How Much RAM Does the OpenMetal Medium v4 Need for TDX?

Q: How much RAM does the OpenMetal Medium v4 need to activate Intel TDX?

The OpenMetal Medium v4 requires 1 TB of RAM — all 16 DIMM slots populated with 64 GB modules — to activate Intel TDX.

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The requirement is not purely about capacity. The Intel Xeon Silver 4510 activates TDX only when all 8 DDR5 memory channels per socket are in use. The standard Medium v4 populates 4 channels per socket with 4 x 32 GB DIMMs (256 GB total). TDX cannot be enabled in this partial-population state regardless of total memory size — the channel count is the gating factor, not gigabytes alone.

Reaching 1 TB requires replacing those DIMMs with 8 x 64 GB modules per socket, filling all 16 slots across both sockets. This satisfies Intel’s channel-population requirement and activates TDX. It also raises aggregate memory bandwidth from approximately 282 GB/s to approximately 563 GB/s, since the additional active channels contribute directly to throughput. Intel SGX shares this same prerequisite and activates simultaneously.

The 1 TB figure comes from the maximum even distribution across all available channels: 8 channels x 64 GB (current maximum DIMM size for this platform) x 2 sockets = 1,024 GB. There is no intermediate RAM configuration that satisfies full channel population at a lower total capacity on this server.