Processors/Intel Core Ultra 7 255HX
Intel · Core Ultra 200HX (Arrow Lake) · Laptop
Intel Core Ultra 7 255HX
The Intel Core Ultra 7 255HX is Intel’s Core Ultra 200HX (Arrow Lake) mobile processor with 20 cores, a boost clock of 5.2 GHz and 30 MB of L3 cache.
Drawn from this part’s own specifications. No openly-licensed photograph of the Intel Core Ultra 7 255HX exists, so this is an illustration rather than a photograph.
Overview
The Intel Core Ultra 7 255HX is Intel’s Core Ultra 200HX (Arrow Lake) mobile processor with 20 cores, a boost clock of 5.2 GHz and 30 MB of L3 cache. These are the manufacturer’s published figures. They describe what the chip is designed to do, not what your particular machine does with it, and the gap between those two is usually cooling. A boost clock is a ceiling rather than a promise, and how long a processor holds it under continuous load is the one thing no specification sheet can tell you.
Specifications
- Cores
- 20
- Threads
- 20
- Base clock
- 2.4 GHz
- Boost clock
- 5.2 GHz
- L3 cache
- 30 MB
- TDP
- 55 W
- Maximum turbo power
- 160 W
- Minimum assured power
- 45 W
- Socket
- FCBGA2114
- Process
- 3 nm
- Integrated graphics
- Intel Graphics
- Launched
- Q1'25 (quarter)
Physical cores. More helps sustained multi-threaded work, not single-task responsiveness.
The floor the vendor guarantees under load. Often closer to reality than boost.
A ceiling, not a promise. How long a chip holds it is the thing a spec sheet cannot tell you.
Design power, not measured draw. Where a range is shown, the manufacturer allows the laptop maker to choose within it, and the choice materially changes sustained performance.
Intel's ceiling for short bursts. Not a configurable TDP.
Sources
Each figure, the label its source printed beside it, and the day it was read.
| Figure | As printed | Source | Checked |
|---|---|---|---|
| Cores20 | Total Cores | intel.comSpecification page | |
| Threads20 | Total Threads | intel.comSpecification page | |
| Base clock2.4 GHz | Performance-core Base Frequency | intel.comSpecification page | |
| Boost clock5.2 GHz | Max Turbo Frequency | intel.comSpecification page | |
| L3 cache30 MB | Cache | intel.comSpecification page | |
| TDP55 W | Processor Base Power | intel.comSpecification page | |
| Maximum turbo power160 W | Maximum Turbo Power | intel.comSpecification page | |
| Minimum assured power45 W | Minimum Assured Power | intel.comSpecification page | |
| SocketFCBGA2114 | Sockets Supported | intel.comSpecification page | |
| Process3 nm | CPU Lithography | intel.comSpecification page | |
| Integrated graphicsIntel Graphics | GPU Name | intel.comSpecification page | |
| LaunchedQ1'25 (quarter) | Launch Date | intel.comSpecification page |
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Compare
The 6 nearest processors in the same segment, each with a published side-by-side.
Other processors in Intel Core Ultra 200HX (Arrow Lake)
What these numbers mean
Every figure on this sheet 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.