Recently, the well - known engineer Jeff Geerling took advantage of the new capabilities in macOS 26.2 to link up four M3 Ultra Mac Studios, forming an AI computing cluster that boasts a whopping 1.5TB of unified memory. The linchpin of this remarkable accomplishment is the RDMA over Thunderbolt 5 feature introduced in macOS 26.2. This innovative functionality enables one Mac to directly tap into the memory of another Mac via the Thunderbolt 5 interface, bypassing the need for CPU involvement. As a result, it dramatically boosts the speed of memory access and enhances the overall efficiency of AI computing. In the Geekbench 6 multi - core test, this cluster outshone its rivals. It delivered a double - precision floating - point performance that surpassed 1TFLOPS, while keeping the idle power consumption below 10W. When it came to AI inference tests, the cluster also shone brightly, especially in handling large - scale AI models.