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Questions about this product? Free pre-sales support from a senior specialist — product questions, compatibility checks, BOM quotes, price confirmation — typically answered within one business day. Need camera placement or system design work? Engineering time is $175 per hour (qty 1 = 1 hour). Hardware buyers get up to one hour ($175) credited back on their order.
The Lenovo 4X77A99751 is a 16GB single-rank DDR5 ECC UDIMM running at PC5-5600 (5600 MT/s), designed for Lenovo ThinkSystem servers that require error-correcting memory in density-conscious 1U and 2U deployments. ECC catches and corrects single-bit memory errors in real time — critical for always-on workloads like surveillance recording servers, database nodes, and virtualization hosts where a silent memory fault would corrupt data or crash the OS. The 1Rx8 (single-rank, ×8 organization) configuration delivers the full 5600 MT/s rated speed on compatible platforms, making it the right choice when you need speed without the latency penalty sometimes seen on dual-rank modules at high clock rates. If you are populating a ThinkSystem server and need to confirm slot count or mixing rules before ordering, match the 4X77A99751 against your server's memory configuration guide.
This module is engineered for Lenovo ThinkSystem servers that explicitly support PC5-5600 DDR5 ECC UDIMM memory — including platforms built on Intel Sapphire Rapids and later Xeon Scalable processor generations. Confirm compatibility against the Lenovo ServerProven list for your specific ThinkSystem model (e.g., SR630 V3, SR650 V3, ST650 V3) before installing. DDR5 UDIMMs are not backward-compatible with DDR4 slots; mixing generations is not supported. Single-rank modules may be required or preferred for maximum-speed operation in certain slot configurations — consult your server's memory population rules to determine whether 1Rx8 or 2Rx8 is optimal for your channel count and capacity target.
Follow Lenovo's memory population sequence for your specific ThinkSystem model — incorrect slot ordering can reduce operating frequency or prevent POST. DDR5 UDIMMs require on-module power management ICs (PMICs); handle with standard ESD precautions. On first boot after installation, verify the module is recognized at the rated 5600 MT/s speed in the UEFI/BIOS memory configuration screen — some platforms default to a lower JEDEC speed until XMP/EXPO or platform-specific SPD profiles are applied.
Manufacturer-verified compatible cameras, recorders, mounts, accessories, and licenses for this product. Adjust quantities and add the entire bundle to your cart in one click.
16GB TruDDR5 4800 MHz 1Rx8 ECC UDIMM designed for Lenovo ThinkSystem servers — the right module when you need validated, error-correcting memory that
32GB TruDDR5 4800 MHz 2Rx8 ECC UDIMM designed for Lenovo ThinkSystem servers where memory capacity, speed, and data integrity are non-negotiable
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