Memory is very much essential in the laptop, as more is the memory, better the system will work. Some parts like memory and hard drives are the items that are interchangeable or up gradation of memory can be done according to the need of the person. The restrictions are there in case of memory that can be installed into a system. Most commonly used memory is as follows: Minimum - 500 and 12 MB, Recommended - One GB, Optimum - Two GB and the Best - More than Two GB. These ranges are generally used for most common computing tasks. To make a final decision it is required to check the future software.
The memory slots given are not precise as they vary from many operating systems as more memory is used by some people. Many laptop users use graphic controllers which occupy a certain portion of general memory for the graphics. This will automatically reduce the memory capacity in the system. To compensate on this, it is better to opt for laptop with more memory. RAM is known as Random Access Memory and it is the primary working memory in the system used to store temporary programs and data's which can be accessed directly and also personalized or modified.
There are different types of memory and they have their own specifications or conditions. Mostly DDR Two memory specification is used in new systems nowadays, but some laptops do come with older DDR type memory. This won't be for a long term, as now the next model of system which has been started with DDR Three type memory. Not only the memory type determines the system level, but also the speeds of memory play a vital role in this part.
Before buying a laptop check and make sure with the speed of the memory also. There are two ways that the memory speeds can be chosen; the first is by memory type and clock rating and second is by listing the type of memory. Laptop in general has two slots of memory modules compared to four or more in the desktop system. There are some systems available in the markets which do not have the facility of changing the size of memory this is known as Memory Restrictions. So check with that before the purchase.
Most important aspect to be considered at the time of purchase of laptop is to know the maximum amount of its memory and this is almost specified by all the manufacturers. This will help to know the upgrading potential of the system and next is to know about the memory configuration of the system. The system with single memory module will allow for a better upgrade potential, so that by adding some more modules the system can gain more memory as well as the current memory will exist. Nowadays most of the laptops have a small opening on the underside with access to the memory module slots, which will help the user to just purchase and install a memory up gradation. To increase the overall performance of the laptop it is better to upgrade the memory.
The buyers' guides - http://www.laptopmall.info and http://www.bestusedcomputers.info - have exhaustive resources for computers, laptops and the other related accessories.
