Meta Builds a Chip to Reuse Old Server Memory in New Servers
Meta's Vistara chip turns a hardware incompatibility problem into a cost-saving production tool, with measurable performance gains already in deployment.
Reporting from 1 source: GIGAZINE.
Meta announced a custom ASIC called Vistara that uses the CXL interconnect to connect old DDR4 memory to new DDR5 servers. The chip addresses a common data center problem where usable memory is scrapped when servers are retired. Meta is already running Vistara in production, reporting a 25 percent reduction in server count for ML inference and a 29 percent reduction in query time for a cache workload.
Meta presented the Vistara chip at the ISCA 2026 conference in late June. The chip is a custom ASIC that uses the CXL interconnect to attach old DDR4 memory to servers built for DDR5, solving a mismatch that normally forces operators to scrap usable memory when retiring servers after three to five years. Meta reports that about 44 percent of its general-purpose CPU servers are limited by memory capacity, and that DRAM can last seven to ten years, longer than the server body. The company is already running Vistara-based systems in production for recommendation inference, distributed cache, and large-scale data processing, and says it cut the number of servers needed for ML parameter serving by up to 25 percent and reduced average query time in one cache workload by 29 percent.
Synthesized by Yomimono from the 1 cited source below, including Japanese-language reporting where cited, then editorially reviewed before publishing.