Lenovo 4X77A85812 THINKSYSTEM 24GB TRUDDR5 4800MHZ (1RX8) RDIMM-A
Lenovo 4X77A85812 THINKSYSTEM 24GB TRUDDR5 4800MHZ (1RX8) RDIMM-A
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Overview

SKU: 4X77A85812
Condition: New
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Lenovo

Lenovo 4X77A85812 Thinksystem 24GB TRUDDR5 4800MHZ (1RX8) Rdimm-a

Lenovo 4X77A85812 24GB TruDDR5 4800MHz (1Rx8) RDIMM-AOverviewThe Lenovo 4X77A85812 is a 24GB TruDDR5 4800MHz (1Rx8) Registered DIMM-A module for Lenov…

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Lenovo 4X77A85812 Thinksystem 24GB TRUDDR5 4800MHZ (1RX8) Rdimm-a

$639.99
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Overview

SKU: 4X77A85812
Condition: New

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Description

Lenovo 4X77A85812 24GB TruDDR5 4800MHz (1Rx8) RDIMM-A

Overview

The Lenovo 4X77A85812 is a 24GB TruDDR5 4800MHz (1Rx8) Registered DIMM-A module for Lenovo ThinkSystem servers. The RDIMM-A designation identifies this as an Advanced module validated against Lenovo's memory qualification program — meaning it ships with Lenovo firmware compatibility pre-verified, which matters in dense multi-DIMM configurations where unvalidated third-party modules can trigger stability faults or force the platform into lower-speed fallback modes. At 24GB on a single-rank ×8 organization, this module fits scenarios where you need an odd-capacity slot fill — bridging between 16GB and 32GB tiers — without paying for capacity you won't use. The 4800MHz bus speed delivers meaningful bandwidth headroom for memory-bound workloads such as in-memory databases, virtualization hosts with large vSwap requirements, or AI inference at the edge.

Compatibility

This module is drawn from Lenovo's ThinkSystem TruDDR5 4800MHz RDIMM-A family. Based on the part numbering scheme (4X77A8xxxx series, RDIMM-A suffix), compatible platforms include ThinkSystem servers that support DDR5-4800 registered DIMMs with the RDIMM-A qualification tier. Sibling modules in the 4800MHz RDIMM-A family include the 4X77A81437 (16GB 1Rx8), 4X77A81440 (32GB 2Rx8), 4X77A81438 (32GB 1Rx4 10x4), 4X77A81441 (64GB 2Rx4 10x4), 4X77A81448 (96GB 2Rx4 10x4), and 4X77A81447 (48GB 2Rx8). Always verify your specific ThinkSystem server's Hardware Maintenance Manual or Lenovo ServerProven compatibility list before ordering — not all RDIMM-A modules are interchangeable across every Gen 4/Gen 5 ThinkSystem platform, and mixing RDIMM and RDIMM-A modules in the same server is not supported.

Installation Notes

Install into DDR5-compatible DIMM slots only. Follow the population order specified in your server's service manual — ThinkSystem platforms enforce strict DIMM slot sequencing to achieve rated speed; out-of-order population typically drops the platform to a lower memory speed tier. Do not mix RDIMM-A modules with standard RDIMM or ECC UDIMM modules in the same system. After installation, verify the module is detected at full 4800MHz speed in the UEFI memory configuration screen before returning the system to production.

