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95Y4821 ✓ 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

TruDDR4 Memory uses the highest quality components that are sourced from Tier 1 DRAM suppliers and only memory that meets the strict requirements of Lenovo is selected. It is compatibility tested and tuned on every System x server to maximize performance and reliability. TruDDR4 Memory has a unique signature that is programmed into the DIMM that enables System x servers to verify whether the memory that is installed is qualified or supported by Lenovo.

Because TruDDR4 Memory is authenticated, certain extended memory performance features can be enabled to extend performance over industry standards. From a service and support standpoint, Lenovo memory automatically assumes the Lenovo system warranty and Lenovo provides service and support worldwide.

WHERE IT FITS
MEMORY RDIMM 95Y4821
SPECIFICATIONS
ECCYes
CAS latency15
Component forPC/Server
Memory ranking2
Memory voltage1.2 V
Internal memory16 GB
Memory clock speed2133 MHz
Memory form factor288-pin DIMM
Compatible productsFlex System x240 M5
Buffered memory typeRegistered (buffered)
Internal memory typeDDR4
Memory layout (modules x size)1 x 16 GB
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 95Y4821 MFR LENOVO 16GB 2133MHz
KEY FEATURES
Up to 16 GB
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
00NU400Compatible
IBM 16GB PC4-2133P-R ECC Reg Dr X4 Cas-15 Dimm - P/n
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 (1x16Gb) Memory Kit for Flex System x240 M5 - Option
IBM
95Y4823SUBSTITUTE
IBM 16Gb PC4-2133P-R ECC REG DR x4 CAS-15 (1x16Gb) Memory Kit for Flex System x240 M5 - Option
IBM
00NU400SUBSTITUTE
IBM 16Gb PC4-2133P-R ECC REG DR x4 CAS-15 (1x16Gb) Memory Kit for Flex System x240 M5 - Option
IBM
01DE966SUBSTITUTE
IBM 16Gb PC4-2133P-R ECC REG DR x4 CAS-15 (1x16Gb) Memory Kit for Flex System x240 M5 - Option
IBM
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FREQUENTLY ASKED QUESTIONS
What is 95Y4821?
95Y4821 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 95Y4821?
There are 4 known substitutes for 95Y4821: 00NU400, 01DE966, 95Y4820 and 1 more. Substitute compatibility should be verified for your specific system.
Is 95Y4821 still available?
95Y4821 is currently Unknown.
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