Efficiency through complexity

Evolution Beyond Speed:
Aside from higher clock speeds microprocessors have evolved for increased complexity, using the “transistor budget” from Moore’s Law to add efficiency-boosting features like on-chip memory (Cache) and specialized circuits long before the “Power Wall” was hit.

The Power Wall & Multi-core Shift:
Around 2005, physical limits forced a pivot away from raw frequency increases toward multi-core architectures, meaning single-thread performance could no longer be the sole driver of speed.

The Software Consequence:
This shift meant that software could no longer automatically run faster on new chips; instead, programs had to be redesigned to leverage concurrency to unlock the full potential of modern hardware.