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PartsTable / MEMORY / 647903-B21
647903-B21 ✓ 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 32GB (1x32GB) 4RX4 PC3L-10600L DDR3-1333MHZ LRDIMM

32GB (1x32GB) Quad Rank x4 PC3L-10600L (DDR3-1333) Load Reduced CAS-9 Low Voltage Memory Kit. Key specifications include Rank: Quad Rank (4R), Speed: DDR4-2666, Voltage: 1.2V, Capacity: 128GB, Form Factor: LRDIMM, Organization: x4. 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→ 647903-B21
SPECIFICATIONS
RankQuad Rank (4R)
SpeedDDR4-2666
Voltage1.2V
Capacity128GB
Form FactorLRDIMM
Organizationx4
COMPONENT DIAGRAM
ECC 32GB 2Rx4 PC3 1333MHz LRDIMM HP NOTCH ~133.35 mm DDR3 LRDIMM | 32GB | 1333MHz | PC3 Notch position = DDR3 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR3 LRDIMM PN 647903-B21 MFR HP 32GB 1333MHz
KEY FEATURES
•
DDR3 Interface
•
32GB Capacity
•
1333MHz Speed
•
DDR3 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 2
664693-001Compatible
HP 32Gb PC3L-10600L 1333Mhz Load Reduced QR x4 CAS-9 LV DIMM - Intel v1 - G8
compatible
647654-081Compatible
HP 32Gb PC3L-10600L 1333Mhz Load Reduced QR x4 CAS-9 LV DIMM - Intel v1 - G8
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 5
A2Z53AASUBSTITUTE
HP 32Gb PC3L-10600L 1333Mhz Load Reduced QR x4 CAS-9 LV DIMM - Intel v1 - G8
HPE
647654-081SUBSTITUTE
HP 32Gb PC3L-10600L 1333Mhz Load Reduced QR x4 CAS-9 LV DIMM - Intel v1 - G8
HPE
664693-001SUBSTITUTE
HP 32Gb PC3L-10600L 1333Mhz Load Reduced QR x4 CAS-9 LV DIMM - Intel v1 - G8
HPE
674727-581SUBSTITUTE
HP 32Gb PC3L-10600L 1333Mhz Load Reduced QR x4 CAS-9 LV DIMM - Intel v1 - G8
HPE
684590-001SUBSTITUTE
HP 32Gb PC3L-10600L 1333Mhz Load Reduced QR x4 CAS-9 LV DIMM - Intel v1 - G8
HPE
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FREQUENTLY ASKED QUESTIONS
What is 647903-B21?
647903-B21 is a HP 32GB (1x32gb) 4Rx4 Pc3l-10600l DDR3-1333MHZ LRDIMM manufactured by HP. It is classified as a MEMORY (LRDIMM).
What parts can replace 647903-B21?
There are 2 known substitutes for 647903-B21: 664693-001, 647654-081. Substitute compatibility should be verified for your specific system.
Is 647903-B21 still available?
647903-B21 is currently Unknown.
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Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
Last verified: July 2026