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Most desktop systems shipped with the memory that was sufficient at the time of purchase, but as computer programs get more complex, they use up more system RAM.
Memory upgrades vary in cost depending upon factors such as the type of memory that your computer system uses and the amount that you intend to purchase.
There's no hard-and-fast rule about when you should upgrade a computer versus replacing it outright.
One consideration is whether the computer is conveniently upgradeable.
The more memory that a PC has, the more data it can process without having to use virtual memory.
Virtual memory is memory that exceeds the system RAM and is swapped to and from the hard drive in order to keep the system running.
The amount of performance that you might need from a graphics card will vary greatly depending upon your tasks.
Optical drives prove increasingly rare in modern computers given the general transition to streaming media and USB flash drives, but there are still compelling use cases for these drives.Even then, you may be restricted by the computer's motherboard as to what processors you can install in the system.If your motherboard is too old, a processor replacement may also require the motherboard and memory to be upgraded as well which can get into the same realm as buying a whole new computer.In most cases, swapping memory chips is one of the easiest hardware updates you can make.
Check, first, whether your computer is affected by the 4GB memory limit in 32-bit operating systems.Most graphics cards require on-board power, so check what your existing power supply can support before searching for a card.