Asus H81M-K User Manual

1-8
Chapter 1: Product introduction
• 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 conguration. Any excess
memory from the higher-sized channel is then mapped for single-channel operation.
• Due to Intel
®
chipset limitations, DDR3 1600MHz and higher memory modules on
XMP mode will run at the maximum transfer rate of DDR3 1600MHz.
• Always install DIMMs with the same CAS latency. For optimal compatibility, we
recommend that you install memory modules of the same version or date code (D/C)
from the same vendor. Check with the retailer to get the correct memory modules.
• Due to the memory address limitation on 32-bit Windows
®
OS, when you install 4GB
or more memory on the motherboard, the actual usable memory for the OS can be
about 3GB or less. For effective use of memory, we recommend that you do any of the
following:
- Use a maximum of 3GB system memory if you are using a 32-bit Windows
®
OS.
- Install a 64-bit Windows
®
OS if you want to install 4GB or more on the
motherboard.
• This motherboard does not support DIMMs made up of 512 megabits (Mb) chips or
less.
• Memory modules with memory frequency higher than 2133 MHz and its corresponding
timing or the loaded X.M.P. Prole is not the JEDEC memory standard. The stability
and compatibility of these memory modules depend on the CPU’s capabilities and
other installed devices.
• The maximum 16GB memory capacity can be supported with 8GB or above DIMMs.
ASUS will update the memory QVL once the DIMMs are available in the market.
• 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 efcient memory cooling system to support a full
memory load (2 DIMMs) or overclocking condition.
• Refer to
www.asus.com for the latest Memory QVL (Qualied Vendors List)
1.4.3 Installing a DIMM
Unplug the power supply before adding or removing DIMMs or other system components.
Failure to do so can cause severe damage to both the motherboard and the components.
1. Press the retaining clips outward to unlock a DIMM socket.
2. Align a DIMM on the socket such that the notch on the DIMM matches the DIMM slot
key on the socket.

Asus H81M-K Specifications

General

Non-ECC	Yes
Flash memory	64 MB
Memory channels	Dual-channel
Memory slots type	DIMM
Supported memory types	DDR3-SDRAM
Maximum internal memory	16 GB
Supported memory clock speeds	1066, 1333, 1600 MHz
Processor socket	LGA 1150 (Socket H3)
Processor manufacturer	Intel
Compatible processor series	Intel Celeron, Intel Pentium
USB 2.0 connectors	4
Number of EATX power connectors	1
USB 3.2 Gen 1 (3.1 Gen 1) connectors	0
Supported storage drive interfaces	SATA
USB 2.0 ports quantity	2
LAN controller	Realtek 8111G
Ethernet interface type	Gigabit Ethernet
Audio chip	Realtek ALC887
Component for	PC
Power source type	ATX
Motherboard chipset	Intel® H81
Audio output channels	7.1 channels
Motherboard form factor	micro ATX
Maximum resolution	1920 x 1200 pixels
Maximum graphics card memory	1024 MB
Parallel processing technology support	Not supported
BIOS type	UEFI AMI

Weight and Dimensions

Depth	175 mm
Width	226 mm