Mac Studio M4 Max Delivers 546 GB/s Bandwidth for Local AI

Apple’s new Mac Studio with the M4 Max chip delivers the memory bandwidth that local AI enthusiasts have been waiting for. The 128GB configuration offers 546 GB/s of throughput, which directly addresses the primary bottleneck for running large language models on desktop hardware. This setup allows users to load significantly larger models locally without relying on cloud services.

128GB unified memory configuration targets local LLM workloads

The system we tested features a 16-core M4 Max processor paired with a 40-core GPU. Apple configured this specific unit with 128GB of unified memory to maximize its utility for AI workloads. The processor combines 12 performance cores and 4 efficiency cores to handle complex computational tasks efficiently.

Mac Studio M4 Max Specifications

• CPU: M4 Max (16-core: 12 performance, 4 efficiency)
• GPU: 40-core GPU
• Memory: 128GB LPDDR5X
• Memory Bandwidth: 546 GB/s
• Memory Bus Width: 512-bit (inferred)

Memory bandwidth is the defining feature of this configuration, reaching 546 GB/s. This speed is double that of competing Nvidia GB10 and AMD Strix Halo chips in decode throughput tests. We can infer the chip uses LPDDR5X-8533 on a 512-bit bus to achieve this rate, though Apple does not confirm the exact memory type.

The Mac Studio includes four Thunderbolt 5 ports, two USB 3 ports, 10Gb Ethernet, and an HDMI 2.1 port. The 40-core GPU likely contains 5,120 execution units based on Apple’s current architecture. Apple does not disclose specific GPU clock speeds or peak FLOPS figures for this chip.

The M4 Max Mac Studio with 128GB of memory is priced at $8,499 USD. Buyers should expect a lead time of over two months for delivery in the US market. We have tracked Mac Studio pricing trends closely, including earlier coverage on the Apple Mac Studio M3 Ultra Price.

This configuration establishes a new baseline for high-memory local AI performance on Apple Silicon. The combination of massive bandwidth and high-capacity unified memory makes it a viable option for developers and researchers. It remains the most powerful standalone Mac Studio option available for these specific workloads.