A system requires enough memory to run several applications at once without a glitch or delay.  And nowadays, laptops come with impressive  memory specifications. Gone are the days when a  laptop meant smaller disk space and a puny RAM. Most top brands offer you the option of choosing the memory you want, as per your requirements. For example, a software engineer or an avid gamer might require 4GB  memory, while for regular home use, 1 GB is usually enough. You can decide how much memory you need depending on the most common computing tasks you perform on your laptop.

Some laptops have inbuilt graphics controllers that use up your available memory. So even though you think you have 1 GB of memory, the actual availability may be much less, with the result that you will find yourlaptop  running slower. In such a case, you might want to upgrade the machine's memory. 

Laptops usually use DDR memory, with the spate of new models running on DDR3. In fact, one must check out memory specifications at the time of purchase of the  laptop, so one wouldn't have to upgrade it anytime soon. Also, find out how many memory modules your  laptop has. Most laptops have two modules, while desktops tend to have about four. This puts a restriction on the maximum possible  memory. So if you want 4GB of memory, you would have to go in for two modules of 2GB each. If you already had 2GB in one module instead of two modules of a GB each, upgrading is much easier. It is possible to install a module yourself. Look for a panel at the bottom of your  laptop. You can just slide in the new memory module and restart yourlaptop for instant results. 

It is helpful to keep in mind that the minimum requirement of RAM is not the most optimum configuration. Ideally, one should have more RAM than is needed for the bare minimum functions. So if you are running games or applications that specify that they require at least 1GB of memory, you'd better have another GB to spare. 
This doesn't mean more is always better. More RAM does not always guarantee better performance. Memoryshould serve to maximise interaction with the computer's memory bus, which is the link between the CPU and the RAM. How much memory is enough—it's a question that has as many answers as there are  laptop users. It is true, however, that for multitasking, which is almost inevitable these days, is best done on a laptopwith a superior  memory. Besides, operating systems like Windows Vista run best on 1GB memory or above.

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