> I don't know why the performance characteristics are so similar. I guess once you have a big fat memory subsystem on-die, everything else is diminishing retur

> I don't know why the performance characteristics are so similar. I guess once you have a big fat memory subsystem on-die, everything else is diminishing returns? The first-gen PRF design was built to have the throughput of the old one, while having much gentler design limits and lower power consumption. Haswell expanded the execution engine to 8-wide (4xALU, 2x load agu, 1x store agu, 1x store data), something the older design couldn't have done.