Dell Latitude 5491 Service Manual

Also see for Inspiron 5491: Service manual Setup and specifications guide Setup and specifications Setup and specifications guide Installation guide

Contents

Dell Latitude 5491 Service Manual Manual pdf 8 page image

Technology and componentsThis chapter details the technology and components available in the system.Topics:• Power adapter• DDR4• HDMI 1.4• USB features• USB Type-CPower adapterThis laptop is shipped with 7.4mm barrel plug on 90 W or 130 W power adapter.WARNING: When you disconnect the power adapter cable from the laptop, grasp the connector, not the cable itself, and thenpull firmly but gently to avoid damaging the cable.WARNING: The power adapter works with electrical outlets worldwide. However, power connectors and power strips varyamong countries. Using an incompatible cable or improperly connecting the cable to the power strip or electrical outlet maycause fire or equipment damage.DDR4DDR4 (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.28 Technology and components