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Proposed using a long fiber loop as an L2 cache to hold AI model weights for near-zero latency and gigantic bandwidth.
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John Carmack Muses Using a Long Fiber Line as an L2 Cache for Streaming AI Data — Programmer Imagines Fiber as Alternative to DRAM
Tom's HardwareanalysisneutralFeb 10, 2026
John Carmack proposes using long-distance fiber optic loops as an L2 cache for AI model weights, offering potential power efficiency advantages over DRAM while maintaining gigantic bandwidth and near-zero latency.
“Proposed using a long fiber loop as an L2 cache to hold AI model weights for near-zero latency and gigantic bandwidth.”
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