Expert Analysis
Specifications
Weight: 1.00 lb
Interface: Ethernet
Unspsc Code: 32101621
4X77A91000: ThinkSystem 96GB E3.S 2T CXL DIMM
4X77A91001: ThinkSystem 128GB E3.S 2T CXL DIMM
4X77A90998: ThinkSystem 32GB TruDDR5 8800MHz (2Rx8) MRDIMM
4X77A90999: ThinkSystem 64GB TruDDR5 8800MHz (2Rx4) MRDIMM
4X77A90964: ThinkSystem 32GB TruDDR5 6400MHz (1Rx4) RDIMM
4X77A90966: ThinkSystem 64GB TruDDR5 6400MHz (2Rx4) RDIMM
4X77A90997: ThinkSystem 96GB TruDDR5 6400MHz (2Rx4) RDIMM
4X77A90993: ThinkSystem 128GB TruDDR5 6400MHz (2Rx4) RDIMM
4X77A90963: ThinkSystem 16GB TruDDR5 6400MHz (1Rx8) RDIMM
4X77A90965: ThinkSystem 32GB TruDDR5 6400MHz (2Rx8) RDIMM
4X77A90996: ThinkSystem 48GB TruDDR5 6400MHz (2Rx8) RDIMM
4X77A90994: ThinkSystem 256GB TruDDR5 6400MHz (4Rx4) 3DS RDIMM
4X77A93526: ThinkSystem 32GB TruDDR5 6400MHz (1Rx4) RDIMM-A
4X77A93528: ThinkSystem 64GB TruDDR5 6400MHz (2Rx4) RDIMM-A
4X77A93533: ThinkSystem 96GB TruDDR5 6400MHz (2Rx4) RDIMM-A
4X77A93529: ThinkSystem 128GB TruDDR5 6400MHz (2Rx4) RDIMM-A
4X77B07418: ThinkSystem 32GB TruDDR5 6400MHz (1Rx4) RDIMM-A v2
4X77B09750: ThinkSystem SR635 V3/SR655 V3 32GB TruDDR5 6400MHz (1Rx4) RDIMM-A v2
4X77B09790: ThinkSystem SR645 V3/SR665 V3 32GB TruDDR5 6400MHz (1Rx4) RDIMM-A v2
4X77B07420: ThinkSystem 64GB TruDDR5 6400MHz (2Rx4) RDIMM-A v2
4X77B09643: ThinkSystem SR635 V3/SR655 V3 64GB TruDDR5 6400MHz (2Rx4) RDIMM-A v2
4X77B09788: ThinkSystem SR645 V3/SR665 V3 64GB TruDDR5 6400MHz (2Rx4) RDIMM-A v2
4X77B07424: ThinkSystem 96GB TruDDR5 6400MHz (2Rx4) RDIMM-A v2
4X77B07421: ThinkSystem 128GB TruDDR5 6400MHz (2Rx4) RDIMM-A v2
4X77A93525: ThinkSystem 16GB TruDDR5 6400MHz (1Rx8) RDIMM-A
4X77A93527: ThinkSystem 32GB TruDDR5 6400MHz (2Rx8) RDIMM-A
4X77A93532: ThinkSystem 48GB TruDDR5 6400MHz (2Rx8) RDIMM-A
4X77B07417: ThinkSystem 16GB TruDDR5 6400MHz (1Rx8) RDIMM-A v2
4X77B10304: ThinkSystem SR645 V3/SR665 V3 16GB TruDDR5 6400MHz (1Rx8) RDIMM-A v2
4X77B10268: ThinkSystem SR635 V3/SR655 V3 16GB TruDDR5 6400MHz (1Rx8) RDIMM-A v2
4X77B07419: ThinkSystem 32GB TruDDR5 6400MHz (2Rx8) RDIMM-A v2
4X77B09751: ThinkSystem SR635 V3/SR655 V3 32GB TruDDR5 6400MHz (2Rx8) RDIMM-A v2
4X77B09789: ThinkSystem SR645 V3/SR665 V3 32GB TruDDR5 6400MHz (2Rx8) RDIMM-A v2
4X77B07422: ThinkSystem 256GB TruDDR5 6400MHz (4Rx4) 3DS RDIMM-A
4X77A93599: ThinkEdge 16GB TruDDR5 5600MHz (1Rx8) SODIMM
4X77A93600: ThinkEdge 32GB TruDDR5 5600MHz (2Rx8) SODIMM
4X77A96507: ThinkEdge 8GB TruDDR5 6400MHz CSODIMM
4X77A96508: ThinkEdge 16GB TruDDR5 6400MHz CSODIMM
