ASUS P8B75-M LX Manual Do Utilizador

ASUS P8B75-M LX

1-13

DIMM_A1

DIMM_B1

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

(DIMM) sockets. A DDR3 module has the same physical dimensions as a DDR2 DIMM but 

is notched differently to prevent installation on a DDR2 DIMM socket. DDR3 modules are 

developed for better performance with less power consumption.

The figure illustrates the location of the DDR3 DIMM sockets: 

Channel A

DIMM_A1

Channel B

DIMM_B1

You may install 1GB, 2GB, 4GB and 8GB unbuffered non-ECC DDR3 DIMMs into the DIMM 

sockets.

•  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 2.4 Ai Tweaker menu for manual memory frequency 

adjustment.

•  For system stability, use a more efficient memory cooling system to support a full 

memory load (2 DIMMs) or overclocking condition.

•  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 Intel

®

 3rd generation processors' behavior, DDR3 2250 (and above)/2133/1866 

MHz memory module will run at DDR3 2200/2000/1800 MHz frequency as default.

•  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.

•  This motherboard does not support DIMMs made up of 512Mb (64MB) chips or less.