DDR4 Memory Technology

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DDR4 is the latest memory technology available for main memory on mobile,

desktops, workstations, and server computers. DDR stands for Double Data Rate,

which transfers data on both the rising and falling edges of the clock signal.

DDR4 supports higher speeds and bandwidths than its predecessor DDR3 and

enables signicant power savings. Also, with the introduction of three

dimensional stacking, it can support higher density DIMMs. It is not forward or

backward compatible with any other type of RAM. DDR4 is supported on the

HP Z1 G3, HP Z240, HP Z440, HP Z640, and HP Z840 Workstations.

Table of contents

DDR4 Interface...............................................................................................................................................................2

Memory Module makeup..............................................................................................................................................2

DRAM characteristics....................................................................................................................................................2

ECC protection................................................................................................................................................................2

Ranks...............................................................................................................................................................................2

DDR4 Memory Module tyes..........................................................................................................................................2

Current available DIMM type support table................................................................................................................4

Memory Module capacity calculation..........................................................................................................................4

Label decoder.................................................................................................................................................................4

Learn more.....................................................................................................................................................................5

Technical white paper

DDR4 Memory Technology on

HP Z Workstations

Summary of content (5 pages)

PAGE 1
Technical white paper DDR4 Memory Technology on HP Z Workstations DDR4 is the latest memory technology available for main memory on mobile, desktops, workstations, and server computers. DDR stands for Double Data Rate, which transfers data on both the rising and falling edges of the clock signal. DDR4 supports higher speeds and bandwidths than its predecessor DDR3 and enables significant power savings. Also, with the introduction of three dimensional stacking, it can support higher density DIMMs.
PAGE 2
Technical white paper | DDR4 Memory Technology on HP Z Workstations DDR4 Interface The DDR4 memory interface connects the Dual In-line Memory Module (DIMM) to the CPU and consists of address/ command and data bus groups. The data bus group is comprised of 64 bits on non-ECC systems and 72 bits on processors and systems that support ECC memory.
PAGE 3
Technical white paper | DDR4 Memory Technology on HP Z Workstations Registered DIMMs (RDIMMs) use registers to buffer the command and address signals, as shown in the figure below. The data bits are not buffered. All RDIMMs support ECC as well as parity protection on the command and address signals. RDIMMs should be used for higher reliability and for cost savings on higher capacities.
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Technical white paper | DDR4 Memory Technology on HP Z Workstations Current available DIMM type support table Unbuffered Non ECC Unbuffered ECC Registered LR DIMM Single rank X X X Dual rank X X X X X X Quad rank Octal rank X 16 bit width DRAMs (x16) X 8 bit width DRAMs (x8) X X 4 bit width DRAMs (x4) ECC data protection on data Parity protection on Command/Address X X X X X X X X X X X X Buffered Command/ Address/Clk Buffered data X 3DS Technology X Memory Module capa
PAGE 5
Technical white paper | DDR4 Memory Technology on HP Z Workstations • ff = Device organisation (data bid width, e.g. x4, x8, x16) • PC4v = Indicates that this is a DDR4 module and the supported component supply voltage –– PC4 = operates at 1.