Dual-Channel DDR3 2400 (O.C.)/ 2133 (O.C.)/ 1866 (O.C.)/ 1600/1333/1066 Support

The motherboard supports DDR3 memory that features data transfer rates of 2400 (O.C.)/ 2133 (O.C.)/ 1866 (O.C.)/ 1600/ 1333/ 1066 MHz to meet the higher bandwidth requirements of the latest 3D graphics, multimedia, and Internet applications. The dual-channel DDR3 architecture enlarges the bandwidth of your system memory to boost system performance. Refer to page NN for details.

 

 

I. HARDWARE INFORMATION

Central Processing Unit (CPU)

 

The motherboard comes with a surface mount LGA 1155 socket designed for the Intel® 2^nd Generation Core™ i7/ Core™ i5/ Core™ i3 Processors.

 

! Ensure that all power cables are unplugged before installing the CPU.

 

· The LGA1156 CPU is incompatible with the LGA1155 socket. DO NOT install a LGA 1156 CPU on the LGA 1155 socket.

 

· Upon purchase of the motherboard, ensure that the PnP cap is on the socket and the socket contacts are not bent. Contact your retailer immediately  if the PnP cap is missing, or if you see any damage to the PnP cap/socket contacts/motherboard components. ASUS will shoulder the cost of repair only if the damage is shipment/transit-related.

 

· Keep the cap after installing the motherboard. ASUS will process Return Merchandise Authorization (RMA) requests only if the mother-board comes with the cap on the LGA1155 socket.

 

· The product warrantydoes not cover damage to the socket contacts resulting from incorrect CPU installation/removal, or misplacement/ loss/incorrect removal of the PnP cap.

 

System memory

The motherboard comes with four Double Data Rate 3 (DDR3) Dual Inline Memory Modules (DIMM) slots.

 

! A DDR3 module is notched differently from a DDR or DDR2 module.

   DO NOT install a DDR or DDR2 memory module to the DDR3 slot.

 

 

Memory configurations

You may install 1GB, 2GB and 4GB unbuffered and non-ECC DDR3 DIMMs into DIMM sockets.

 

· 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 access memory from the higher-sized channel is then mapped for single-channel operation.

 

· The max. 32GB memory capacitycan 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.

 

· 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.

· 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  NNN  for  manual  memory frequency adjustment.

 

· For system stability, use a more efficient memory cooling system to support a full memory load (4DIMMs) or overclocking condition.

 

 

Onboard LEDs

The  motherboard  comes  with  a set  of  LEDs  that  indicate  the  voltage conditions of CPU, memory, northbridge and southbridge. You may adjust the voltages in BIOS. There are also an LED for hard disk drive activity and an onboard switch for power status.

 

CPU LED

The CPU LED has four voltage displays: CPU Voltage, VCCSA, VCCIO and CPU PLL Voltage; you can select the voltage to display in BIOS.

 

Memory LED

The Memory  LED  has  one  voltage  display:  DRAM Voltage.  Refer to the illustration below for the location of the memory LED and the table below for LED definition.

 

Hard Disk LED

 

The hard  disk LED  is designed  to indicate  the hard disk activity. It blinks when data is being written  into or read from the hard disk drive. The LED does not light up when there is no hard disk drive connected to the mother-board or when the hard disk drive does not function.

 

BIOS LED

 

The BIOS LEDs help indicate the BIOS activity. Press the BIOS button to switch between BIOS1 and BIOS2 and the LED lights up when the corresponding BIOS is in use.

GO LED

 

Blinking: Indicates that Mem OK! Is enabled before POST.

 

Lighting: Indicates that the system loads the preset profile (GO_Button file)   

          for temporary overclocking when in OS.

 

POWER LED

 

The motherboard comes with a power-on switch that lights up to indicate that the system is ON, in sleep mode, or in soft-off mode. This is reminder that you should shut down the system and unplug the power cable before removing or plugging in any motherboard component.

 

 

Jumper

Clear RTC RAM (3-pin CLRTC)

 

This jumper allows you to clear the Real Time Clock (RTC) RAM in CMOS. You can clear the CMOS memory of date, time, and system setup parameters by erasing the CMOS RTC RAM data. The onboard button cell battery powers the RAM data in CMOS, which include system setup information such as system passwords.

 

To erase the RTC RAM

1.  Turn OFF the computer and unplug the power cord.

2. Move the jumper cap from pins 1-2 (default) to pins 2-3. Keep the cap on pins 2-3 for about 5-10 seconds, then move the cap back to pins

1-2.

3. Plug the power cord and turn ON the computer.

4. Hold down the <Del> key during the boot process and enter BIOS setup to reenter data.

 

Except when clearing the RTC RAM, never remove the cap on CLRTC  

 ! jumper default position. Removing the cap will cause system boot

failure!

 

· If the steps above do not help, remove the onboard battery and move the jumper again to clear the CMOS RTC RAM data. After the CMOS clearance, reinstall the battery.

· You do not need to clear the RTC when the system hangs due to overclocking. For system failure due to overclocking, use the C.P.R. (CPU Parameter Recall) feature. Shut down and reboot the system so the BIOS can automatically reset parameter settings to default values.

· Due to the chipset behavior, AC power off is required to enable C.P.R. function. You must turn off and on the power supply or unplug and plug the power cord before rebooting the system.

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