RAM: frequency, timmings and density

Lets say we go to the nearest hardware shop and look for some new memory chips.

So we find one, and at specifications we see:

2GB DDR3 1333 Mhz, 9-9-9-27 1.5v

and we are like "what on earth do those number mean?"

Ok let's take it one at a time

the 2 GB, as you probably already know is the density of the chip. That means the said chip can host up to 2048 Megabytes of information, or 2 Gigabytes. this the primary thing we should be looking at when we want new memory chips. The bigger they are, the more info they can store, the more info they store, the more demanding programs we can run.

DDR3 is an abbreviation for double data rate type three. Why type three? well it has to do with the 1333 Mhz you see next to it.
the 3 next to DDR is a frequency multiplier. DDR1 is the basic milestope for frequency.
lets say a DDR1 chip has 400 Mhz frequency. a DDR2 with the same frequency will be considered at 800, and DDR3 and 1200.
the actual frequency of your chip is 444.

the thing to keep in mind is
The higher the frequency, the faster your data transfer is.

9-9-9-27

These are the 4 timing(or latency) numbers.
We won't go into more details here, as the meaning of each number isn't really relevant.
Point is..

The lower the latency numbers, the faster the data transfer is.

1.5v
This is the maximum voltage at which your chips will work properly


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