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PartsTable / MEMORY / 633540-001
633540-001 ✓ 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

512MB flash backed write cache (FBWC) memory module, 40-bit wide - Does not include the controller board or capacitor module - For use with the P222 Smart Array controller. 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→ 633540-001
SPECIFICATIONS
Part Number633540-001
ManufacturerHP
Capacity512MB
COMPONENT DIAGRAM
ECC 512MB 2Rx4 PC4 — RDIMM HP NOTCH ~133.35 mm DDR4 RDIMM | 512MB | — | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN 633540-001 MFR HP 512MB —
KEY FEATURES
•
512MB 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 2
661069-B21Compatible
HP Smart Array FBWC 512Mb Kit for P222 P420 P421 includes FL Capacitor with 36in Cable
compatible
610672-001Compatible
HP Smart Array FBWC 512MB for P222
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 2
610672-001SUBSTITUTE
HP Smart Array FBWC 512Mb for P222
HPE
661069-B21SUBSTITUTE
HP Smart Array FBWC 512Mb for P222
HPE
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FREQUENTLY ASKED QUESTIONS
What is 633540-001?
633540-001 is a 512MB flash backed write cache (FBWC) memory module, 40-bit wide - Does not include the controller board or capacitor module - For use with the P222 Smart Array controller manufactured by HP. It is classified as a MEMORY (RDIMM).
What parts can replace 633540-001?
There are 2 known substitutes for 633540-001: 661069-B21, 610672-001. Substitute compatibility should be verified for your specific system.
Is 633540-001 still available?
633540-001 is currently Unknown.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026