GIGABYTE Z790 UD AC LGA 1700 ATX Motherboard - Manual (Page 15)

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2-4 Installing the Memory
Read the following guidelines before you begin to install the memory:
• Make sure that the motherboard supports the memory. It is recommended that memory of the same
capacity, brand, speed, and chips be used. (Go to GIGABYTE's website for the latest supported
memory speeds and memory modules.)
• Always turn off the computer and unplug the power cord from the power outlet before installing the
memory to prevent hardware damage.
• Memory modules have a foolproof design. A memory module can be installed in only one direction.
If you are unable to insert the memory, switch the direction.
j
Only for Z790 UD AX.
k
Only for Z790 UD AC.
l
Only for Z790 UD.
m
Only for Z790 D DDR4.
Dual Channel Memory Configuration
This motherboard provides four memory sockets and supports Dual Channel Technology. After the memory
is installed, the BIOS will automatically detect the specifications and capacity of the memory. Enabling Dual
Channel memory mode will double the original memory bandwidth.
The four memory sockets are divided into two channels and each channel has two memory sockets as following:
Channel A: DDR5_A1
jkl
/DDR4_A1
m
, DDR5_A2
jkl
/DDR4_A2
m
Channel A: DDR5_B1
jkl
/DDR4_B1
m
, DDR5_B2
jkl
/DDR4_B2
m
* Recommended Dual Channel Memory Configuration:
DDR5_A1 jkl
DDR4_A1 m
DDR5_A2 jkl
DDR4_A2 m
DDR5_B1 jkl
DDR4_B1 m
DDR5_B2 jkl
DDR4_B2 m
Two Modules - - DS/SS - - DS/SS
4 Modules DS/SS DS/SS DS/SS DS/SS
(SS=Single-Sided, DS=Double-Sided, "- -"=No Memory)
Due to CPU limitations, read the following guidelines before installing the memory in Dual Channel mode.
1. Dual Channel mode cannot be enabled if only one memory module is installed.
2. When enabling Dual Channel mode with two or four memory modules, it is recommended that memory of
the same capacity, brand, speed, and chips be used.
When installing a single memory module, we recommend that you install it in the
DDR5_A2
jkl
/DDR4_A2
m
socket.
DDR5_A1 jkl /DDR4_A1 m
DDR5_A2 jkl /DDR4_A2 m
DDR5_B1 jkl /DDR4_B1 m
DDR5_B2 jkl /DDR4_B2 m