Asus PRIME Z270-AR Series Manual page 22

Memory configurations
You may install 1 GB, 2 GB, 4 GB, 8 GB and 16 GB unbuffered and non-ECC DDR4 DIMMs
into the DIMM sockets.
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1-6
You may install varying memory sizes in Channel A and Channel B. The system
maps the total size of the lower-sized channel for the dual-channel configuration. Any
excess memory from the higher-sized channel is then mapped for single-channel
operation.
Due to the memory address limitation on 32-bit Windows
or more memory on the motherboard, the actual usable memory for the OS can be
about 3 GB or less. For effective use of memory, we recommend that you do any of
the following:
a) Use a maximum of 3GB system memory if you are using a 32-bit Windows
b) Install a 64-bit Windows
motherboard.
c) For more details, refer to the Microsoft
com/kb/929605/en-us.
This motherboard does not support DIMMs made up of 512 Mb (64 MB) chips or less
(Memory chip capacity counts in Megabit, 8 Megabit/Mb = 1 Megabyte/MB).
The default memory operation frequency is dependent on its Serial Presence Detect
(SPD), which is the standard way of accessing information from a memory module.
Under the default state, some memory modules for overclocking may operate at a
lower frequency than the vendor-marked value.
For system stability, use a more efficient memory cooling system to support a full
memory load (4 DIMMs) or overclocking condition.
Always install the DIMMS with the same CAS Latency. For an optimum compatibility,
we recommend that you install memory modules of the same version or data code
(D/C) from the same vendor. Check with the vendor to get the correct memory
modules.
OS when you want to install 4 GB or more on the
®
support site at http://support.microsoft.
®
Chapter 1: Product Introduction
OS, when you install 4 GB
®
OS.
®