What the...

[Alexander]

What is the famous difference between 32Bit and 64Bit machine???

I hear that every single time on my whole (And short) life.

[loki]

32 and 64 bits, in relation to CPUs, is referring to the size of the data chunks the processor works with. Probably the most common reason this comes up has to so with how much memory a PC can use. A 32 bit machine has a more limited range of addresses it can use to access memory (think of each memory location as a house on your street with a unique address). The max number of addresses for 32 bit desktop Windows systems is 2^32 (2 to the power of 32), or 4GB. A 64 bit system can, theoretically, access 2^64, or 17.2 billion GB of memory, (most are limited due to other constraints). There are other advantages to 64 bit computers, but they generally aren't relevant for most users right now.

http://en.wikipedia.org/wiki/32_bit
http://en.wikipedia.org/wiki/64-bit

[Alexander]

Thanks!!!