Memory
The memory slots on the system board can be populated with up to two industry-standard small outline dual
inline memory modules (SODIMMs). These memory slots are populated with at least one preinstalled memory
module. A metal shield protects the memory modules.
For proper system operation, the memory modules must meet the following qualications:
Component Specication
Memory modules 1.2 volt DDR4-SDRAM memory modules
Compliance Unbuered non-ECC DDR4-2666 MHz SODIMM compliant
Pins Industry-standard 260 pins containing the mandatory Joint Electronic Device
Engineering Council (JEDEC) specication
Support Support CAS latency 19 DDR4 2666 MHz (19-19-19 timing)
Slots 2
Maximum Memory 16 GB per memory slot, 32 GB total
Supported 8 Gbit (base) non-ECC memory technologies single-sided and double-sided SODIMMs
Note The system will not operate properly if you install unsupported SODIMM
memory. SODIMMs constructed with x8 and x16 DDR devices are supported; memory
modules constructed with x4 SDRAM are not supported.
The system will automatically operate in single channel mode, dual channel mode, or ex mode, depending
on how the memory modules are installed. Refer to the following table to identify the memory module
channel locations.
Location System board label Channel
Lower Socket SODIMM1 Channel B
Upper Socket SODIMM3 Channel A
The system will automatically operate in single channel mode, dual channel mode, or ex mode, depending
on how the memory modules are installed.
● The system will operate in single channel mode if the memory module slots are populated in one
channel only.
● The system will operate in a higher-performing dual channel mode if the memory capacity of the
memory module in Channel A is equal to the memory capacity of the memory module in Channel B.
● The system will operate in ex mode if the memory capacity of the memory module in Channel A is not
equal to the memory capacity of the memory module in Channel B. In ex mode, the channel populated
with the least amount of memory describes the total amount of memory assigned to dual channel and
the remainder is assigned to single channel. If one channel will have more memory than the other, the
larger amount should be assigned to channel A.
● In any mode, the maximum operational speed is determined by the slowest memory module in the
system.
30 Chapter 4 Removal and Replacement Procedures
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