dear friend, I think you are confused with 2GB hard disc space and 2GB RAM...
In a 2gb ddr ram, there are 2097153 kbs. It is already an excellent memory choice for the diverse needs of many applications, from automotive to industrial to server.
2147483648 bytes
You can install 2-1GB sticks or 1-2GB stick. The comp won't use more than 2GB total.
It should be as large is your RAM amount. If you have 2Gb of RAM the paging file has to be about 2GB too.
The RAM is 2GB
sure you can
There are many different desktops that are compatible with the 2GB DDR2 RAM. Some desktops that are compatible with this ram include the Dell 530 and Dell 531S models. You can get more information about DDR2 SDRAM at the Wikipedia.
At least 2GB of RAM is needed (2048MB)
Typically, almost all laptops & PCs have atleast 1GB of RAM. With better & faster operating systems coming out, there are lots of computers with 2GB RAM and more.
A motherboard's max RAM refers to how much TOTAL RAM it can handle. If it says the max is 2 GB than you would install two 1GB modules OR a single 2GB module.
not nessesarily. it depends on what needs that much RAM
Yes. It depends on how much you have already, and what is the size of the working set. The working set is the amount of "most recently used ram". (Amongst processes that are actively using the CPU.) If this amount is less than available ram, you are going to have excessive swap activity, which (using the disk) is very, very, very much slower than ram. If you already have 2gb of ram, then adding 2gb of ram will boost performance somewhat. If you already have only 256mb ram, then adding 2gb of ram will boost performance dramatically.