Windows 7: Question about ram specification.

Hi guys i saw "6GB Dual Channel DDR3 SDRAM at 1333MHz" on one of dell's laptop specification.
Can anyone explain to me in layman terms what that line mean?
Is it total 6gb @1333mhz? If it is it counted as fast or slow? Sorry i not really good all this things...

Hi shaun166

You stated it right 6gb @ 1333mhz is probably top middle fast, there are better brands and higher clocked ram but that is good ram

There are each ram(like 1 2gb ram) @ 1333mhz right? So if i get 3 2gb ram @1333mhz each compare to this total 6gb only 1333mhz isn't that consider as slow? Correct me if I am wrong....

Yes each stick is 2gb x 3 equals 6gb total @ 1333mhz, No that is not considered slow, slow was back when you had 800mhz ram in todays standards

Dual channel means that two DIMMs are accessed in parallel, doubling the (theoretical) bandwidth.

I believe that 1333 MHz is the fastest standard specification. There is memory available with higher clocks, but it's outside the standard. (That's true for Intel motherboards. I don't know if it's the same for AMD.) I doubt that most laptops would have the BIOS adjustments needed to set the RAM to higher frequencies.

6GB is a peculiar number. DIMMs are usally made in powers of 2, so that usual capacities are 1, 2, and 4 GB. To get 6 GB dual channel, that suggests two 2 GB plus two 1 GB DIMMs.

So you mean each stick of ram is 1333 divide by 3=444.3mhz?

Ok lets say i have 3 sticks of ram. All 2gb each @1333Mhz(I don't know got such thing exist anot) then total is 6gb right. The total Mhz is 1333x3?

Your making this way to hard for yourself, think of it as seperate things, 6gb's of ram and they all run at 1333mhz, i have 8gb's @ 1600mhz

Because I use CPUz then they show me that my com currently 4gb ram. 2gb@666mhz and 2gb @ 666mhz. Total add up to 1333mhz. Hence, I feel that separate will more easy to understand. Thanks for your huge help!

It's double data rate (DDR) ram. Thus, 667 x 2 = 1333mhz.

Using the older Intel Core 2 Duo or Core 2 Quad chips and the FSB lecture goes like this.

A Core 2 Duo E8400 CPU runs at 3.0ghz by default. It's a 333Mhz Front Side Bus chip, with an 9x multiplier. So, 333x9 = 2997.

Ram in these machines is also based off the front side bus speed of 333Mhz...but when you take into account the double data rate, that becomes 333 x 2 = 667. Thus, when you look at the standard RAM for a Core 2 Duo E8400 it's set to run with DDR2-667 RAM.

Now, if you want to overclock your E8400, most people will raise the Front Side bus speed to something like 400. So, with a 9x multipler, you get 9 x 400 = 3600Mhz. With the RAM, you get 400 x 2 or 800Mhz. So, to run this type of overclock, you really need DDR2-800 RAM installed...

Hopefully that makes some sense.