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PartsTable / MEMORY / 00NU400
00NU400 ✓ 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 16GB (1x16GB) 2RX4 PC4-17000P-R DDR4-2133MHZ RDIMM

LENOVO 16GB (1x16GB) 2RX4 PC4-17000P-R DDR4-2133MHZ RDIMM. Key specifications include Rank: Single Rank, Speed: DDR4-2666, Voltage: 1.2V, Capacity: 16GB, Form Factor: RDIMM, Organization: 1Rx4. 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→ 00NU400
SPECIFICATIONS
RankSingle Rank
SpeedDDR4-2666
Voltage1.2V
Capacity16GB
Form FactorRDIMM
Organization1Rx4
COMPONENT DIAGRAM
ECC 16GB 2Rx4 PC4 2133MHz RDIMM LENOV NOTCH ~133.35 mm DDR4 RDIMM | 16GB | 2133MHz | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN 00NU400 MFR LENOVO 16GB 2133MHz
KEY FEATURES
•
DDR4 Interface
•
16GB Capacity
•
2133MHz Speed
•
DDR4 RDIMM
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 4
95Y4821Compatible
IBM 16Gb PC4-2133P-R ECC REG DR x4 CAS-15 (1x16Gb) Memory Kit for Flex System x240 M5 - Option
compatible
01DE966Compatible
IBM 16GB PC4-2133P-R ECC Reg Dr X4 Cas-15 Dimm - Fru
compatible
95Y4820Compatible
IBM 16Gb PC4-2133P-R ECC REG DR x4 CAS-15 (1x16Gb) Memory Kit for Flex System x240 M5 - SBB
compatible
95Y4823Compatible
IBM 16GB PC4-2133P-R ECC Reg Dr X4 Cas-15 Dimm - Fru
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 4
95Y4820SUBSTITUTE
IBM 16Gb PC4-2133P-R ECC REG DR x4 CAS-15 DIMM - P/N
IBM
95Y4821SUBSTITUTE
IBM 16Gb PC4-2133P-R ECC REG DR x4 CAS-15 DIMM - P/N
IBM
95Y4823SUBSTITUTE
IBM 16Gb PC4-2133P-R ECC REG DR x4 CAS-15 DIMM - P/N
IBM
01DE966SUBSTITUTE
IBM 16Gb PC4-2133P-R ECC REG DR x4 CAS-15 DIMM - P/N
IBM
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FREQUENTLY ASKED QUESTIONS
What is 00NU400?
00NU400 is a Lenovo 16GB (1x16gb) 2Rx4 Pc4-17000p-R DDR4-2133MHZ RDIMM manufactured by LENOVO. It is classified as a MEMORY (RDIMM).
What parts can replace 00NU400?
There are 4 known substitutes for 00NU400: 95Y4821, 01DE966, 95Y4820 and 1 more. Substitute compatibility should be verified for your specific system.
Is 00NU400 still available?
00NU400 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