Phone vs laptop vs desktop: how performance really compares

Why a phone scores lower than a laptop or desktop on the same test, what power and cooling have to do with it, why a laptop changes on battery, and how one score covers every device while the tier judges each against its own type.

Put a flagship phone and a good desktop through the same test and the desktop will usually win, often by a wide margin — even when the phone’s spec sheet sounds impressive. That is not a flaw in either device. It comes down to two limits every device lives within: how much power it can draw, and how much heat it can get rid of.

Power and heat set the limit

A processor turns electricity into work and heat. A desktop has a wall socket, large heatsinks and fans, so it can draw a lot of power for as long as you like. A laptop has a battery, a smaller cooling system and a case a couple of centimetres thick. A phone has a battery, no fan at all, and a few millimetres of glass and metal to spread its heat.

So the same kind of processor core runs at very different speeds depending on where it is fitted, and for how long. Phones and thin laptops are built to be fast in short bursts — opening an app, loading a page — and then to settle back to a level they can hold without overheating.

Short bursts against sustained work

This is why the length of a test matters. A few seconds of work shows a phone at its best; a minute of full load, which is what DeadTier runs, shows how much of that speed it can keep. The speed-under-load chart on the results screen makes the difference visible. A device with plenty of cooling tends to hold a flat line, while a phone or a thin laptop may start high and step down as it warms up. Neither is wrong; they are built for different jobs.

Laptops change on battery

Laptops add a twist: most run differently on the charger and on battery. On battery, the system often limits the processor to save power, so the same laptop can earn a lower tier unplugged than plugged in. Both results are real — they describe the laptop in two different modes. For a fair comparison between devices, test them the same way. The site suggests unplugged, and says when it can see that a charger is connected.

Core counts do not tell the whole story

A phone with eight cores and a laptop with eight cores are not equals. Many phone chips pair a few fast cores with several slower, efficient ones, and the slower ones are there to save battery rather than to win benchmarks. The CPU score counts the work all the cores manage together, and the results screen also shows the gap between the fastest and slowest worker it measured, which hints at that mix.

One score, judged against its own type

DeadTier answers two different questions and keeps them apart. The score out of 100 answers “how powerful is this device?” on one scale for every type, where 100 means matching a strong current desktop. That is what makes it fair to compare a phone with a laptop. The tier answers “is this a good phone?” — or a good laptop — by comparing the score with what a strong current device of the same type reaches.

Until enough devices of a type have been tested here, that comparison uses an estimate of what a strong current device of each type scores. These are the estimates in use, calculated from the scoring code:

Device type	What a strong current one scores, out of 100
Phone	83
Tablet	83
Laptop	94
Desktop	100

They are estimates, and the site says so. The phone figure is anchored on a real measured phone plus one stated assumption about how much faster a flagship phone core is than a budget one, and the other types are scaled from the same starting point. Once 30 devices of a type have been tested, the tier stops using these numbers and comes from where a device actually falls among the ones tested here.

That is why the same score can be High-End for a phone and Mid-Range for a desktop: the same number, answering a different question. The full ranges are in what the score means.

So which should you buy?

For sustained work — editing video, compiling code, long gaming sessions — the extra power and cooling of a laptop or desktop are worth paying for. For short, bursty tasks a good phone is plenty, which is why a phone can feel fast in daily use while scoring well below a laptop. If you are choosing between two particular devices, test both and compare them side by side: that comparison needs no estimate at all.

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