The better solution is to buy more memory. You can buy memory chips in varying memory sizes to suit your needs. They also come in different formats. SIMM's are used in older computers and DIMM's are used in newer computers. It is important to check the documentation that came with your computer in order to buy the right kind. It is also helpful to know your computer model. Also, to add memory, you need an open memory slot. You can check in the documentation how many slots are in your computer. If you've never upgraded, only one will be filled; otherwise, more may be filled. You can open and check if you need to (see installation instructions). If all slots are filled, you will need to remove an old chip and replace it with a larger one (do the math). Here is an example of the info you should have (based on my computer):
Model: G3 Desktop
Open Slots: 2
RAM Specs:
Buying memory online is very easy. All you need is the model name and the # of open slots. Once you have made your purchase, see the installation instructions to install it yourself.
VRAM is used by your computer to display images on your screen. Having more VRAM allows your computer to support more colors and resolutions. Use this program to calculate the amount of VRAM you need to get a specific display. Newer computers (G3's, iMac's) typically come with 2 MB permanently installed and 1 expansion slot that may be empty or filled. This slot can hold either a 2 MB or 4 MB chip (SGRAM SO-DIMM). As with RAM, you should check the documentation that came with your computer before buying.
Check out this article on why you shouldn't install memory into an iMac yourself (too complicated).