46U1991 — Memory Specs & Substitutes
LENOVO · 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
The 1Gb DDR3 1Rx8 is a LENOVO 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.
SPECIFICATIONS
Part Number 46U1991 Manufacturer LENOVO Interface DDR3 Capacity 1GB
COMPONENT DIAGRAM
ECC
1GB
2Rx4
PC3
—
RDIMM
LENOV
NOTCH
~133.35 mm
DDR3 RDIMM | 1GB | — | PC3
Notch position = DDR3 generation | DDR3/DDR4/DDR5 physically incompatible
RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered
TITLE
DDR3 RDIMM
PN
46U1991
MFR
LENOVO
1GB —
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
No substitute or cross-reference records for this part.
LIFECYCLE
No lifecycle data available.
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FREQUENTLY ASKED QUESTIONS
What is 46U1991?
46U1991 is a 1Gb DDR3 1Rx8 manufactured by LENOVO.
Is 46U1991 still available?
46U1991 is currently Unknown.
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