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PartsTable / MEMORY / 38L5903
38L5903 ✓ Verified by PartsTable
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: 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
IBM 1 GB PC2-5300 CL5 ECC DDR2

The IBM 1 GB Pc2-5300 Cl5 ECC Ddr2 is a IBM memory module engineered for enterprise server and workstation platforms requiring validated, high-reliability memory. 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→ 38L5903
SPECIFICATIONS
Part Number38L5903
ManufacturerIBM
Capacity1GB
COMPONENT DIAGRAM
ECC 1GB 2Rx4 PC4 — RDIMM IBM 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 38L5903 MFR IBM 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 2
39M5785Compatible
IBM 2Gb PC2-5300F 667Mhz ECC FBD DR x8 CL5 (2x1Gb) Memory Kit for M1/HS21 - Option
compatible
39M5784Compatible
IBM 1GB Pc2-5300f 667MHZ ECC Fbd Dr X8 Cl5 Dimm - Fru
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 2
39M5784SUBSTITUTE
IBM 1Gb PC2-5300F 667Mhz ECC FBD DR x8 CL5 DIMM - P/N
IBM
39M5785SUBSTITUTE
IBM 1Gb PC2-5300F 667Mhz ECC FBD DR x8 CL5 DIMM - P/N
IBM
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FREQUENTLY ASKED QUESTIONS
What is 38L5903?
38L5903 is a IBM 1 GB Pc2-5300 Cl5 ECC Ddr2 manufactured by IBM. It is classified as a MEMORY (RDIMM).
What parts can replace 38L5903?
There are 2 known substitutes for 38L5903: 39M5785, 39M5784. Substitute compatibility should be verified for your specific system.
Is 38L5903 still available?
38L5903 is currently Unknown.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: July 2026