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PP639AV — 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 1GB DDR-400 memory module 2 x 0.5 GB DDR2 240-pin DIMM ECC. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
PP639AV
SPECIFICATIONS
Part NumberPP639AV
ManufacturerHP
Capacity1GB
COMPONENT DIAGRAM
ECC 1GB 2Rx4 PC4 — RDIMM HP NOTCH ~133.35 mm DDR4 RDIMM | 1GB | — | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN PP639AV MFR HP 1GB —
KEY FEATURES
•
1GB Capacity
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
376638-B21Compatible
HP 1Gb PC2-3200R 400Mhz ECC REG CL3 240-Pin (2x512Mb) SDRAM Memory Kit - AMD
compatible
PP641AVCompatible
HP 2Gb PC2-3200R 400Mhz ECC REG CL3 240-Pin (4x512Mb) SDRAM Memory Kit - AMD for xw9300
compatible
PR788AVCompatible
HP 2Gb PC2-3200R 400Mhz ECC REG CL3 240-Pin (4x512Mb) SDRAM Memory Kit - AMD for xw9300
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 3
PP641AVSUBSTITUTE
HP 1Gb PC2-3200R 400Mhz ECC REG CL3 240-Pin (2x512Mb) SDRAM Memory Kit - AMD for xw9300
HPE
PR788AVSUBSTITUTE
HP 1Gb PC2-3200R 400Mhz ECC REG CL3 240-Pin (2x512Mb) SDRAM Memory Kit - AMD for xw9300
HPE
376638-B21SUBSTITUTE
HP 1Gb PC2-3200R 400Mhz ECC REG CL3 240-Pin (2x512Mb) SDRAM Memory Kit - AMD for xw9300
HPE
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FREQUENTLY ASKED QUESTIONS
What is PP639AV?
PP639AV is a HP 1GB DDR-400 memory module 2 x 0.5 GB DDR2 240-pin DIMM ECC manufactured by HP.
What parts can replace PP639AV?
There are 3 known substitutes for PP639AV: 376638-B21, PP641AV, PR788AV. Substitute compatibility should be verified for your specific system.
Is PP639AV still available?
PP639AV is currently Unknown.
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PartsTable Design LLC · partstable.com
Last verified: August 2026