Meta Builds DDR4-DDR5 Mixed Servers Using CXL 2.0

Meta has introduced a custom CXL 2.0 (Compute Express Link) controller to address the problem of surging hardware costs. This technology enables existing DDR4-2400 memory to be used alongside the latest DDR5-6400-based server systems.

The key points of this approach are as follows:

• Cost Efficiency: By reusing legacy DDR4 memory that has reached its replacement cycle in large-scale data centers instead of discarding it, capital expenditure (CAPEX) is significantly reduced.
• Memory Scalability: Leveraging the CXL interface to flexibly expand the system's memory capacity and mediate communication between heterogeneous memory specifications.
• Infrastructure Optimization: Economically securing the memory pool needed for large-scale AI model training and inference while maintaining the performance of the latest high-performance processors.