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Dual channel means two channels of memory. there are two configurations you can use. you can use single channel method which has twoo ram sticks running on one channel or you can have a seperate channel for each ram stick. Dual channel is said to be the better way to run it because it increases speed of the ram. Now assuming you have 4 slots for ram. to use dual channel you have to run 2 sticks of the same value (MB) right next to each other. You cannot run 2 sticks of different values in dual channel mode. In the case that you do the sticks would pair together on a single channel. Hope this helps you better understand.
CPU-Z might mean that your computer is running in "Single" Channel. Running in dual channel mode is slightly faster.
Maybe 5% or a little more. To run dual channel you need 2 sticks of
identical DDR ram. Your PC might have 2 non-identical memory sticks that's why it runs in Single Channel.
I would suggest going with a single piece or 2 identical pieces of RAM for expandability purposes. If you want to upgrade later, you will have the option to add more RAM.
From a cost standpoint, you might be better off buying 2x 2GB sticks as a single 4GB stick of RAM might well exceed the cost of 2x 2GB sticks.
have you checked the bios setup may not be the problem but worth a try My computer recognized dual channel automatically do you have them set in correct Channels as they are specific for dual channel normally labeled 1 2 3 4 etc must put dual channel ram in 1 and 2 channel
1)not all rams are dual compatible
2)did u try both sticks separately? (1 may be damaged)
3)are they exactly the same? CAS, voltage, etc..? Sometimes different CHIPS cause trouble
4)try changing to 333 mhz if it works, go back to 400 and try either CAS 3.0 (assuming auto is 2.5 or lover) if not working yet, try the "T" seeting to "1". If your BIOS doenst show this setting and is AWARD, after getting into it with DEL, press CTRL+F1 and then look which setting came from the dark... (hidden settings) on Gigabyte boards for ex. it has to be done.