15 specifications

Intel Core i9-13900K vs Intel Core i9-13900KS

On paper, the Intel Core i9-13900KS boosts higher. Specifications describe what each chip is designed to do; how much of that either one holds under continuous load is a separate question.

10 specifications · 2 with a higher side

Full specifications

Intel Core i9-13900K

Intel · Raptor Lake (13th gen) · Desktop

Full specifications

Intel Core i9-13900KS

Intel · Raptor Lake (13th gen) · Desktop

Cores and clocks

Cores

Threads

Base clock

3.0 GHz

3.2 GHz

Boost clock

5.8 GHz

6.0 GHz

Cache and power

L3 cache

36 MB

TDP

125 W

150 W

Platform

Socket

FCLGA1700

Process

Not verified

Integrated graphics

Intel UHD Graphics 770

Launched

2022-10-20

2023-01-12

A check marks the higher figure only on rows where higher is unambiguously better. Rows without one are not ties; they are specifications where “better” has no meaning.

Reading the table

What the difference means.

A year apart

The Core i9-13900KS (Raptor Lake (13th gen), 2023) is a year newer than the Core i9-13900K (Raptor Lake (13th gen), 2022). That matters more than any single row in the table, because a newer design usually does more work in each clock cycle. Clock speeds are only a fair comparison between chips of the same generation; across generations, a lower number on the newer chip can still be the faster core.

Boost clock

The Core i9-13900KS boosts to 6 GHz against 5.8 GHz, 3 percent higher. Within one generation that is a fair guide to single-core speed. Boost is also a peak: it is held for seconds to minutes, on one or two cores, while the cooling and the power limit allow. What either chip settles at under a long load is lower, and it depends on the cooler and the motherboard as much as the chip.

Power and cooling

The Core i9-13900KS is rated at 150 W against 125 W. The rating is the heat the cooler has to move for the chip to hold its speed, and modern chips draw well above it in short bursts. A tower cooler or a liquid loop suits the Core i9-13900KS; the Core i9-13900K is easier to keep quiet and fits smaller cases. A chip whose cooling falls short does not fail. It slows down, and it does so after the first minute, which is why short benchmarks miss it.

Platform

Both use the FCLGA1700 socket and DDR4 or DDR5, depending on the motherboard memory, so one can replace the other on the same motherboard. Check the board maker's support list first: an older board often needs a firmware update before it recognises a newer chip.

Which to pick, on paper

A quiet or compact build: Core i9-13900K; 125 W against 150 W: less heat to move, so a smaller cooler and slower fans.
Upgrading without a new motherboard: Either; Same FCLGA1700 socket. Update the board's firmware before swapping.

What no table says

How much of its speed a processor keeps after the first minute depends on the cooling and the power limit of the machine it is in. If you own one of these, measure it: the test is free and runs in this browser.

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Questions

Is the Core i9-13900K better than the Core i9-13900KS?: By need, on the specifications: a quiet or compact build: the Core i9-13900K; upgrading without a new motherboard: either. No specification says how much speed either one keeps under a long load; that depends on the cooling and the power limit of the machine it is in, and it is what a sustained test measures.
Do the Core i9-13900K and the Core i9-13900KS use the same socket?: Yes, both use FCLGA1700, so either fits the other's motherboard. Check the board's support list and update its firmware first.
Does the Core i9-13900K or the Core i9-13900KS have integrated graphics?: Both do: Intel UHD Graphics 770 on the Core i9-13900K and Intel UHD Graphics 770 on the Core i9-13900KS.
Which runs hotter, the Core i9-13900K or the Core i9-13900KS?: The Core i9-13900KS is rated at 150 W against 125 W, so it produces more heat under load and needs the larger cooler. How hot either one actually runs depends on the cooler and the case more than on the chip.

More comparisons

Every figure on this table is a design target. None of it is a measurement.

Nothing above describes how a processor behaves twenty minutes into a sustained workload, which is where two chips with nearly identical specifications routinely diverge. A boost clock is a ceiling the vendor permits, not a rate the chip sustains, and whether it holds depends on the cooling, the case, the power profile and the room. None of those appear on a specification sheet.

We deliberately do not reduce these figures to a single score. A composite invented from specifications would look authoritative and measure nothing, and choosing the weights would be choosing the winner.

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