Smartphone processors, explained without the marketing

Every phone you can buy runs one of four processor families, and they are not four versions of the same thing. Two of them are sold to phone makers, one is used only by the company that designs it, and one is a semi-custom job.

The important structural fact is the first column against the third. Apple and Google design chips for their own phones; Qualcomm and MediaTek sell to everybody else. That is why an iPhone's chip is matched precisely to its software and why two Android phones with identical Snapdragons can behave quite differently — the chip is the same, the cooling, the display driver and the manufacturer's own software layer are not.

It is also why brand loyalty at the chip level makes little sense. Samsung ships Snapdragon in some regions and its own Exynos in others; Nothing has used both Snapdragon and Dimensity across its range. The family name on the spec sheet tells you less about the phone than the tier does.

Almost every chip comparison you will read is built on Geekbench, which reports two numbers. They measure different things and only one of them describes how a phone feels.

Single-core is one processor core doing one job as fast as it can. Opening an app, rendering a web page, scrolling a list — these are bursts of work that cannot be split up, so they finish at whatever speed one core manages. This is the number that decides whether a phone feels quick.

Multi-core is every core working at once. It matters for exporting video, editing large photos and heavy multitasking. It is also the larger, more impressive number, which is why it is the one that appears in marketing.

Switch between the two below and watch the order change.

The reordering is the point. Apple's A18 Pro leads comfortably on single-core and is beaten on multi-core by the Snapdragon 8 Elite, because the two companies made opposite bets: Apple builds a small number of very wide, very fast cores, and Qualcomm builds more of them. Neither is wrong. They are optimised for different work, and a spec sheet quoting only one of the two numbers is telling you half a story on purpose.

Chip names look like a hierarchy and are not one. The gaps between tiers are large, the gaps within a tier are small, and the characters that separate them are deliberately quiet — a lowercase letter, a plus sign, a generation number that moves independently of the tier.

The practical rule: ignore the family, find the exact full name, and check the tier. A phone listing that says only “Snapdragon 8-series processor” without the full name is not telling you what you are buying, and that is usually not an accident.

A benchmark run takes a couple of minutes. A game lasts an hour, and this is where two phones with the same chip stop being the same phone.

Silicon produces heat in proportion to how hard it is working, and a phone has no fan. Once the body reaches a temperature the manufacturer has decided is unacceptable — for the battery, or for your hand — the software reduces the clock speed until it cools. This is thermal throttling, it is normal, and how aggressively it happens is a design decision made by the phone maker rather than the chip maker.

A thick gaming phone with a vapour chamber will hold near-peak speed for an hour. A thin flagship with the identical chip may drop by a third within fifteen minutes. Both post the same benchmark score, because the benchmark finished before either got hot.

This is the section that should change what you buy, and it is deliberately not organised by brand.

The row that matters most is the second one. An upper-mid-range chip today outperforms the flagship of three or four years ago, and phones age out on software support and battery health long before that silicon becomes too slow to use. Paying flagship money for a chip you will never fully load is the single most common overspend in phone buying.

Which is also the point at which the processor stops being the interesting question. Above roughly ₹30,000, the difference between two phones is the display, the cameras, the build and how many years of updates the manufacturer has committed to in writing — and our phone rankings are ordered on those, with the chip as one input rather than the headline.

A phone processor is not only processor cores. Three other blocks sit on the same piece of silicon, none of them appears in a Geekbench score, and at least one of them will affect your daily experience more than the core count does.

The modem decides whether you have signal in a lift, on a train, or at the edge of a cell. Qualcomm's modems have a long-standing and well-earned reputation here, and it is the least glamorous advantage in the industry. Nobody has ever chosen a phone for its modem; plenty of people have returned one because of it.

The image signal processor turns what the camera sensor captures into a photograph — noise reduction, exposure blending, the multi-frame stacking that happens between pressing the shutter and seeing the result. Two phones with identical camera sensors and different ISPs produce visibly different pictures. This is a large part of why Pixel photographs look like Pixel photographs.

The NPU runs machine-learning work on the device instead of in a data centre: live translation, voice transcription, the generative editing tools now shipping on most flagships. This is where Google's Tensor spends the budget it declines to spend on raw speed, and it is a real trade rather than a shortfall — a Pixel loses on the chart above and wins at things the chart does not measure.