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840758-191 — Memory Specs & Substitutes

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HP · DIMM
WHAT YOU NEED TO KNOW
2Rx4 = Dual Rank ×4 chip width (standard server) RDIMM = Registered (servers) | LRDIMM = Load-Reduced (max density)
DDR3 ≠ DDR4 ≠ DDR5 — physically incompatible (notch position)
PRODUCT OVERVIEW

HP 840758-191 memory module 32 GB 1 x 32 GB DDR4 288-pin DIMM. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
840758-191
SPECIFICATIONS
Part Number840758-191
ManufacturerHP
InterfaceDDR4
Capacity32GB
COMPONENT DIAGRAM
ECC 32GB 2Rx4 PC4 — RDIMM HP NOTCH ~133.35 mm DDR4 RDIMM | 32GB | — | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN 840758-191 MFR HP 32GB —
KEY FEATURES
•
DDR4 Interface
•
32GB Capacity
•
DDR4 Memory
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
838083-B21Compatible
HP 32GB PC4-2666V-R ECC Reg Dr X4 Cas-19 Dimm - AMD - G10
compatible
868843-001Compatible
HP 32GB PC4-2666V-R ECC Reg Dr X4 Cas-19 Dimm - AMD - G10
compatible
838083-H21Compatible
HP 32GB PC4-2666V-R ECC Reg Dr X4 Cas-19 Dimm - AMD - G10
compatible
838083-K21Compatible
HP 32GB PC4-2666V-R ECC Reg Dr X4 Cas-19 Dimm - AMD - G10
compatible
838083-X21Compatible
HP 32GB PC4-2666V-R ECC Reg Dr X4 Cas-19 Dimm - AMD - G10
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 5
838083-B21SUBSTITUTE
HP 32Gb PC4-2666V-R ECC REG DR x4 CAS-19 DIMM - AMD - G10
HPE
838083-H21SUBSTITUTE
HP 32Gb PC4-2666V-R ECC REG DR x4 CAS-19 DIMM - AMD - G10
HPE
838083-K21SUBSTITUTE
HP 32Gb PC4-2666V-R ECC REG DR x4 CAS-19 DIMM - AMD - G10
HPE
838083-X21SUBSTITUTE
HP 32Gb PC4-2666V-R ECC REG DR x4 CAS-19 DIMM - AMD - G10
HPE
868843-001SUBSTITUTE
HP 32Gb PC4-2666V-R ECC REG DR x4 CAS-19 DIMM - AMD - G10
HPE
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FREQUENTLY ASKED QUESTIONS
What is 840758-191?
840758-191 is a HP 840758-191 memory module 32 GB 1 x 32 GB DDR4 288-pin DIMM manufactured by HP.
What parts can replace 840758-191?
There are 5 known substitutes for 840758-191: 838083-B21, 868843-001, 838083-H21 and 2 more. Substitute compatibility should be verified for your specific system.
Is 840758-191 still available?
840758-191 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: August 2026