More often it is the motherboard which determines the Memory which can be in a PC.
cpu
chipset
You can open task manager by pressing control alt Delete (not backspace) and click the performance tab and check the part that says memory. FYI, Memory = RAM. RAM = Random Access Memory Also if you are in Windows Vista or 7 you can use a desktop gadget called CPU Meterto see how much ram you are using and CPU usage.
The RAM and CPU requirements of the applications you typically use on your computer will vary depending on the application. Most software will come with instructions and key requirements for installation.
to conserve the battery life by reducing the bus speed between the CPU and RAM
You can use a program like CPU-Z, which will tell you the speed (in MHz), the timings and the make and model of the RAM.
64bit, It can use more than 3gb of ram, while 32bit can utilise only 3gb.
Northbridge
cpu
sure; CPU used to memory for processing data. it use mother board cache memory and it also use ram memory.
cpu
Yes automotive GPS units use ram. Almost any product that has a cpu also has a ram. But because a GPS unit isn't a full blown pc, it won't have a very big ram.