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Yhn SportCricket first seen 13 h ago, last 1 min ago, peak #9

Using an iPhone as a second GPU speeds up local AI models

Original: I made my iPhone a second GPU for my MacBook-Qwen 3.8 27B prefills 29–44% faster

A developer reports hooking up an iPhone to a MacBook as an extra compute device, accelerating prefill times for the Qwen 3.8 27B AI model by 29-44%. The trick taps the phone's Apple Silicon GPU alongside the laptop's own, drawing interest from people running large language models locally on consumer hardware.

Why now: Running large AI models locally is a hot topic, and squeezing extra performance from existing Apple devices is a novel, practical hack.

AppleiPhoneMacBookQwen

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Rank over time, top of the chart is #1. 22 snapshots from 13 h ago to 1 min ago.

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