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664691-001 ✓ 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 8GB (1x8GB) 1RX4 PC3-12800R DDR3-1600MHZ RDIMM

HP 8GB (1x8GB) 1RX4 PC3-12800R DDR3-1600MHZ 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→ 664691-001
SPECIFICATIONS
Part Number664691-001
ManufacturerHP
InterfaceDDR3
Capacity8GB
Speed1600MHz
COMPONENT DIAGRAM
ECC 8GB 2Rx4 PC3 1600MHz RDIMM HP NOTCH ~133.35 mm DDR3 RDIMM | 8GB | 1600MHz | PC3 Notch position = DDR3 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR3 RDIMM PN 664691-001 MFR HP 8GB 1600MHz
KEY FEATURES
•
DDR3 Interface
•
8GB Capacity
•
1600MHz Speed
•
DDR3 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 3
647899-B21Compatible
HP 8Gb PC3-12800R 1600Mhz ECC REG SR x4 CAS-11 DIMM - Intel v1 - G8
compatible
647651-081Compatible
HP 8Gb PC3-12800R 1600Mhz ECC REG SR x4 CAS-11 DIMM - Intel v1 - G8
compatible
647651-08MCompatible
HP 8Gb PC3-12800R 1600Mhz ECC REG SR x4 CAS-11 DIMM - Intel v1 - G8
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 3
647651-081SUBSTITUTE
HP 8Gb PC3-12800R 1600Mhz ECC REG SR x4 CAS-11 DIMM - Intel v1 - G8
HPE
647651-08MSUBSTITUTE
HP 8Gb PC3-12800R 1600Mhz ECC REG SR x4 CAS-11 DIMM - Intel v1 - G8
HPE
647899-B21SUBSTITUTE
HP 8Gb PC3-12800R 1600Mhz ECC REG SR x4 CAS-11 DIMM - Intel v1 - G8
HPE
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FREQUENTLY ASKED QUESTIONS
What is 664691-001?
664691-001 is a HP 8GB (1x8gb) 1Rx4 Pc3-12800r DDR3-1600MHZ RDIMM manufactured by HP. It is classified as a MEMORY (RDIMM).
What parts can replace 664691-001?
There are 3 known substitutes for 664691-001: 647899-B21, 647651-081, 647651-08M. Substitute compatibility should be verified for your specific system.
Is 664691-001 still available?
664691-001 is currently Unknown.
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Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
Last verified: July 2026