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840756-091 ✓ Verified by PartsTable
HP · 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
HP 16GB (1x16GB) 2RX8 PC4-21300V-R DDR4-2666MHZ RDIMM

HP 16GB (1x16GB) 2RX8 PC4-21300V-R DDR4-2666MHZ RDIMM. 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→ 840756-091
SPECIFICATIONS
Part Number840756-091
ManufacturerHP
InterfaceDDR4
Capacity16GB
Speed2666MHz
COMPONENT DIAGRAM
ECC 16GB 2Rx4 PC4 2666MHz RDIMM HP 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 840756-091 MFR HP 16GB 2666MHz
KEY FEATURES
•
DDR4 Interface
•
16GB 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 12
835955-B21Compatible
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
compatible
868846-001Compatible
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
compatible
835955-H21Compatible
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
compatible
835955-K21Compatible
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
compatible
835955-X21Compatible
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
compatible
840756-09MCompatible
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 20
P00380-B21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
P01793-001SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
P02890-B21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
P05588-B21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
P05588-H21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
P06184-001SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
P07029-B21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
P08274-001SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
P18444-B21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
835955-B21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
835955-H21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
835955-K21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
835955-X21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
840756-09MSUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
840756-09SSUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
840756-C91SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
840756-C9SSUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
840756-K91SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
840756-V91SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
868846-001SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
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FREQUENTLY ASKED QUESTIONS
What is 840756-091?
840756-091 is a HP 16GB (1x16gb) 2Rx8 Pc4-21300V-R DDR4-2666MHZ RDIMM manufactured by HP. It is classified as a MEMORY (RDIMM).
What parts can replace 840756-091?
There are 12 known substitutes for 840756-091: 835955-B21, 868846-001, 835955-H21 and 9 more. Substitute compatibility should be verified for your specific system.
Is 840756-091 still available?
840756-091 is currently Unknown.
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Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
Last verified: July 2026