You people sound so dumb. The ram and memory don't have anything to do with the processing power of your computer. If you run a game, then some of the processor is being used to open the game, play the game, and other stuff like that. This will indeed slow down the computer but if you don't have it open then the processor won't be processing anything and the computer will be faster.
Ex: You can write ten papers a minute. If your boss wants you to write seven papers then you can do it. Now say he has you doing multiple things, then you will slow down because you are doing more things at once. You may not be able to complete all your work on time because you got so many things to do.
If your computer doesn't have a good processor then you may not be able to play the game correctly. You have to check the requirements for the game. If the game requires a 1GHz Processor and you have a 700MHz processor then you can play it but it will be slow. On the other hand, if you have a 2GHz processor then you will be able to play without a problem and maybe do other things as well. Just make sure you have space for the game.
Yes, I have heard people ask me that same question, "If I don't have alot of memory, will my computer slow down?" Well you heard it from me, no it will not affect the processing performance. I don't care if your hard drive is full. You people don't know what you are talking about.
I also forgot, If your computer is slow and you don't have anything open then guess what, you got spy-ware. You have to get programs that will remove it because spy-ware takes up some of the processors power in sending info on the net. This is why people ask me the above question.