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840759-091 ✓ Verified by PartsTable
HP · MEMORY · LRDIMM
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
HP 64GB (1x64GB) 4RX4 PC4-21300V-L DDR4-2666MHZ LRDIMM

HP 64GB (1x64GB) 4RX4 PC4-21300V-L DDR4-2666MHZ LRDIMM. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
MEMORY→ LRDIMM→ 840759-091
SPECIFICATIONS
Part Number840759-091
ManufacturerHP
InterfaceDDR4
Capacity64GB
Speed2666MHz
COMPONENT DIAGRAM
ECC 64GB 2Rx4 PC4 2666MHz LRDIMM HP NOTCH ~133.35 mm DDR4 LRDIMM | 64GB | 2666MHz | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 LRDIMM PN 840759-091 MFR HP 64GB 2666MHz
KEY FEATURES
•
DDR4 Interface
•
64GB Capacity
•
2666MHz Speed
•
DDR4 LRDIMM
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 12
815101-B21Compatible
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
compatible
850882-001Compatible
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
compatible
815101-H21Compatible
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
compatible
815101-K21Compatible
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
compatible
815101-X21Compatible
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
compatible
840759-091UCompatible
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 18
880842-B21SUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
882362-091SUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
882449-001SUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
HMAA8GL7AMR4N-VKSUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
P00603-001SUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
P04178-001SUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
P18446-B21SUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
P28223-B21SUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
Q1V93ASUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
Q2D33ASUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
815101-B21SUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
815101-H21SUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
815101-K21SUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
815101-X21SUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
840759-091USUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
840759-691SUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
840759-791SUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
850882-001SUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - Intel - G10
HPE
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FREQUENTLY ASKED QUESTIONS
What is 840759-091?
840759-091 is a HP 64GB (1x64gb) 4Rx4 Pc4-21300V-L DDR4-2666MHZ LRDIMM manufactured by HP. It is classified as a MEMORY (LRDIMM).
What parts can replace 840759-091?
There are 12 known substitutes for 840759-091: 815101-B21, 850882-001, 815101-H21 and 9 more. Substitute compatibility should be verified for your specific system.
Is 840759-091 still available?
840759-091 is currently Unknown.
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Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
Last verified: July 2026