4X77A96509: ThinkEdge 32GB TruDDR5 6400MHz CSODIMM
4X77A93557: ThinkSystem 32GB TruDDR5 5600MHz (2Rx8) ECC UDIMM-A
4X77A93556: ThinkSystem 16GB TruDDR5 5600MHz (1Rx8) ECC UDIMM-A
4X77A90991: ThinkSystem 32GB TruDDR5 Performance+ 5600MHz (2Rx8) RDIMM
4X77A90992: ThinkSystem 64GB TruDDR5 Performance+ 5600MHz (2Rx4) RDIMM
4X77A88049: ThinkSystem 32GB TruDDR5 5600MHz (1Rx4) RDIMM
4X77A88052: ThinkSystem 64GB TruDDR5 5600MHz (2Rx4) RDIMM
4X77B00032: ThinkSystem 64GB TruDDR5 5600MHz (2Rx4) 10x4 RDIMM
4X77A88639: ThinkSystem 48GB TruDDR5 5600MHz (1Rx4) RDIMM
4X77A88058: ThinkSystem 96GB TruDDR5 5600MHz (2Rx4) RDIMM
4X77B00033: ThinkSystem 96GB TruDDR5 5600MHz (2Rx4) 10x4 RDIMM
4X77A93887: ThinkSystem 128GB TruDDR5 5600MHz (2Rx4) RDIMM
4X77A88087: ThinkSystem 16GB TruDDR5 5600MHz (1Rx8) RDIMM
4X77A88051: ThinkSystem 32GB TruDDR5 5600MHz (2Rx8) RDIMM
4X77A88056: ThinkSystem 24GB TruDDR5 5600MHz (1Rx8) RDIMM
4X77A88057: ThinkSystem 48GB TruDDR5 5600MHz (2Rx8) RDIMM
4X77A88054: ThinkSystem 128GB TruDDR5 5600MHz (4Rx4) 3DS RDIMM
4X77A88055: ThinkSystem 256GB TruDDR5 5600 MHz (8Rx4) 3DS RDIMM
4X77A99751: ThinkSystem 16GB TruDDR5 5600MHz (1Rx8) ECC UDIMM
4X77A99752: ThinkSystem 32GB TruDDR5 5600MHz (2Rx8) ECC UDIMM
4X77A77483: BNW5
4X77A77033: ThinkSystem 64GB TruDDR5 4800MHz (2Rx4) 9x4 RDIMM
4X77A77030: ThinkSystem 32GB TruDDR5 4800MHz (1Rx4) 10x4 RDIMM
4X77A77032: ThinkSystem 64GB TruDDR5 4800MHz (2Rx4) 10x4 RDIMM
4X77A94004: ThinkSystem SR950 V3 32GB TruDDR5 4800MHz (1Rx4) 10x4 RDIMM
4X77A94006: C0W8
4X77A87034: ThinkSystem 96GB TruDDR5 4800MHz (2Rx4) RDIMM
4X77A77029: ThinkSystem 16GB TruDDR5 4800MHz (1Rx8) RDIMM
4X77A77031: ThinkSystem 32GB TruDDR5 4800MHz (2Rx8) RDIMM
4X77A87033: ThinkSystem 48GB TruDDR5 4800MHz (2Rx8) RDIMM
4X77A77034: ThinkSystem 128GB TruDDR5 4800MHz (4Rx4) 3DS RDIMM v2
Cto Only: B21T
4X77A77035: ThinkSystem 256GB TruDDR5 4800MHz (8Rx4) 3DS RDIMM v2
4X77A88512: ThinkSystem 32GB TruDDR5 4800MHz (2Rx8) ECC UDIMM
4X77A88511: ThinkSystem 16GB TruDDR5 4800MHz (1Rx8) ECC UDIMM
4X77A81439: BQ3E
4X77A81442: ThinkSystem 64GB TruDDR5 4800MHz (2Rx4) 9x4 RDIMM-A
4X77A81438: ThinkSystem 32GB TruDDR5 4800MHz (1Rx4) 10x4 RDIMM-A
4X77A81441: ThinkSystem 64GB TruDDR5 4800MHz (2Rx4) 10x4 RDIMM-A
4X77A81448: ThinkSystem 96GB TruDDR5 4800MHz (2Rx4) 10x4 RDIMM-A
4X77A96982: ThinkSystem 128GB TruDDR5 5600MHz (2Rx4) RDIMM-A
4X77A81437: ThinkSystem 16GB TruDDR5 4800MHz (1Rx8) RDIMM-A
4X77A85812: BUVT
4X77A81440: ThinkSystem 32GB TruDDR5 4800MHz (2Rx8) RDIMM-A
4X77A81447: ThinkSystem 48GB TruDDR5 4800MHz (2Rx8) RDIMM-A
