Dell Latitude 3480 Owner's Manual

Also see for Inspiron 3580: Owner's manual Service manual Owner's manual Owner's manual Technical guidebook

Contents

Dell Latitude 3480 Owner's Manual Manual pdf 33 page image

• PC screen only• Duplicate• Extend• Second Screen onlyDDR4DDR4 (double data rate fourth generation) memory is a higher-speed successor to the DDR2 and DDR3 technologies and allows up to 512GB in capacity, compared to the DDR3's maximum of 128 GB per DIMM. DDR4 synchronous dynamic random-access memory is keyeddifferently 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 supportsa new, deep power-down mode that allows the host device to go into standby without needing to refresh its memory. Deep power-downmode is expected to reduce standby power consumption by 40 to 50 percent.DDR4 DetailsThere are subtle differences between DDR3 and DDR4 memory modules, as listed below.Key notch differenceThe 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 edgebut 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 differenceIncreased thicknessDDR4 modules are slightly thicker than DDR3, to accommodate more signal layers.Figure 2. Thickness differenceCurved edgeDDR4 modules feature a curved edge to help with insertion and alleviate stress on the PCB during memory installation.Technology and components 33