Assuming that major applications, operating systems, and hardware drivers are eventually ported to ARM, could ARM completely replace x86 in computers and servers? Is software compatibility and the existing x86 ecosystem the main reason x86 remains dominant, or are there technical limitations that would prevent ARM from taking over?
5 Answers
The most realistic outcome is gradual replacement rather than a clean switch. New computers, servers, and cloud systems can increasingly use ARM while emulation keeps older software working. x86 may eventually become uncommon for new products, but legacy systems could continue running for many decades, much like older mainframes and long-lived COBOL or Fortran applications.
A transition is possible, but “completely” is the difficult part. Old industrial systems, medical equipment, ATMs, and other safety- or mission-critical machines can remain in service for decades. Some cannot simply be rewritten because their behavior has been validated, certified, or tied to specialized hardware. Those systems may need emulation, replacement hardware, or continued x86-compatible chips.
ARM is not one perfectly uniform platform in the same way people often imagine x86 to be. Different ARM chips can support different instruction extensions, peripherals, boot processes, and operating-system requirements. Software generally has to target a specific ARM64 environment, and drivers or applications may still need significant changes. ARM also has vector extensions and specialized capabilities that can handle demanding workloads, so raw performance is not a fundamental barrier, but compatibility and optimization still matter.
For example, a program compiled for one ARM-based device is not automatically guaranteed to run on every other ARM system. The operating system, ABI, drivers, and optional CPU features all matter.
ARM is already successful in desktops and laptops. Apple moved its Mac computers to ARM-based processors, and Linux has supported ARM for a long time. Windows can also run many x86 and x64 programs through emulation. The transition works best when one company controls the hardware and operating system, while the more open PC ecosystem has to coordinate many manufacturers, developers, and driver vendors.
Yes, in principle. There is nothing uniquely impossible about x86 that ARM cannot do. The biggest obstacles are market share, cost, and the enormous amount of existing software, drivers, virtual machines, and hardware that would need to be rebuilt or tested. Companies have little incentive to fund a full port unless enough customers are already using ARM.
That is especially true for safety-critical systems. They are designed with strict failure requirements, so replacing a proven platform can require years of testing and certification rather than just recompiling the software.