Main difference between 32 bits and 64 bits

[lvthn]

Is it realy worth upgrading a computer to 64 bits architecture or it doesnt really change a thing?

[Jman]

It mainly removes limits, like the amount of addressable memory. Unless you have gigabytes of RAM or do 64 bit operations all the time, 32 should be fine for now.

[imdeemvp]

Well it does chage a lot and it applies to graphics, system performance, and more.....but if you are satisfied with what you HAVE just keep it. It will be a while for OS's to be fully 64 bit.

[Taft]

Athlon 64 CPUs have the memory controller on-die which is a very efficient design choice. They also run cooler which will save on your hydro bill and fan noise (or allow for significant overclocking if that's your thing). Of course this is the case if you are running either 32- or 64-bit OS - just pointing out there are plenty of advantages besides running a 64-bit OS.

[JLF_65]

64bit mode also allows OSes like linux to use a fast system call instruction to lessen the overhead in calling system functions. Combined with the extra registers, 64bit linux is noticeably more responsive to the user than 32bit on the same computer.