M5 Ultra vs M3 Ultra: Real-World Local AI and Developer Benchmark Test

The M5 Ultra Mac Studio is tested side by side with the M3 Ultra to verify whether Apple's claimed performance gains hold up in real use. Storage speed, CPU compilation, memory bandwidth, and local LLM performance are measured on identical builds and model files.

■ CPU & Storage Benchmarks
- Speedometer, .NET compilation, and Python Mandelbrot tests across both machines
- Sequential and random disk read/write measurements, plus STREAM and GPU-side memory bandwidth tests

■ Local LLM Performance
- Prompt processing and token generation comparisons using llama.cpp and MLX
- Testing across MoE and dense models of varying sizes, including long-context prompts
- Evaluation of short-prompt scaling, power consumption, thermals, and fan noise

■ Configuration & Context
- Specs and pricing of the reviewed M5 Ultra configuration
- Coverage of the upcoming 512 GB model and planned follow-up testing

This video is aimed at developers and AI enthusiasts considering a high-end Mac Studio. It helps viewers understand what kind of real-world speedup to expect from the M5 Ultra and which workloads benefit most before making a purchase decision.