Intel® Core™ Ultra 7 255U

The Intel Core Ultra 7 255U is a mobile processor with a hybrid 12-core layout (2 performance cores + 8 efficiency cores) and 14 threads, built on the Arrow Lake architecture. It launched in Jan 2025. Clocks run from 2.0 GHz base to 5.2 GHz boost. A 12-MB L3 cache backs the cores (1.3 MB per core). It addresses LPDDR5, DDR5 memory up to 128 GB across 2 channels. The chip drops into the FCBGA2049 socket and exposes PCIe 4.0 (20 lanes). Rated TDP is 15 W. Notable platform capabilities: Gaussian Neural Accelerator, Extended Page Tables (EPT), Control-flow Enforcement (CET).

The Intel Core Ultra 7 255U scores 3,654 in single-core performance and 17,873 in multi-core performance (PassMark CPU Mark ratings). From those two ratings Feex computes 8,081 for overall performance, 16,733 for productivity performance, 16,407 for creator performance, 19,437 for engineering performance and 15,430 for gaming performance. Its multi-core throughput works out to 1,489 per core, 1,277 per thread and 1,192 per watt. Its computed efficiency index is 2,087. Its performance index is 100, equal to the Intel Core i5-12400. Each bar shows the score as a share of a reference ceiling, which is the larger of the 99th-percentile score across the Feex CPU database and a fixed baseline.

Scores for individual PassMark CPU Mark test categories. Higher is better. These are measured test scores, not computed from the single-core and multi-core ratings.

In the individual workload tests the Intel Core Ultra 7 255U scores 65,682 in integer math, 45,877 in floating-point math, 196,731 in compression, 12,440 in cryptography, 1,141 in physics simulation, 10,860 in vector SIMD, 63 in the prime sieve and 21,352 in sorting. Higher is better. Compared with the Intel Core i5-12400, it is 12% above in integer math, equal in floating-point math, 14% below in compression, 8% above in cryptography, 5% above in physics simulation, 30% below in vector SIMD, 6% below in the prime sieve and 6% below in sorting. Each bar shows the score as a share of that workload's reference ceiling, the larger of the 99th-percentile score across CPUs with a recorded value and a fixed baseline.

The Intel Core Ultra 7 255U has 12 physical cores and runs 14 logical threads. It uses a hybrid layout of 2 performance cores and 8 efficiency cores. It runs at a base clock of 2.00 GHz and boosts up to 5.20 GHz.

The Intel Core Ultra 7 255U is a mobile processor, belongs to the Intel Core Ultra 7 family, uses the Arrow Lake architecture, carries the codename Arrow Lake and is manufactured on a 3 nm process. It launched in Jan 2025.

The Intel Core Ultra 7 255U has 1.16 MB of L1 cache, 2 MB of L2 cache and 12 MB of L3 cache. That adds up to about 15.2 MB of cache, or 1.26 MB per core.

The Intel Core Ultra 7 255U has a 3-level cache hierarchy: L1 at 1.2 MB, L2 at 2 MB and L3 at 12 MB. L3 is the largest level and makes up about 79% of the cache listed here.

The Intel Core Ultra 7 255U supports LPDDR5, DDR5 memory, addresses up to 128 GB of memory, uses 2 memory channels and runs memory at up to 8,400 MT/s. It does not support DDR4 memory. It does not support ECC memory.

The Intel Core Ultra 7 255U includes integrated graphics (Intel Graphics) and clocks the graphics up to 2.10 GHz.

The Intel Core Ultra 7 255U uses the FCBGA2049 socket, supports PCI Express 4.0 and provides up to 20 PCIe lanes.

The Intel Core Ultra 7 255U has a rated TDP of 15 W.

Instruction sets, security, virtualization, AI acceleration and OS readiness. Features are listed as supported, explicitly not supported, or not recorded; a feature that is not recorded is not the same as unsupported.

The Intel Core Ultra 7 255U is also identified by the model number 255U and the processor number 255U.

Feex has recorded 63% of the specifications it tracks for the Intel Core Ultra 7 255U. Values Feex does not hold are shown as "Not recorded" rather than estimated.

Not recorded: Core Configuration: Threads per Core, All-Core Boost and Unlocked Multiplier. Architecture & Generation: ISA Family and Market Status. Cache: L2 Cache (per Core) and L4 Cache. Memory Support: Memory Bandwidth. Graphics: Graphics Base Clock, Execution Units, Display Outputs and Max Video Memory. Platform & Compatibility: Package and Package Size. Power & Thermals: Base Power, Maximum Turbo Power, Configurable TDP (Min), Configurable TDP (Max), Max Junction Temperature and Tcase. Physical & Manufacturing: Transistor Count, Die Size, Die Count, Foundry and Launch Price. Naming & Aliases: SKU and Part Number.

Processors that use the same FCBGA2049 socket as the Intel Core Ultra 7 255U and have the closest multi-core scores in the Feex database include Intel Core Ultra 5 225U, Intel Core Ultra 7 265U, Intel Core Ultra 5 235U, Intel Core Ultra 5 125U and Intel Core Ultra 5 135U.