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721101-001 — Memory Specs & Substitutes

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HPE · 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 16Gb PC3-12800R 1600Mhz ECC REG DR x4 CAS-11 DIMM - Intel v1 - G8. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
721101-001
SPECIFICATIONS
Part Number721101-001
ManufacturerHPE
Capacity16GB
Speed1600MHz
COMPONENT DIAGRAM
ECC 16GB 2Rx4 PC4 1600MHz RDIMM HPE NOTCH ~133.35 mm DDR4 RDIMM | 16GB | 1600MHz | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN 721101-001 MFR HPE 16GB 1600MHz
KEY FEATURES
•
16GB Capacity
•
1600MHz Speed
•
Generation 8 Platform
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 3
672631-B21Compatible
HP 16Gb PC3-12800R 1600Mhz ECC REG DR x4 CAS-11 DIMM - Intel v1 - G8
compatible
684031-001Compatible
HP 16Gb PC3-12800R 1600Mhz ECC REG DR x4 CAS-11 DIMM - Intel v1 - G8
compatible
672612-081Compatible
HP 16Gb PC3-12800R 1600Mhz ECC REG DR x4 CAS-11 DIMM - Intel v1 - G8
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 6
A2Z52AASUBSTITUTE
HP 16Gb PC3-12800R 1600Mhz ECC REG DR x4 CAS-11 DIMM - Intel v1 - G8
HPE
672309-581SUBSTITUTE
HP 16Gb PC3-12800R 1600Mhz ECC REG DR x4 CAS-11 DIMM - Intel v1 - G8
HPE
672612-081SUBSTITUTE
HP 16Gb PC3-12800R 1600Mhz ECC REG DR x4 CAS-11 DIMM - Intel v1 - G8
HPE
672631-B21SUBSTITUTE
HP 16Gb PC3-12800R 1600Mhz ECC REG DR x4 CAS-11 DIMM - Intel v1 - G8
HPE
682415-001SUBSTITUTE
HP 16Gb PC3-12800R 1600Mhz ECC REG DR x4 CAS-11 DIMM - Intel v1 - G8
HPE
684031-001SUBSTITUTE
HP 16Gb PC3-12800R 1600Mhz ECC REG DR x4 CAS-11 DIMM - Intel v1 - G8
HPE
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FREQUENTLY ASKED QUESTIONS
What is 721101-001?
721101-001 is a HP 16Gb PC3-12800R 1600Mhz ECC REG DR x4 CAS-11 DIMM - Intel v1 - G8 manufactured by HPE.
What parts can replace 721101-001?
There are 3 known substitutes for 721101-001: 672631-B21, 684031-001, 672612-081. Substitute compatibility should be verified for your specific system.
Is 721101-001 still available?
721101-001 is currently Unknown.
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Last verified: September 2026