苹果M7 Ultra芯片或支持1.5TB统一内存

Apple is reportedly building an M7 Ultra chip that supports up to 1.5TB of unified memory.

That would more than double the memory ceiling on today's M3 Ultra Macs. The push comes from local AI, where large models need vast memory to run.

The big deal is that M7 Ultra’s GPU could access the entire 1.5TB pool directly. Unlike desktop DIMMs, Apple’s unified memory is package-integrated and fixed when owners purchase it.

An Nvidia Blackwell B200 server GPU carries 180GB HBM3e and reaches roughly 8TB/s bandwidth. 8 B200 GPUs together provide 1.44TB, so if M7 Ultra really happens then it will make it genuinely server-scale.

Unified memory lets the CPU, GPU, and Neural Engine share one fast pool. So data moves with lower latency and less power than split PC memory. i.e. Apple’s memory would serve CPU and GPU together, unlike NVIDIA’s dedicated GPU-only HBM.

Apple’s shared pool reduces copying between processors and gives the GPU far more capacity.

Apple's M3 Ultra already reaches 819GB/s of memory bandwidth by fusing two Max dies.

Bigger memory would let you run larger models and datasets entirely on-device.

That pulls Apple's top Macs into enterprise workstation and AI server territory.

It moves closer to dedicated accelerators like Nvidia's Blackwell, without claiming parity.

The catch is supply, because DRAM prices are climbing and parts stay scarce.

Apple already pulled its 128GB Mac Studio this year amid those shortages. An a 1.5TB part would need far more of that same costly memory.

Apple has not confirmed the M7 Ultra, so its final specs could change.

Memory supply, not chip design, decides whether this ships at a sane price.

If DRAM stays scarce, only film studios and labs could afford a 1.5TB Mac.

For some comparsion, an Nvidia RTX 5090 carries 32GB VRAM, but delivers 1.792TB/s bandwidth for graphics workloads.

M3 Ultra reaches 819GB/s, so Apple currently offers more capacity but less bandwidth.

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