Apple M5 GPU: Diminishing Returns Emerge

Apple's M-series chips have consistently improved GPU performance, but recent generations, particularly the M5, are demonstrating diminishing returns from increased core counts. Architectural enhancements in the M3 generation, such as ray tracing accelerators and Dynamic Caching, aimed to boost traditional graphics. The M5 generation, launched in 2025, focused on generative AI with neural accelerators on each core, alongside refinements to ray tracing.

Testing indicates that while Apple's processors advance each generation, the performance gains are not uniform across the product line. Specifically, the M5 generation's GPU performance does not increase as consistently with higher core counts compared to the M4 series. For instance, doubling GPU cores in the M5 generation yielded a smaller performance multiplier than in the M4 generation.

Factors beyond core count, such as clock speed and memory bandwidth, also influence GPU performance. The M3 overhaul introduced ray tracing and mesh shaders, while the M5 integrated neural accelerators for AI tasks. However, the efficiency of adding more cores for performance gains appears to be decreasing with newer chips like the M5.