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PartsTable / MEMORY / 4X77A81443
4X77A81443 ✓ Verified by PartsTable
LENOVO · MEMORY · RDIMM
WHAT YOU NEED TO KNOW
Memory is a hot market right now. DDR5 and DDR4 are extremely volatile with data centers driving availability to extreme lows. Always validate machine type and model. Remember: all RAM is Hynix, Samsung, or Micron underneath OEM labels — use that to find alternatives. Key checks: Check OEM alternatives — all RAM is Hynix/Samsung/Micron underneath. Double-check what you're quoting in volatile market.
HOT market — DDR5/DDR4 extremely volatile
PRODUCT OVERVIEW

Lenovo ThinkSystem 128GB TruDDR5 4800MHz 4Rx4 3DS RDIMM-A v2. Key specifications include Component for: PC/Server, Internal memory: 128 GB, Memory clock speed: 4800 MHz, Memory form factor: 288-pin DIMM, Buffered memory type: Registered (buffered), Internal memory type: DDR5. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
MEMORY→ RDIMM→ 4X77A81443
SPECIFICATIONS
Component forPC/Server
Internal memory128 GB
Memory clock speed4800 MHz
Memory form factor288-pin DIMM
Buffered memory typeRegistered (buffered)
Internal memory typeDDR5
Memory layout (modules x size)1 x 128 GB
COMPONENT DIAGRAM
ECC 128GB 2Rx4 PC4 4800MHz RDIMM LENOV NOTCH ~133.35 mm DDR4 RDIMM | 128GB | 4800MHz | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN 4X77A81443 MFR LENOVO 128GB 4800MHz
KEY FEATURES
•
Up to 128 GB
•
DDR5 Interface
•
128GB Capacity
•
4800MHz Speed
TYPICAL APPLICATIONS
  • Server memory expansion for virtualization workloads
  • Database performance optimization (in-memory computing)
  • VDI and remote desktop session hosting
  • High-performance computing (HPC) clusters
  • Mail server and collaboration platform scaling
  • Application server tier expansion
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
03GX339Compatible
IBM 128Gb PC5-4800B-R ECC REG QR x4 EC8 10x4 3DS DIMM for ThinkSystem - FRU
compatible
03LC497Compatible
IBM 128Gb PC5-4800B-R ECC REG QR x4 EC8 10x4 3DS DIMM PBB for ThinkSystem - FRU
compatible
03LC502Compatible
IBM 128Gb PC5-4800B-R ECC REG QR x4 EC8 10x4 3DS DIMM PBB for ThinkSystem - FRU
compatible
4X77A77034Compatible
IBM 128Gb PC5-4800B-R ECC REG QR x4 EC8 10x4 3DS DIMM for ThinkSystem - Option
compatible
SM37A88585Compatible
IBM 128Gb PC5-4800B-R ECC REG QR x4 EC8 10x4 3DS DIMM for ThinkSystem - P/N
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 5
SM37A88585SUBSTITUTE
IBM 128Gb PC5-4800B-R ECC REG QR x4 EC8 10x4 3DS DIMM for AMD ThinkSystem - Option
LENOVO
03GX339SUBSTITUTE
IBM 128Gb PC5-4800B-R ECC REG QR x4 EC8 10x4 3DS DIMM for AMD ThinkSystem - Option
LENOVO
03LC497SUBSTITUTE
IBM 128Gb PC5-4800B-R ECC REG QR x4 EC8 10x4 3DS DIMM for AMD ThinkSystem - Option
LENOVO
03LC502SUBSTITUTE
IBM 128Gb PC5-4800B-R ECC REG QR x4 EC8 10x4 3DS DIMM for AMD ThinkSystem - Option
LENOVO
4X77A77034SUBSTITUTE
IBM 128Gb PC5-4800B-R ECC REG QR x4 EC8 10x4 3DS DIMM for AMD ThinkSystem - Option
LENOVO
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FREQUENTLY ASKED QUESTIONS
What is 4X77A81443?
4X77A81443 is a Lenovo ThinkSystem 128GB TruDDR5 4800MHz 4Rx4 3DS RDIMM-A v2 manufactured by LENOVO. It is classified as a MEMORY (RDIMM).
What parts can replace 4X77A81443?
There are 5 known substitutes for 4X77A81443: 03GX339, 03LC497, 03LC502 and 2 more. Substitute compatibility should be verified for your specific system.
Is 4X77A81443 still available?
4X77A81443 is currently Unknown.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026