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Dell Vostro 3267/3268 Owner's Manual

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DDR4

DDR4 (double data rate fourth generation) memory is a higher-speed successor to the DDR2 and DDR3 technologies and allows up to 512 GB in capacity, compared to the DDR3's maximum capacity of 128 GB per DIMM. DDR4 synchronous dynamic random-access memory is keyed differently from both SDRAM and DDR to prevent the user from installing the wrong type of memory into the system.

DDR4 needs 20 percent less or just 1.2 volts, compared to DDR3 which requires 1.5 volts of electrical power to operate. DDR4 also supports a new, deep power-down mode that allows the host device to go into standby without needing to refresh its memory. Deep power-down mode is expected to reduce standby power consumption by 40 to 50 percent.

Key Specifications

The following table lists the specifications' comparison between DDR3 and DDR4:

Table 1. DDR3 vs DDR4This table describes you comparison between DDR3 vs DDR4

Feature/Option

DDR3

DDR4

DDR 4 Advantages

Chip Densities512 Mb-8 Gb4 Gb-16 GbLarger DIMM capacities
Data rates800 Mb/s-2133 Mb/s1600 Mb/s-3200 Mb/sMigration to higher speed I/O
Voltage1.5 V1.2 VReduced memory power demand
Low voltage standardYes (DDR3L at 1.35V)Anticipated at 1.05VMemory Power Reductions

Internal banks

8

16

Higher data rates

Bank groups (BG)

0

4

Faster burst accesses

VREF inputs2 —DQs and CMD/ADDR1 — CMD/ADDRVREFDQ Now Internal
tCK — DLL Enabled300 Mhz-800 Mhz667Mhz-1.6GhzHigher data rates
tCK — DLL Disabled10MHz – 125MHz (optional)Undefined to 125MHzDLL-off now fully supported
Read LatencyAL+CLAL+CLExpanded values
Write LatencyAL+CWLAL+CWLExpanded values
DQ Driver (ALT)40&Omega48&OmegaOptimal for PtP Applications
DQ BusSSTL15POD12Less I/O Noise and Power
RTT Values (in &Omega)120,60,40,30,20240,120,80,60,48,40,34Support for higher data rates
RTT not allowedREAD BurstsDisables during READ BurstsEase of use
ODT ModesNominal, DynamicNominal, Dynamic,ParkAdd’l Control Mode; OTF Value Change
ODT ControlODT Signaling RequiredODT Signaling Not RequiredEase of ODT Control; Allows Non-ODT Routing, PtP Apps
Multi-Purpose RegisterFour Registers – 1 Defined, 3 RFUFour Registers – 3 Defined, 1 RFUProvides Additional Specialty Readout
DIMM TypesRDIMM, LRDIMM, UDIMM, SODIMMRDIMM, LRDIMM, UDIMM, SODIMM
DIMM Pins240 (R, LR, U); 204 (SODIMM)288 (R, LR, U); 260 (SODIMM)
RASECCCRC, Parity, Addressability, GDMMore 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
Image: Notch difference
Increased thickness
DDR4 modules are slightly thicker than DDR3, to accommodate more signal layers.
Figure 2. Thickness difference
Image: 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
Image: Curved edge

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