Asus P9X79 User Manual

2-6 Chapter 2: Hardware information
Chapter 2
Memory congurations
You may install 1GB, 2GB, 4GB, and 8GB unbuffered, and non-ECC DDR3 DIMMs into the
DIMM sockets.
• You may install varying memory sizes in Channel A, B, C, and D. The system maps
the total size of the lower-sized channel for the dual-channel, triple-channel, or quad-
channel conguration. Any excess memory from the higher-sized channel is then
mapped for single-channel operation.
• Due to CPU behavior, DDR3 2200/2000/1800 MHz memory module will run at DDR3
2133/1866/1600 MHz frequency as default.
• According to Intel
®
spec, the max. 64GB memory capacity can be supported with
DIMMs of 8GB (or above). ASUS will update QVL once the DIMMs are available on
the market.
• According to Intel CPU spec, DIMM voltage below 1.65V is recommended to protect
the CPU.
• Always install DIMMs with the same CAS latency. For optimum compatibility, we
recommend that you obtain memory modules from the same vendor.
• 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 when you want to install 4GB or more on the
motherboard. However, there are differences in memory support specications on
64-bit Windows OS.
For more details, refer to the Microsoft
®
support site at
http://support.microsoft.com/kb/929605/en-us.
• This motherboard does not support DIMMs made up of 512Mb (64MB) 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. To operate at the vendor-marked
or at a higher frequency, refer to section
3.4 Ai Tweaker menu
for manual memory
frequency adjustment.
• For system stability, use a more efcient memory cooling system to support a full
memory load (4 DIMMs or above) or overclocking condition.

Asus P9X79 Specifications

General

Non-ECC	Yes
Memory channels	Quad-channel
Number of memory slots	8
Supported memory types	DDR3-SDRAM
Maximum internal memory	64 GB
Supported memory clock speeds	1066, 1333, 1600, 1866, 2133, 2400 MHz
Processor socket	LGA 2011 (Socket R)
Processor manufacturer	Intel
Compatible processor series	Intel® Core™ i7
Maximum number of SMP processors	1
USB 2.0 connectors	4
Number of SATA III connectors	2
Number of Parallel ATA connectors	0
USB 2.0 ports quantity	6
Audio chip	Realtek ALC892
Component for	PC
Audio output channels	7.1 channels
Motherboard form factor	ATX
RAID levels	0, 1, 5, 10
Supported storage drive interfaces	SATA II, SATA III
On-board graphics card	No
Parallel processing technology support	Quad-GPU CrossFireX, Quad-GPU SLI
PCI Express x16 slots	3
PCI Express slots version	3.0
Controller interface type	Intel X79
Controller 2nd interface type	ASMedia ASM1061
Trial software	Anti-virus
Bundled software	ASUS Utilities ASUS Update
LAN controller	Intel® 82579V
Ethernet interface type	Gigabit Ethernet
BIOS type	UEFI
ACPI version	2.0a
BIOS memory size	64 Mbit

Weight and Dimensions

Depth	244 mm
Width	305 mm