for years to publish comparisons. Especially given that I see the same anecdotal evidence you mention. I also have been pushing to publish relative sizing from the sizing team. If I get approval, I will author an article. Finally, if you know where we can get access to Power8 for a while to run the FLEXCUBE workloads, let me know offline, I'm sure I can find resources to setup, tune and run FLEXCUBE workloads against it.