During my research about 64 and 32 bit operating system I found many people confused about what computer they should purchase or what “bit” system they should choose…I think this article is a great help for people to choose the correct machine for their use.
There are 3 most obvious advantage of having 64 bit Operating system:
Extended address space
Bigger number of general-purpose registers.
The extended 64-bit address space theoretically allows the processor to work with 16 Ebytes (2^64) of physical memory within the flat memory model. Although contemporary 64-bit processors can adress only 1 Tbyte (2^40) of memory in practice, it is still much higher than in case of 32-bit addressing. A larger amount of available memory in its turn allows you to eliminate or greatly reduce sluggish operations of data swapping to the disk.
The bigger number of registers and increase of their size allow the processor to handle large memory areas simultaneously, to handle variables and arrays more effectively and to pass function arguments in registers instead of the stack.
Keep in mind that you must port your program using the 64-bit version of the compiler and consider changes of the data model (new type capacities) to get a real performance gain on a 64-bit processor. Launching an application not adapted for the 64-bit platform might on the contrary cause great performance loss depending on the specifics of the architecture of the processor being used.
But the greatest performance gain from moving to the 64-bit platform awaits those applications which handle large data arrays – these are CAD/CAE-like programs, data managers, programs to work with digital media and applied scientific applications. The performance gain might be of several hundred percent for this kind of software.