Apple M5 Ultra Benchmark Leak: Split Memory Controllers Deliver 1.2 TB/s Bandwidth

Leaked architectural validation sheets emerging from foundry testing in Hsinchu indicate that Apple next-generation flagship desktop processor, the M5 Ultra, implements a radical shift in memory controller topology. Rather than continuing single-layer monolithic memory rings, Apple has adopted a 2.5D dual-sided interposer.

At 1.228 TB/s of verified memory throughput, the M5 Ultra effectively doubles the memory transfer rates of the M2 Ultra and matches dedicated server accelerators. For engineers running local quantized weights, this enables full 70-billion parameter models to generate tokens at over 28 tokens per second without PCIe bus bottlenecking.