Apple M5 Ultra

The M5 Ultra is the largest chip Apple has ever built and the first with four dies, made by joining two dual-die M5 Max chips over next-generation UltraFusion. That gives up to 80 GPU cores, each carrying its own Neural Accelerator, a 36-core CPU and a 32-core Neural Engine. For local model work the number that matters is not compute but memory: 512 GB of unified memory at 1.2 TB/s, which is more capacity than any single datacenter GPU on this site and roughly a quarter of the bandwidth of a top-end HBM part. That trade is the whole argument for a Mac Studio as an inference machine, since a model that will not fit on an 80 GB accelerator fits here comfortably and simply runs slower. Apple skipped the Ultra tier of the M4 generation altogether, so this is the first new Ultra since the M3 Ultra of March 2025, and Apple rates its GPU at up to 4.5x the peak AI compute of the M3 Ultra. Apple publishes no FLOPS figure, so the FP32 rate shown here is worked out from the core count and clock.