Two broad families of processor design dominate computing: x86, long the standard in laptops and desktops, and ARM, long the standard in phones and increasingly appearing in laptops. The difference between them is discussed as though it were a rivalry with a winner, but it is really a difference in philosophy and history, and understanding it explains why ARM chips are efficient, why software compatibility can be an issue, and where each currently leads.
What actually differs
At the lowest level, the two families use different instruction sets, the fundamental vocabulary of commands a processor understands. x86 grew up with a large, complex instruction set built over decades, while ARM was designed later with a smaller, simpler one. This difference is real but is the least interesting part of the comparison, because both families have evolved enormously and modern chips of both kinds are sophisticated. The instruction set is where the distinction begins, not where it matters most.
What matters more is the design philosophy that grew around each. ARM’s simpler foundation and its origins in low-power devices led to designs that prioritise efficiency, doing the most work per unit of power, while x86’s history in plugged-in machines led to designs that prioritised raw performance, with efficiency a later concern. These are tendencies rather than laws, but they explain the reputations each family carries.
Why ARM chips are efficient
ARM’s reputation for efficiency is well earned and comes from its heritage. Because ARM designs grew up in phones, where battery life is everything, efficiency was the central design goal from the start, and that focus produced chips that deliver strong performance for very little power. This is why phones, which must last a day on a small battery, use ARM chips, and why ARM-based laptops can offer long battery life. The efficiency is not magic; it is the result of a design tradition built around doing more with less power, the same performance-per-watt focus the guide on reading what matters in a chip highlights as more meaningful than headline numbers.
| ARM | x86 | |
|---|---|---|
| Heritage | Low-power devices, phones | Plugged-in computers |
| Strength | Efficiency, performance per watt | Raw sustained performance, compatibility |
| Software | Growing, sometimes needs translation | Vast existing library |
| Where it leads | Phones, efficient laptops | Desktops, wide software support |
The software compatibility question
The most practical difference for buyers is software compatibility. Because x86 has been the standard in computers for decades, an enormous library of software is built for it, and it runs natively on x86 machines. Software built for x86 does not automatically run on ARM, so ARM computers rely on either software written or updated for ARM, or a translation layer that runs x86 software by converting it on the fly. Translation has become impressively good, so most software runs on modern ARM computers, but it can be slower than native, and occasionally something does not work. This is the main practical consideration when choosing an ARM computer, and it is worth checking that the specific software you depend on runs well.
Memory architecture and integration
ARM designs, particularly in phones and some laptops, often integrate more of the system onto a single chip and use memory in tightly integrated ways, which contributes to their efficiency and compactness. This integration is part of why ARM-based devices can be thin, light, and long-lasting, though it also means less of the system is upgradeable, since integrated components cannot be swapped. The tradeoff of integration, efficiency and compactness against upgradeability, is one that appears across modern hardware, and it connects to the broader integration discussed in the guide on how integrated graphics share memory and the boost behaviour in the piece on how chips manage their clocks, as well as the security hardware in the guide on what a secure enclave does.
Where each currently leads
Neither family is simply better; each leads where its strengths matter. ARM dominates phones and is making strong gains in laptops, especially where efficiency and battery life are priorities, with performance now competitive for most tasks. x86 remains dominant in desktops, in machines needing the widest software compatibility, and where raw sustained performance under heavy load is the priority. The gap has narrowed dramatically, with ARM matching or exceeding x86 in efficiency and closing in on performance, while x86 retains its compatibility advantage and strength in the most demanding sustained workloads. For most buyers the choice now comes down to the specific machine and its software support rather than the underlying architecture, which matters far less to the experience than it once did, a convergence the guide on how the whole system works together reflects.
Why the rivalry framing misleads
Presenting ARM and x86 as rivals with an inevitable winner misses how the two are actually converging. Both now produce chips that mix fast and efficient cores, both are used across a widening range of devices, and both borrow ideas from each other as they evolve. The old picture of ARM as the phone chip and x86 as the computer chip has blurred, with ARM in capable laptops and x86 chips reaching for the efficiency ARM is known for. The interesting story is not which family wins but how the practical differences that once separated them are shrinking.
For the person buying a device, this convergence is good news, because it means the underlying architecture matters less to the experience than it used to. What matters is how a specific machine performs, how long it lasts on a charge, and whether the software you need runs well on it, questions answered by looking at the actual device rather than debating architectures. The sensible response to the ARM versus x86 question is therefore to stop treating it as the deciding factor and to judge each machine on its real behaviour, which is where the differences that affect you actually show up.
Frequently asked questions
Is ARM better than x86?
Neither is simply better; each leads where its strengths matter. ARM excels at efficiency and performance per watt, dominating phones and gaining in laptops, while x86 leads in raw sustained performance and the widest software compatibility, dominating desktops. The gap has narrowed dramatically. For most buyers the choice now depends on the specific machine and its software support rather than the architecture, which matters less than it once did.
Will my software run on an ARM computer?
Most modern software will, either natively if built for ARM or through a translation layer that runs x86 software by converting it on the fly, which has become impressively good. But translated software can be slower than native, and occasionally something does not work. If you depend on specific software, especially older or specialised programs, it is worth checking that it runs well on ARM before buying an ARM computer.
Why are ARM chips more efficient?
Because ARM designs grew up in phones, where battery life is everything, so efficiency was the central design goal from the start. That heritage produced chips that deliver strong performance for very little power, using a design tradition built around doing more with less. The efficiency comes from decades of optimising for low-power devices, not from any single feature, which is why ARM leads where battery life matters most.
