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How do you offload the KV cache to CPU or NVMe, and when is it worth the bandwidth hit?

GPU memory runs out long before you run out of conversations to cache. Offloading KV to CPU or NVMe buys capacity, but the interconnect can become the new bottleneck. Here is the bandwidth math.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

GPU memory runs out long before you run out of conversations to cache. Offloading KV to CPU or NVMe buys capacity, but the interconnect can become the new bottleneck. Here is the bandwidth math.

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