Dell Latitude 3490 Owners Manual - Page 74

Technology and components, Power adapter, DDR4, DDR4 Details - laptop

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4 Technology and components This chapter details the technology and components available in the system. Topics: • Power adapter • DDR4 • USB features • HDMI 1.4 • USB Type-C Power adapter This laptop is shipped with 4.5 mm barrel plug on power adapter. WARNING: When you disconnect the power adapter cable from the laptop, grasp the connector, not the cable itself, and then pull firmly but gently to avoid damaging the cable. WARNING: The power adapter works with electrical outlets worldwide. However, power connectors and power strips vary among countries. Using an incompatible cable or improperly connecting the cable to the power strip or electrical outlet may cause fire or equipment damage. 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 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. 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. 74 Technology and components

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Technology and components
This chapter details the technology and components available in the system.
Topics:
•
Power adapter
•
DDR4
•
USB features
•
HDMI 1.4
•
USB Type-C
Power adapter
This laptop is shipped with 4.5 mm barrel plug on power adapter.
WARNING:
When you disconnect the power adapter cable from the laptop, grasp the connector, not the cable itself, and then
pull
firmly
but gently to avoid damaging the cable.
WARNING:
The power adapter works with electrical outlets worldwide. However, power connectors and power strips vary
among countries. Using an incompatible cable or improperly connecting the cable to the power strip or electrical outlet may
cause
fire
or equipment damage.
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 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.
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.
4
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Technology and components