PartsTable
Technical Data Sheet
TN78Y ✓ Verified by PartsTable
DELL · 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
DELL 32GB (1x32GB) 2RX4 PC4-21300V-R DDR4-2666MHZ RDIMM

Random Access Memory (RAM) is a type of hardware that your computer uses to store information. Adding memory is one of the most cost-effective ways to improve your computer's performance. Key specifications include Component for: PC/Server, Internal memory: 32 GB, Memory clock speed: 2666 MHz, Memory form factor: 288-pin DIMM, Internal memory type: DDR4, Harmonized System (HS) code: 84733020.

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 TN78Y
SPECIFICATIONS
Component forPC/Server
Internal memory32 GB
Memory clock speed2666 MHz
Memory form factor288-pin DIMM
Internal memory typeDDR4
Harmonized System (HS) code84733020
Memory layout (modules x size)1 x 32 GB
COMPONENT DIAGRAM
ECC 32GB 2Rx4 PC4 2666MHz RDIMM DELL NOTCH ~133.35 mm DDR4 RDIMM | 32GB | 2666MHz | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN TN78Y MFR DELL 32GB 2666MHz
KEY FEATURES
Up to 32 GB
DDR4 Interface
32GB Capacity
2666MHz 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 5
370-ADNFCompatible
Dell 32GB PC4-2666V-R ECC Reg Dr X4 Cas-19 Dimm - Spn
compatible
370-ADOTCompatible
Dell 32GB PC4-2666V-R ECC Reg Dr X4 Cas-19 Dimm - Spn
compatible
A9781929Compatible
Dell 32GB PC4-2666V-R ECC Reg Dr X4 Cas-19 Dimm - Dpn
compatible
SNPTN78YC/32GCompatible
Dell 32GB PC4-2666V-R ECC Reg Dr X4 Cas-19 Dimm - Mpn
compatible
SNPTN78YC/32VXRCompatible
Dell 32GB PC4-2666V-R ECC Reg Dr X4 Cas-19 Dimm - Mpn
compatible
LIFECYCLE
StatusUNKNOWN
Availability
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 5
A9781929SUBSTITUTE
Dell 32Gb PC4-2666V-R ECC REG DR x4 CAS-19 DIMM - APN
DELL
SNPTN78YC/32GSUBSTITUTE
Dell 32Gb PC4-2666V-R ECC REG DR x4 CAS-19 DIMM - APN
DELL
SNPTN78YC/32VXRSUBSTITUTE
Dell 32Gb PC4-2666V-R ECC REG DR x4 CAS-19 DIMM - APN
DELL
370-ADNFSUBSTITUTE
Dell 32Gb PC4-2666V-R ECC REG DR x4 CAS-19 DIMM - APN
DELL
370-ADOTSUBSTITUTE
Dell 32Gb PC4-2666V-R ECC REG DR x4 CAS-19 DIMM - APN
DELL
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FREQUENTLY ASKED QUESTIONS
What is TN78Y?
TN78Y is a Dell 32GB (1x32gb) 2Rx4 Pc4-21300V-R DDR4-2666MHZ RDIMM manufactured by DELL. It is classified as a MEMORY (RDIMM).
What parts can replace TN78Y?
There are 5 known substitutes for TN78Y: 370-ADNF, 370-ADOT, A9781929 and 2 more. Substitute compatibility should be verified for your specific system.
Is TN78Y still available?
TN78Y is currently Unknown.
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