Register size of Intel processors

By RianShelAbbe
Mar 16, 2007
  1. I see that the Pentium D is a 64-bit processor, but when I search for Intel processors with 64-bit registers, only the Itaniums are listed. What is the register width of the Pentium D processor? Also, know of any good websites that provide information like this for processors?
  2. Nodsu

    Nodsu TS Rookie Posts: 5,837   +6

    Well, the register size depends on what kind of registers you mean and what mode the processor is in.

    In full 64-bit mode, x64 processors have 16 64-bit general-purpose registers plus the floating point and multimedia stuff. You can still use all the registers with less than 64 bits of data of course.

    And, I know this may come as a shock to you, but Intel for example actually supplies documentation for its products :p
    Like, when you look under "Technical Documentation", you may find a page like this:
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