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Can't active dual channel mode

Last response: in Motherboards
November 5, 2010 2:03:56 PM

i have inserted 2 stick ram into my asus f5sl laptop. but cpu-z showing that single channel mode. can i know what is problem? is it possible different branded ram? ( asus oem & kingston )
a b Ĉ ASUS
a b V Motherboard
November 5, 2010 3:06:30 PM

You do not activate dual-channel operation. Motherboard does it for you provided that your laptop's motherboard supports dual-channel operation. Different brands and sizes should not matter. Dual-channel maps for the smallest size.
a b Ĉ ASUS
a c 103 V Motherboard
November 5, 2010 5:40:48 PM

Rules to Enable Dual Channel Mode
To achieve Dual Channel mode, the following conditions must be met:

Matched DIMM configuration in each channel
Same Density (128MB, 256MB, 512MB, etc.)
Matched in both Channel A and Channel B memory channels


Populate symmetrical memory slots (Slot 0 or Slot 1)
Configurations that do not match the above conditions will revert to Single Channel mode.

The following conditions do not need to be met:
Same brand
Same timing specifications
Same DDR speed
Memory channel speed is determined by the slowest DIMM module populated in the system.

Related resources
a b Ĉ ASUS
a c 292 V Motherboard
November 5, 2010 5:40:59 PM

Hi malcolm86 and welcome to Tom's forum.

Dual channel only runs with RAM stick of the same amount size even if the brand isn't the same..

Now, we need know better that exactly RAM do u have installed in the mobo and the amount of each one of this.
November 6, 2010 7:00:59 AM

thanks to reply , i inserted 2 sticks of 2gb ram, below is the cpu-z & siw reports. my OS is windows 7 64bit

a b Ĉ ASUS
a b V Motherboard
November 6, 2010 12:08:00 PM

Your motherboard does not support dual-channel, it seems, because full size is shown in cpu-z.