CPU and RAM useful ==add RAM

the ram need too big , is it can accletate you computer , the awswer is not sure ,

if you use IO sysetem is frenquently , it will not useful ,if you computer just compute some programm  or

just do some background work , it can do it ,

if you use IO time is 80%, then you will use you 20% time  to calaclute  the programm ,

and if you use five process in ram , 

the computer rate mode is :

 

CPU rate= 1-p(n);