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Cloudflare

|Architecture

Inside Gen 13: how we built our most powerful server yet

2026-03-23

18 min read

by Syona Sarma

Tags:

Hardware

Infrastructure

Engineering

AMD

Cloudflare details the engineering decisions behind Gen 13, their most powerful server featuring AMD EPYC Turin 9965 with 192 cores.

•AMD Turin 9965 chosen over 9755 and 9845 for highest aggregate throughput and best performance-per-watt at 500W TDP
•FL2 (Rust-based request handling rewrite) reduced L3 cache dependency, enabling shift from 12 MB/core to 2 MB/core
•768 GB DDR5-6400 memory (12x 64 GB, 1DPC) maintains 4 GB/core ratio with 614 GB/s peak bandwidth
•Network upgraded from dual 25 GbE to dual 100 GbE, providing 4x bandwidth increase
•Delivers up to 2x throughput and 50% better performance/watt vs Gen 12

This summary was automatically generated by AI based on the original article and may not be fully accurate.

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