Unverified50% confidenceTradeoffExact time
If the GPU is already a bottleneck at the 256GB configuration, doubling the memory to 512GB will not improve GPU compute, and loading larger models will instead result in slower inference.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
9/25/2026
First Seen
Valid until: 12/24/2026
Sources
Related Entities
Related Claims
UnverifiedThe user found that the M5 Ultra's GPU compute power is insufficient relative to its large 256GB memory capacity.79% similarUnverified自回归推理是memory-bound（内存带宽受限）问题，因为batch size通常为1时算术强度极低，GPU大部分时间在等待数据搬运78% similarUnverifiedLoRA fine-tuning reduces the required GPU memory from hundreds of GB to the GB level.77% similar
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