Does the presence of a HDD or SSD across the three architectures make a difference, or is this purely a CPU problem to be solved? I see the testing made sure to fit all tables in memory with a large enough innodb buffer pool, so was storage even a factor?
https://dynimize.com/blog/discussions/dynimizer-mysql-cross-...
It seems to me the only system with SSDs (Ivy Bridge) sees higher transactions per second improvement than the other systems.