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7X77A01303 — Memory Specs & Substitutes

IBM · 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: Double-check what you're quoting in volatile market.
HOT market — DDR5/DDR4 extremely volatile
PRODUCT OVERVIEW

ThinkSystem 16GB TruDDR4 2666 MHz (2Rx8 1.2V) RDIMM. Key specifications include Component for: PC/Server, Memory voltage: 1.2 V, Internal memory: 16 GB, Memory clock speed: 2666 MHz, Memory form factor: RDIMM, Buffered memory type: Registered (buffered). 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→ 7X77A01303
SPECIFICATIONS
Component forPC/Server
Memory voltage1.2 V
Internal memory16 GB
Memory clock speed2666 MHz
Memory form factorRDIMM
Buffered memory typeRegistered (buffered)
Internal memory typeDDR4
Harmonized System (HS) code84733020
COMPONENT DIAGRAM
ECC 16GB 2Rx4 PC4 2666MHz RDIMM IBM NOTCH ~133.35 mm DDR4 RDIMM | 16GB | 2666MHz | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN 7X77A01303 MFR IBM 16GB 2666MHz
KEY FEATURES
•
Up to 16 GB
•
DDR4 Interface
•
16GB Capacity
•
2666MHz 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
SUBSTITUTES & CROSS-REFERENCES 3
01DE973SubstituteBROKER-VERIFIED
Lenovo ThinkSystem 16GB TruDDR4 2666 MHz (2Rx8 1.2V) RDIMM
substitute
SM30L13366CompatiblePARTNER
IBM 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM for ThinkSystem - P/N
compatible
SM30L13367CompatiblePARTNER
IBM 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM for ThinkSystem - P/N
compatible
LIFECYCLE

No lifecycle data available.

THIS PART SUBSTITUTES FOR 3
SM30L13366SUBSTITUTE
IBM 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 (1x16Gb) Memory Kit for ThinkSystem - Option
LENOVO
SM30L13367SUBSTITUTE
IBM 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 (1x16Gb) Memory Kit for ThinkSystem - Option
LENOVO
01DE973SUBSTITUTE
IBM 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 (1x16Gb) Memory Kit for ThinkSystem - Option
LENOVO
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FREQUENTLY ASKED QUESTIONS
What is 7X77A01303?
7X77A01303 is a ThinkSystem 16GB TruDDR4 2666 MHz (2Rx8 1.2V) RDIMM manufactured by IBM. It is classified as a MEMORY (RDIMM).
What parts can replace 7X77A01303?
There are 3 known substitutes for 7X77A01303: 01DE973, SM30L13366, SM30L13367. Substitute compatibility should be verified for your specific system.
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PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.