[jakedavis104]

So I'm getting 4gb and can't decide on which one to get one is, DDR3 1333, and the other is DDR3 1600.(they're the same price)Which one should I get? and could anyone give me a little understanding of the difference? THANK YOU! and sorry for being a noob :/

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The number refers to the speed of the communication the RAM is capable of. It's limited generally by the front side bus speed of the motherboard. Verify that your motherboard supports the speed before choosing which one to purchase, faster is better.

If you are adding an addition stick of memory, I recommend matching speeds on them. Most motherboards can deal with it, but not all and I am still not convinced about it's stability.

I see you have vista listed as your OS. If your processor supports hardware-enforced DEP (here is a list if you are uncertain) you will need to follow these instructions from Microsoft in order to bypass the PAE (Physical Address Extension, a limit in Windows that prevents the OS from seeing more than 3gb correctly.)

[Drix]

The number refers to the speed of the communication the RAM is capable of. It's limited generally by the front side bus speed of the motherboard. Verify that your motherboard supports the speed before choosing which one to purchase, faster is better.

If you are adding an addition stick of memory, I recommend matching speeds on them. Most motherboards can deal with it, but not all and I am still not convinced about it's stability.

I see you have vista listed as your OS. If your processor supports hardware-enforced DEP (here is a list if you are uncertain) you will need to follow these instructions from Microsoft in order to bypass the PAE (Physical Address Extension, a limit in Windows that prevents the OS from seeing more than 3gb correctly.)

[Digerati]

Note the PAE issue if for 32-bit operating systems only. It is not an issue with 64-bit.

[Drix]

Indeed! Nice catch Digerati.