For E1, it's because of less aggressive OoO for power saving, and a very aggressive power target of 180mW at 2.5GHz on 7nm. It's within 1.5x of Cortex-A55 perf

For E1, it's because of less aggressive OoO for power saving, and a very aggressive power target of 180mW at 2.5GHz on 7nm. It's within 1.5x of Cortex-A55 perf on single threaded workloads, and with efficiency as the mantra, SMT was worth it there. (but we'll see what happens in future designs... there's both the in-order Cortex-A5xx and the OoO Cortex-A6x which is Neoverse E for the power efficient role)