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43X5303 — Memory Specs & Substitutes

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IBM · 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: Double-check what you're quoting in volatile market.
HOT market — DDR5/DDR4 extremely volatile
PRODUCT OVERVIEW
IBM 8GB PC3-8500 DDR3-1066MHz VLP

IBM 8GB PC3-8500 DDR3-1066MHz VLP. 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→ 43X5303
SPECIFICATIONS
Part Number43X5303
ManufacturerIBM
InterfaceDDR3
Capacity8GB
Speed1066MHz
COMPONENT DIAGRAM
ECC 8GB 2Rx4 PC3 1066MHz RDIMM IBM NOTCH ~133.35 mm DDR3 RDIMM | 8GB | 1066MHz | PC3 Notch position = DDR3 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR3 RDIMM PN 43X5303 MFR IBM 8GB 1066MHz
KEY FEATURES
•
DDR3 Interface
•
8GB Capacity
•
1066MHz 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 5
44T1579CompatiblePARTNER
IBM 8Gb PC3-8500R 1066Mhz ECC REG DR x4 CAS-7 Low Profile (1x8Gb) Memory Kit for HS22/HS22V - Option
compatible
43X5294CompatiblePARTNER
IBM 8Gb PC3-8500R 1066Mhz ECC REG DR x4 CAS-7 Low Profile DIMM - P/N
compatible
43X6303CompatiblePARTNER
IBM 8Gb PC3-8500R 1066Mhz ECC REG DR x4 CAS-7 Low Profile DIMM - P/N
compatible
44T1580CompatiblePARTNER
IBM 8Gb PC3-8500R 1066Mhz ECC REG DR x4 CAS-7 Low Profile DIMM - FRU
compatible
46C0529CompatibleBROKER-VERIFIED
IBM 8Gb PC3-8500R 1066Mhz ECC REG DR x4 CAS-7 Low Profile DIMM - FRU
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 5
43X5294SUBSTITUTE
IBM 8Gb PC3-8500R 1066Mhz ECC REG DR x4 CAS-7 Low Profile DIMM - P/N
IBM
43X6303SUBSTITUTE
IBM 8Gb PC3-8500R 1066Mhz ECC REG DR x4 CAS-7 Low Profile DIMM - P/N
IBM
44T1579SUBSTITUTE
IBM 8Gb PC3-8500R 1066Mhz ECC REG DR x4 CAS-7 Low Profile DIMM - P/N
IBM
44T1580SUBSTITUTE
IBM 8Gb PC3-8500R 1066Mhz ECC REG DR x4 CAS-7 Low Profile DIMM - P/N
IBM
46C0529SUBSTITUTE
IBM 8Gb PC3-8500R 1066Mhz ECC REG DR x4 CAS-7 Low Profile DIMM - P/N
IBM
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FREQUENTLY ASKED QUESTIONS
What is 43X5303?
43X5303 is a IBM 8GB Pc3-8500 DDR3-1066MHZ Vlp manufactured by IBM. It is classified as a MEMORY (RDIMM).
What parts can replace 43X5303?
There are 5 known substitutes for 43X5303: 44T1579, 43X5294, 43X6303 and 2 more. Substitute compatibility should be verified for your specific system.
Is 43X5303 still available?
43X5303 is currently Unknown.
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Last verified: October 2026