https://www.techpowerup.com/264192/cloudflare-deploys-amd-epyc-processors-across-its-latest-gen-x-servers The ubiquitous DDoS-mitigation and CDN provider, Cloudflare, announced that its latest Gen X servers implement AMD EPYC processors ditching Intel Xeons with its older Gen 9 servers. Cloudflare uses multi-functional servers (just like Google), in which each server is capable of handling any kind of the company's workloads (DDoS mitigation, content delivery, DNS, web-security, etc.). The company minimizes server hardware configurations so they're easier to maintain and lower TCO. The hardware specs of its servers are periodically updated and classified by "generations."
Cloudflare's Gen X server is configured with a single-socket 2nd gen AMD EPYC 7642 processor (48-core/96-thread, 256 MB L3 cache), and 256 GB of octa-channel DDR4-2933 memory, along with NVMe flash-based primary storage. "We selected the AMD EPYC 7642 processor in a single-socket configuration for Gen X. This CPU has 48-cores (96 threads), a base clock speed of 2.4 GHz, and an L3 cache of 256 MB. While the rated power (225 W) may seem high, it is lower than the combined TDP in our Gen 9 servers and we preferred the performance of this CPU over lower power variants. Despite AMD offering a higher core count option with 64-cores, the performance gains for our software stack and usage weren't compelling enough," Cloudflare writes in its blog post announcing Gen X. The new servers will go online in the coming weeks.
Personally it sounds like Cloudflare decided that EPYC uses less power overall. In a business with multiple servers that saves money.