General Characteristics (per JEDEC DDR4 Standard & Samsung)
- Memory Type: DDR4 SDRAM — 4th generation of double data rate memory .
- Voltage: Operates at a low 1.2 V (JEDEC standard, ±0.06 V) Samsung Semiconductor Global Samsung Semiconductor Download .
- Transfer Rates (Speeds):
- Standard speeds range from DDR4-1600 (1600 MT/s) to DDR4-3200 (3200 MT/s).
- Corresponding bandwidths range from ~12.8 GB/s to ~25.6 GB/s
- Samsung modules support up to 3200 Mbps (equivalent to DDR4-3200)
- Internal Architecture:
- Divided into 16 banks, organized as 4 bank groups, enhancing interleaving and performance
- Features include Write CRC, command/address parity, DBI, POD interface, etc., for improved reliability and signal integrity
Typical Module Specs (Samsung UDIMM Examples)
Samsung offers modules in varying capacities and speeds commonly used in desktops:
- Model: M378A1K43CB2-CTD
- Capacity: 8 GB
- Speed: 2666 Mbps
- Voltage: 1.2 V
- Layout: 1R x 8 (single rank)
- Model: M378A5244CB0-CTD
- Capacity: 4 GB
- Speed: 2666 Mbps
- Voltage: 1.2 V
- Also now end-of-life (EOL)
- Model: M378A4G43AB2-CWE
- Capacity: 32 GB
- Speed: 2933 Mbps
- Voltage: 1.2 V
JEDEC DDR4 Timings & Variants
Samsung modules follow JEDEC-defined speed-timing profiles:
