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Technical Data Sheet
PartsTable / MEMORY / 840759-191
840759-191 ✓ Verified by PartsTable
Micron · 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

The 840759-191 is a Micron industrial component. 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→ 840759-191
SPECIFICATIONS
Part Number840759-191
ManufacturerMicron
COMPONENT DIAGRAM
ECC — 2Rx4 PC4 — RDIMM Micro NOTCH ~133.35 mm DDR4 RDIMM | — | — | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN 840759-191 MFR Micron — —
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
838085-B21Compatible
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - AMD - G10
compatible
868844-001Compatible
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - AMD - G10
compatible
838085-X21Compatible
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - AMD - G10
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 3
838085-B21SUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - AMD - G10
HPE
838085-X21SUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - AMD - G10
HPE
868844-001SUBSTITUTE
HP 64Gb PC4-2666V-L Load Reduced QR x4 CAS-19 DIMM - AMD - G10
HPE
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FREQUENTLY ASKED QUESTIONS
What is 840759-191?
840759-191 is a 840759-191 manufactured by Micron. It is classified as a MEMORY (RDIMM).
What parts can replace 840759-191?
There are 3 known substitutes for 840759-191: 838085-B21, 868844-001, 838085-X21. Substitute compatibility should be verified for your specific system.
Is 840759-191 still available?
840759-191 is currently Unknown.
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Last verified: July 2026