Laptop processors, and what the letters after the number mean

There are four processor families in current laptops, and the division that matters is not the brand — it is that two of them speak x86 and two speak Arm. That distinction decides what software runs natively and how long the battery lasts.

x86 is the architecture Windows software has been compiled for since the 1980s, so an Intel or AMD laptop runs essentially everything without translation. Arm chips are more power-efficient by design, which is why an Apple laptop can be fanless and still last a working day — but software written for x86 has to be translated to run on them.

Apple has largely finished that transition; almost everything a Mac user runs is now native. Windows on Arm is earlier in the same process: mainstream applications are native or translate well, and the exceptions cluster in specialist software, older professional tools, some VPN and security clients, and anti-cheat systems in games.

As with phone chips, two figures do most of the work. Single-core speed decides how responsive the machine feels — every menu, every spreadsheet recalculation, every browser tab. Multi-core decides how quickly it finishes a big job that can be split across cores: compiling, rendering, exporting, running virtual machines.

Two things are worth reading off this chart. The first is that Apple's lead is largest on single-core and narrows sharply on multi-core, where Intel's and AMD's higher core counts close the gap — an M4 leads the Core Ultra 9 comfortably on one core and trails it on all of them.

The second is the spread within the middle of the chart. Between the Core Ultra 7, the Ryzen 7 and the older Core i7, there is very little in it — and those parts appear in laptops separated by ₹40,000. At that point you are not buying processor performance; you are buying a screen, a keyboard, a chassis and a warranty.

A processor name looks like this: Core Ultra 7 155H, or Ryzen 7 8845HS, or Core i7-13700H. The brand and the number tell you roughly where it sits in the range. The letters at the end tell you what kind of machine it was designed for, and that is the more useful fact.

The suffix encodes a power budget — how many watts the chip is allowed to draw. Power is heat, heat needs cooling, and cooling decides how thick and how loud the laptop is. So the suffix is, in practice, a description of the whole machine.

The rest of the name, briefly:

• The tier — Core Ultra 5 / 7 / 9, or Ryzen 5 / 7 / 9 — is the broad performance class. Higher means more cores and higher clocks.
• The first digit or two of the number is the generation. In Core i7-13700H the 13 is the 13th generation; in Ryzen 7 8845HS the 8 is the series year. A newer generation at a lower tier frequently beats an older one at a higher tier.
• Apple uses M4, then Pro, Max and Ultra as escalating tiers. It is the clearest scheme of the four.

This is the part of laptop buying that specifications actively hide. A processor has a rated power budget, but the laptop manufacturer decides how much of it to actually allow, based on how much heat the body can remove.

The result is that the same processor, in two laptops, can differ by twenty per cent or more in sustained work. A 45 W H-series chip in a slim 14-inch body may be held to 30 W after a few minutes; the same chip in a 16-inch machine with two fans will hold its full budget indefinitely. Both are advertised with the same processor name, and short benchmarks will show them as near-identical.

What to look for instead of the chip name: fan noise under load, the sustained power figure if a review reports one, and whether the machine is thermally throttled during a long export. These are things you cannot read from a specification sheet, which is why they carry weight in our own scoring and why our laptop rankings are ordered on how machines hold up rather than on peak numbers.

Every processor in the chart above includes graphics on the same chip. For most of the last two decades that was a fallback; it is now genuinely capable, and it has changed what a laptop needs.

Current integrated graphics — AMD's Radeon 800M series, Intel's Arc, Apple's M-series GPU — will comfortably drive multiple high-resolution displays, accelerate video editing, and play most games at 1080p with settings turned down. That covers a large majority of laptop buyers, and it does so without the weight, heat, cost and battery penalty of a separate graphics card.

You still want a discrete graphics card if you:

• play current games at high settings, or at above 1080p
• render 3D, train models locally, or work in CAD
• edit high-resolution video professionally rather than occasionally

If that is you, the card matters more than the processor does — and which card is a separate question with its own answer in our graphics card guide.

One consistently better use of money than a faster processor: more memory, faster storage, and a better screen. A machine that swaps to disk because it has 8 GB of memory feels slow in a way no processor upgrade fixes, and a good external monitor improves a working day more than a tier bump ever will.