64-bit processors FAQ

Posted on Friday, February 10 2006 @ 0:35 CET by Thomas De Maesschalck
Over the last year, CPUs extending the IA-32 instruction set to 64 bits have hit the streets. There are two incarnations of it, AMD’s AMD64 and Intel’s EM64T. While very similar, there are in fact a few differences between the two. Not huge differences, but they do exist. First let’s discuss what CPUs have what capabilities. Here’s a brief list:

For the crib sheet to that, 64 bit Integer calculations are one of the things that make 64 bit CPUs so great - they can make 64 bit calculations in hardware rather than emulating it with a bunch of 32 bit calculations. The address space is the logical address space the CPU can handle. The AMD64 and EM64T CPUs do not have a full 64 bits of address space, as they won't need it for a while. They use 64 bit addresses and truncate them internally to save on die space.

You can check out this article over here.

About the Author

Thomas De Maesschalck

Thomas has been messing with computer since early childhood and firmly believes the Internet is the best thing since sliced bread. Enjoys playing with new tech, is fascinated by science, and passionate about financial markets. When not behind a computer, he can be found with running shoes on or lifting heavy weights in the weight room.

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