Knowrax86-64Linked fromLinked fromThe 7 pages that link to x86-64, each with the reason it gives.All 7Broader topic 2Related 1Narrower topic 1Compared with 3x86Broader topic: It adds 64-bit registers and addressing while retaining support for legacy x86 software.64-bit computingBroader topic: It brought 64-bit registers and expanded addressing to the widespread x86 platform.