Owners Manual

Feature/Option DDR3 DDR4 DDR 4 Advantages

Multi-Purpose Register Four Registers – 1 Defined, 3

RFU

Four Registers – 3 Defined, 1

RFU

Provides Additional Specialty

Readout

DIMM Types RDIMM, LRDIMM, UDIMM,

SODIMM

RDIMM, LRDIMM, UDIMM,

SODIMM

DIMM Pins 240 (R, LR, U); 204 (SODIMM) 288 (R, LR, U); 260 (SODIMM)

RAS ECC CRC, Parity, Addressability,

GDM

More RAS features; improved

data integrity

DDR4 Details

There are subtle differences between DDR3 and DDR4 memory modules, as listed below.

Key notch difference

The key notch on a DDR4 module is in a different location from the key notch on a DDR3 module. Both notches are on the insertion edge,

but the notch location on the DDR4 is slightly different, to prevent the module from being installed into an incompatible board or platform.

Figure 1. Notch difference

Increased thickness

DDR4 modules are slightly thicker than DDR3, to accommodate more signal layers.

Figure 2. Thickness difference

Curved edge

DDR4 modules feature a curved edge to help with insertion and alleviate stress on the PCB during memory installation.

Figure 3. Curved edge

Technology and components