4X77A81443: ThinkSystem 128GB TruDDR5 4800MHz (4Rx4) 3DS RDIMM-A v2
4X77A81444: ThinkSystem 256GB TruDDR5 4800MHz (8Rx4) 3DS RDIMM-A v2
4X77A08632: ThinkSystem 16GB TruDDR4 3200 MHz (2Rx8 1.2V) RDIMM
4X77A08633: ThinkSystem 32GB TruDDR4 3200 MHz (2Rx4 1.2V) RDIMM
4X77A83361: ThinkSystem 32GB TruDDR4 3200 MHz (2Rx4 1.2V) RDIMM Extended Temperature
4X77A08634: ThinkSystem 32GB TruDDR4 3200 MHz (2Rx8 1.2V) RDIMM
4X77A08635: ThinkSystem 64GB TruDDR4 3200 MHz (2Rx4 1.2V) RDIMM
4X77A85855: ThinkSystem SE350 16GB TruDDR4 3200 MHz (2Rx8 1.2V) RDIMM
4X77A85861: ThinkSystem SE350 32GB TruDDR4 3200 MHz (2Rx4 1.2V) RDIMM
4X77A08636: ThinkSystem 128GB TruDDR4 3200 MHz (4Rx4 1.2V) 3DS RDIMM
4X77A77494: ThinkSystem 8GB TruDDR4 3200 MHz (1Rx8, 1.2V) ECC UDIMM
4X77A77495: ThinkSystem 16GB TruDDR4 3200 MHz (2Rx8, 1.2V) ECC UDIMM
4X77A77496: ThinkSystem 32GB TruDDR4 3200MHz (2Rx8, 1.2V) ECC UDIMM
4Zc7A15121: ThinkSystem 16GB TruDDR4 3200MHz (2Rx8 1.2V) RDIMM-A
4Zc7A15122: ThinkSystem 32GB TruDDR4 3200MHz (2Rx4 1.2V) RDIMM-A
4Zc7A15123: ThinkSystem 32GB TruDDR4 3200 MHz (2Rx8 1.2V) RDIMM-A
4Zc7A15124: ThinkSystem 64GB TruDDR4 3200MHz (2Rx4 1.2V) RDIMM-A
4Zc7A15125: ThinkSystem 128GB TruDDR4 3200MHz (4Rx4, 1.2V) 3DS RDIMM-A
4X77A12188: ThinkSystem 32GB TruDDR4 Performance+ 3200 MHz (2Rx8 1.2V) RDIMM-A
4X77A12189: ThinkSystem 64GB TruDDR4 Performance+ 3200 MHz (2Rx4 1.2V) RDIMM-A
4Zc7A08706: ThinkSystem 8GB TruDDR4 2933MHz (1Rx8 1.2V) RDIMM
4Zc7A08707: ThinkSystem 16GB TruDDR4 2933 MHz (1Rx4 1.2V) RDIMM
4Zc7A08708: ThinkSystem 16GB TruDDR4 2933MHz (2Rx8 1.2V) RDIMM
4Zc7A08709: ThinkSystem 32GB TruDDR4 2933MHz (2Rx4 1.2V) RDIMM
4Zc7A08710: ThinkSystem 64GB TruDDR4 2933MHz (2Rx4 1.2V) RDIMM
4Zc7A15113: ThinkSystem 128GB TruDDR4 2933MHz (4Rx4 1.2V) 3DS RDIMM
4Zc7A08727: ThinkSystem 256GB TruDDR4 2933MHz (8Rx4 1.2V) 3DS RDIMM
4X77A12184: ThinkSystem 16GB TruDDR4 Performance+ 2933MHz (2Rx8 1.2V) RDIMM
4X77A12185: ThinkSystem 32GB TruDDR4 Performance+ 2933MHz (2Rx4 1.2V) RDIMM
4X77A12186: ThinkSystem 64GB TruDDR4 Performance+ 2933MHz (2Rx4 1.2V) RDIMM
4X77A12187: ThinkSystem 128GB TruDDR4 Performance+ 2933MHz (4Rx4 1.2V) 3DS RDIMM
4X77A64957: ThinkSystem 256GB TruDDR4 Performance+ 2933MHz (8Rx4 1.2V) 3DS RDIMM
4Zc7A08739: ThinkSystem 8GB TruDDR4 2933MHz (1Rx8 1.2V) RDIMM-A
4Zc7A08740: ThinkSystem 16GB TruDDR4 2933MHz (1Rx4 1.2V) RDIMM-A
4Zc7A08741: ThinkSystem 16GB TruDDR4 2933MHz (2Rx8 1.2V) RDIMM-A
4Zc7A08742: ThinkSystem 32GB TruDDR4 2933MHz (2Rx4 1.2V) RDIMM-A
