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FX621AA — 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

Upgrading your memory is a cost-effective way to improve system performance when insufficient memory and hard drive paging is slowing your applications down<br /><br />&bull;&nbsp;Faster start-up times with fewer delays during routine operations<br /><br /><br>&bull;&nbsp;More programs running simultaneously<br /><br /><br>&bull;&nbsp;Easy toggling between several open applications<br> Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
FX621AA
SPECIFICATIONS
Part NumberFX621AA
ManufacturerHPE
InterfaceDDR3
Capacity4GB
Speed1333MHz
COMPONENT DIAGRAM
ECC 4GB 2Rx4 PC3 1333MHz RDIMM HPE NOTCH ~133.35 mm DDR3 RDIMM | 4GB | 1333MHz | PC3 Notch position = DDR3 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR3 RDIMM PN FX621AA MFR HPE 4GB 1333MHz
KEY FEATURES
•
DDR3 Interface
•
4GB Capacity
•
1333MHz Speed
•
DDR3 Memory
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 7
500658-B21Compatible
HP 4Gb PC3-10600R 1333Mhz ECC REG DR x4 CAS-9 DIMM - Intel
compatible
501534-001Compatible
HP 4Gb PC3-10600R 1333Mhz ECC REG DR x4 CAS-9 (256Mx4) DIMM - Intel
compatible
500203-061Compatible
HP 4Gb PC3-10600R 1333Mhz DR x4 CAS-9 (256Mx4) DIMM - Intel
compatible
500203-361Compatible
HP 4Gb PC3-10600R 1333Mhz DR x4 CAS-9 (256Mx4) DIMM - Intel
compatible
500203-561Compatible
HP 4Gb PC3-10600R 1333Mhz DR x4 CAS-9 (256Mx4) DIMM - Intel
compatible
500659-B21Compatible
HP 4Gb PC3-10600R 1333Mhz DR x4 CAS-9 DIMM - Intel
compatible
LIFECYCLE
StatusEND OF LIFE
AvailabilitySecondary market only
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 7
500203-061SUBSTITUTE
HP 4Gb PC3-10600R 1333Mhz ECC REG DR CAS-9 DIMM - WS
HPE
500203-361SUBSTITUTE
HP 4Gb PC3-10600R 1333Mhz ECC REG DR CAS-9 DIMM - WS
HPE
500203-561SUBSTITUTE
HP 4Gb PC3-10600R 1333Mhz ECC REG DR CAS-9 DIMM - WS
HPE
500658-B21SUBSTITUTE
HP 4Gb PC3-10600R 1333Mhz ECC REG DR CAS-9 DIMM - WS
HPE
500659-B21SUBSTITUTE
HP 4Gb PC3-10600R 1333Mhz ECC REG DR CAS-9 DIMM - WS
HPE
501534-001SUBSTITUTE
HP 4Gb PC3-10600R 1333Mhz ECC REG DR CAS-9 DIMM - WS
HPE
536889-001SUBSTITUTE
HP 4Gb PC3-10600R 1333Mhz ECC REG DR CAS-9 DIMM - WS
HPE
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FREQUENTLY ASKED QUESTIONS
What is FX621AA?
FX621AA is a HP 4 GB (1x4GB) DDR3-1333 MHz ECC Registered DIMM memory module 240-pin DIMM manufactured by HPE.
What parts can replace FX621AA?
There are 7 known substitutes for FX621AA: 500658-B21, 501534-001, 500203-061 and 4 more. Substitute compatibility should be verified for your specific system.
Is FX621AA still available?
FX621AA is currently EOL_RISK.
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PartsTable Design LLC · partstable.com
Last verified: September 2026