why does my ddr3 1333mhz ram show up as 400mhz ?

[Matoo69]

why does my ddr3 1333mhz ram show up as 400mhz ? in the bios and cpu z itsay ddr3 400mhz instead of 1333mhz.

i have ASUS P5G41T-M LX

 

[Elysian890]

what CPU do you have?

 

[IdolizeDT]

Well there are 2 things here. DDR stands for double data rate. Therefore, when you run CPU-Z, it will show the speed of the RAM before it is doubled. So right now, your RAM is running at 800MHz effective clock. The first thing I would recommend is to go into the BIOS and check to make sure it is set to 1333Mhz.

 

[Matoo69]

ok i will go to bios,tnx

 

[bignastyid]

On that board by default ram will run at ddr3 800, to get 1333 you need to set the speed in bios.

 

[cin19]

What cpu or RAM do you have?
Because some of RAM will default to run at lowest speed at 800mhz, so you need to overclock the RAM, but it depends on what cpu you had, because the RAM speed related to the CPU (FSB) too.
Check the manual page 2-9. for more details. https://www.asus.com/Motherboards/P5G41TM_LX/HelpDesk/

 

[Matoo69]

a i know now why,fbs is 800 i wait for my q6600 can i then put my ram to 1066mhz?