Two 256GB Mac Studios beat one 512GB for local LLMs: 2.2TB/s effective bandwidth
lxfater · x · 2026-10-31
Weighing one 512GB vs two 256GB M5 Ultra Mac Studios (172,999 CNY each in China, only 499 CNY more for two), the author picks two machines: connected via a single Thunderbolt 5 cable, RDMA cuts transfer overhead and enables tensor parallelism, stacking effective bandwidth to 2.2TB/s. Real-world results: GLM-5.3 generation jumps from 40 to 70 tok/s, DeepSeek V4.1 Flash from 60 to 100 tok/s. A practical sizing guide for local LLM deployment.
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