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49Y1561 — Memory Specs & Substitutes

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 MEMORY 4GB 1RX4 PC3 12800R 1600MHZ

Memory offerings let you upgrade your system's standard memory capacity to improve overall PC system performance. Adding additional memory is a cost-effective way to help boost your system's performance and enhance its ability to run more programs simultaneously. 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→ 49Y1561
SPECIFICATIONS
Part Number49Y1561
ManufacturerIBM
Capacity4GB
Speed1600MHz
FITS THESE MACHINES
Lenovo System x IBM System x3650 M4
Lenovo System x3300 M4
Lenovo System x3500 M4
Lenovo System x3530 M4
Lenovo System x3550 M4
Lenovo System x3630 M4
Lenovo System x3750 M4
COMPONENT DIAGRAM
ECC 4GB 2Rx4 PC4 1600MHz RDIMM IBM NOTCH ~133.35 mm DDR4 RDIMM | 4GB | 1600MHz | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN 49Y1561 MFR IBM 4GB 1600MHz
KEY FEATURES
•
4GB Capacity
•
1600MHz Speed
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
SUBSTITUTES & CROSS-REFERENCES 4
49J0168SubstituteBROKER-VERIFIED
IBM Memory 4GB 1Rx4 Pc3 12800r 1600MHZ
substitute
49Y1559CompatiblePARTNER
IBM 4Gb PC3-12800R 1600Mhz ECC REG SR x4 CAS-11 (1x4Gb) Memory Kit Intel v1 for M4 - Option
compatible
00KA733CompatiblePARTNER
IBM 4GB Pc3-12800r 1600MHZ ECC Reg Sr X4 Cas-11 Dimm - Fru
compatible
47J0168CompatiblePARTNER
IBM 4GB Pc3-12800r 1600MHZ ECC Reg Sr X4 Cas-11 Dimm - P/n
compatible
LIFECYCLE

No lifecycle data available.

THIS PART SUBSTITUTES FOR 3
00KA733SUBSTITUTE
IBM 4Gb PC3-12800R 1600Mhz ECC REG SR x4 CAS-11 DIMM - FRU
IBM
47J0168SUBSTITUTE
IBM 4Gb PC3-12800R 1600Mhz ECC REG SR x4 CAS-11 DIMM - FRU
IBM
49Y1559SUBSTITUTE
IBM 4Gb PC3-12800R 1600Mhz ECC REG SR x4 CAS-11 DIMM - FRU
IBM
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FREQUENTLY ASKED QUESTIONS
What is 49Y1561?
49Y1561 is a IBM Memory 4GB 1Rx4 Pc3 12800r 1600MHZ manufactured by IBM. It is classified as a MEMORY (RDIMM).
What parts can replace 49Y1561?
There are 4 known substitutes for 49Y1561: 49J0168, 49Y1559, 00KA733 and 1 more. Substitute compatibility should be verified for your specific system.
Is 49Y1561 still available?
49Y1561 is currently Unknown.
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PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.