It largely depends on what you'll be doing, if you're going to be doing tasks such as Adobe Creative Suit, then yes, lots of RAM is usually important. On the other hand, web browsing requires much less ram. It all depends on how heavy the activity on your computer is going to be, and what you will be doing, and depending on that your RAM should be around 4-20 gig's.
if the computer has a low amount of RAM that can cause lots of crashes
Yes, RAM is important because it eliminates the need to "swap" programs in and out.
Generally Mac and PC types of RAM are incompatible, so your best bet would be in shopping for RAM advertised as compatible with your Apple computer.
It is faster to access RAM than the Hard Drive in a computer, this is why lots of RAM is good, as the computer can store more data on it that is being used so it can be accessed and thus run faster.
If you think of your hard drive as a library then the RAM is the librarians. The more you have the faster you can retrieve the information you require from your hard drive. If you are running lots of programmes on your computer at the same time then you need lots of RAM (Random Access Memory) it is cheaply bought and will help your computer run faster.
Random Acces Memory is a very important part of the mechanics of the computer. You increase it by obtaining a higher capacity ram stick of the same type your computer uses.
RAM
Yes. A fast CPU is important to how games are played on a computer. More important than the CPU are the amount of RAM in a computer and the video card. You could make do with a less powerful CPU with more RAM and a great video card.
On the computer ad, you'd be looking for at least 2-3 gigabytes of ram. Nowadays, 2gb is considered minimal. If you don't want to buy a new computer, ram extensions are also available and can be inserted into the computer to increase memory by a certain amount.
RAM speed is how fast your computer goes. The more RAM, the faster your computer.
RAM ( random access memory)
The amount of RAM depends on the computer.