What exactly is computer memory?

Most computer users are confused between the two types of computer memory. There is the one type of memory that if you increase it’s capacity, you get a dramatic performance boost. Then there is the other type of memory where if you increase that capacity, you get to store a lot more music, photos, videos, and the like. I sometimes get questions like “Will adding all of my photos from my camera onto my computer slow it down?” The answer to that question is no and I will explain why below.

There are two types of computer “memory”. There is RAM (or Random Access Memory) of which the operating system and programs you see on your computer’s screen resides in and there is hard disk drive storage memory. RAM is the “fast” type of memory. This memory works so fast that its speed is measured in nanoseconds. Hard disk drives are the “slow” type of memory. This memory is so slow that its speed is measured in milliseconds. Hard disk drive storage is in the hundreds of gigabytes and it is a permanent storage medium for all your computer’s data (operating system, pictures, music, documents, etc). This type of memory should be thought of as “storage” rather than “memory” because that’s where the terminology can get confusing for some users. The real type of computer “memory” is RAM and it’s the kind that runs all of your programs in real-time until you turn off your computer. That’s why computers take a long time to boot up because it has to pull all the programs off the slow hard disk drive back into fast RAM before you’re able to work on the computer. RAM is volatile memory – all your stuff disappears as soon as the power is turned off.

Now here’s where things get interesting. If you try to load so many programs at once to multitask in, or play a very resource intensive game, database application, or CAD type of program, your computer might actually run out of its fast RAM type of memory. Then guess what happens? It has to use the slower hard drive for additional memory! This is called paging or swapping. It will take those unused running applications that are usually in the background or minimized on your task bar and put those onto the hard disk drive in order to free up RAM for the newly launched application. This is why one of the BEST things you can do to speed up your computer is to add more RAM. For Windows XP, I recommend no less than 2 gigabytes of RAM for today’s common applications. For Windows Vista, I recommend no less than 4 gigabytes of RAM. For the upcoming Windows 7, we will be able to run a very efficient computer with only 2 gigabytes of memory again, just like Windows XP, because Microsoft has really scaled back all the “bloat” that plagues Vista.

So, if you find that launching multiple windows on your screen is very slow, then you just might need a RAM upgrade. Feel free to contact me for a free evaluation of your computer and its RAM upgradeability.