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Photons vs. KV Cache: PRISM Slashes LLM Memory Traffic 16x, But Silicon Valley's Been Here Before

Forget faster ALUs. The KV cache memory wall was strangling long-context LLMs. PRISM blasts it with photons — 16x less traffic, O(1) selection. Skeptical? So am I.

theAIcatchup Apr 07, 2026 4 min read
PRISM photonic circuit selecting KV cache blocks with light wavelengths

⚡ Key Takeaways

  • KV cache memory bandwidth, not compute, bottlenecks long-context LLMs. 𝕏
  • PRISM's photonic selection achieves O(1) block picking, 16x traffic reduction. 𝕏
  • Photonics revives old hype; scaling to production remains the real test. 𝕏
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#PRISM #photonic computing

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Originally reported by dev.to

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