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Meta Unveils Vistara ASIC to Blend DDR4 into DDR5 Servers

7/3/2026

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Summary

Story summary

Meta launched the Vistara CXL ASIC to let legacy DDR4 DIMMs operate in its DDR5-only servers.
Vistara connects DDR4 via a CXL 2.0/1.1 PCIe Gen5 x16 link, enabling reuse with little performance loss.
Each MemServer pairs 768 GB DDR5-6400 with 256 GB DDR4-2400, and Meta says the slower DDR4 tier’s limited bandwidth and higher latency minimally affect overall performance while preventing out-of-memory events and cutting infrastructure costs.

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Story summary

Meta launched the Vistara CXL ASIC to let legacy DDR4 DIMMs operate in its DDR5-only servers.
Vistara connects DDR4 via a CXL 2.0/1.1 PCIe Gen5 x16 link, enabling reuse with little performance loss.
Each MemServer pairs 768 GB DDR5-6400 with 256 GB DDR4-2400, and Meta says the slower DDR4 tier’s limited bandwidth and higher latency minimally affect overall performance while preventing out-of-memory events and cutting infrastructure costs.