Check Memory (RAM)

Along with the processor, the amount of random access memory (RAM), or simply memory for short, greatly influences your PC’s performance. Rather than a shortage component like a hard drive, RAM (Figure 1.13 shows an example) is used when the information needs to be quickly read or written, such as temporarily storing information when running software applications.
You need to make sure your PC is loaded with adequate memory because Windows Vista requires much more memory than Windows XP. You’re probably good to go if you’ve purchased your system within the last few years; however, if more memory is required or recommended, you can easily add more, which is actually just about the easiest hardware system upgrade you can perform while providing a great enhancement.
To determine how much RAM you have in your system, follow the same steps outlined in #3, “Check the Processor (CPU).” The amount of RAM is shown in the same dialog box showing CPU type and speed.
Here are a few tips if you want to add more memory:
Check how many untaken and total memory slots are in your PC by peeking inside your computer.
Most PCs have two or three memory slots located on the motherboard in plain sight.
Check the maximum amount of memory supported for your system by referring to your PC’s product documentation or manuals.
Find memory that’s compatible with your specific system, which is also likely found in your PC’s documentation or manuals.
You can use online tools, such as the System Scanner (www.crucial.com/systemscanner), which will scan your system and let you know exactly what memory is compatible with your particular system; using this method eliminates manually inspecting your PC and figuring out all the specifics of your system.