4Zc7A08744: ThinkSystem 64GB TruDDR4 2933MHz (2Rx4 1.2V) RDIMM-A
7X77A01301: ThinkSystem 8GB TruDDR4 2666 MHz (1Rx8 1.2V) RDIMM
7X77A01302: ThinkSystem 16GB TruDDR4 2666 MHz (1Rx4 1.2V) RDIMM
7X77A01303: ThinkSystem 16GB TruDDR4 2666 MHz (2Rx8 1.2V) RDIMM
7X77A01304: ThinkSystem 32GB TruDDR4 2666 MHz (2Rx4 1.2V) RDIMM
7X77A01305: ThinkSystem 64GB TruDDR4 2666 MHz (4Rx4 1.2V) LRDIMM
4X77A78614: ThinkSystem SE350 64GB TruDDR4 2666 MHz (4Rx4 1.2V) LRDIMM
4Zc7A08716: ThinkSystem 64GB TruDDR4 2666MHz (4Rx4, 1.2V) 3DS RDIMM
7X77A01307: ThinkSystem 128GB TruDDR4 2666 MHz (8Rx4 1.2V) 3DS RDIMM
4Zc7A08696: ThinkSystem 8GB TruDDR4 2666MHz (1Rx8, 1.2V) UDIMM
4Zc7A08699: ThinkSystem 16GB TruDDR4 2666MHz (2Rx8, 1.2V) UDIMM
4Zc7A15142: ThinkSystem 32GB TruDDR4 2666MHz (2Rx8, 1.2V) ECC UDIMM
4Zc7A08700: ThinkSystem 4GB TruDDR4 2666MHz (1Rx16, 1.2V) Non-ECC UDIMM
4Zc7A08701: B35M
4Zc7A08702: ThinkSystem 16GB TruDDR4 2666MHz (2Rx8, 1.2V) Non-ECC UDIMM
4X77A75933: ThinkSystem 128GB TruDDR5 4400MHz Intel Optane PMem
4X77A75934: ThinkSystem 256GB TruDDR5 4400MHz Intel Optane PMem
4X77A75935: ThinkSystem 512GB TruDDR5 4400MHz Intel Optane PMem
4Zc7A08732: ThinkSystem 128GB TruDDR4 3200MHz (1.2V) Intel Optane Persistent Memory
4Zc7A08734: ThinkSystem 256GB TruDDR4 3200MHz (1.2V) Intel Optane Persistent Memory
4Zc7A08736: ThinkSystem 512GB TruDDR4 3200MHz (1.2V) Intel Optane Persistent Memory
4Zc7A15110: ThinkSystem 128GB TruDDR4 2666MHz (1.2V) Intel Optane DC Persistent Memory
4Zc7A15111: ThinkSystem 256GB TruDDR4 2666MHz (1.2V) Intel Optane DC Persistent Memory
4Zc7A15112: ThinkSystem 512GB TruDDR4 2666MHz (1.2V) Intel Optane DC Persistent Memory
Cto Only: B693
Sr635 V3 (7D9H / 7D9G: SR655 V3 (7D9F / 7D9E)
By8F: ThinkSystem 128GB TruDDR5 4800MHz (4Rx4) 3DS RDIMM v1
Bzpm: ThinkSystem 256GB TruDDR5 4800MHz (8Rx4) 3DS RDIMM v1
Bzpn: ThinkSystem 256GB TruDDR5 4800MHz (8Rx4) 3DS RDIMM-A v1
Sr850 V3 (7D97 / 7D96: SR860 V3 (7D94 / 7D93)
Sc750 V4 (7Ddj: SC777 V4 (7DKA)
Sd630 V2 (7D1K: SD650 V2 (7D1M)
St550 (7X09 / 7X10: SR530 (7X07 / 7X08)
Operating Systems: SR590 (Xeon Gen 2)
Red Hat Enterprise Linux 9.4: N
Red Hat Enterprise Linux 9.5: N
Red Hat Enterprise Linux 9.6: N
Red Hat Enterprise Linux 10.0: Y
Suse Linux Enterprise Server 15 Sp6: N
Suse Linux Enterprise Server 15 Sp7: N
Suse Linux Enterprise Server 16: Y
Microsoft Windows Server 2019: Y
Microsoft Windows Server 2022: Y
Microsoft Windows Server 2025: Y
Red Hat Enterprise Linux 8.2: Y
Red Hat Enterprise Linux 8.3: Y
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