Intel Core Ultra 7 255H

Name: Intel Core Ultra 7 255H
Brand: Intel
SKU: 45467

Manufacturer: Intel

The Intel Core Ultra 7 255H is a laptop processor designed for mobile computing, built on a 3 nm semiconductor process and housed in a BGA 2049 socket. It operates within a 28W thermal design power envelope and supports PCIe 5, with a maximum junction temperature of 110°C.

The chip uses big.LITTLE technology, combining six higher-performance cores at 2 GHz and eight efficiency cores at 1.5 GHz, for a total of 16 threads, with a turbo frequency reaching 5.1GHz and a 24 MB L3 cache. On the memory side, it supports up to 128GB of DDR5 RAM across two channels at speeds up to 8400 MHz. The integrated Arc 140T graphics includes 1024 shading units, runs at a base of 300 MHz with a turbo of 2250 MHz, and supports DirectX 12 Ultimate, OpenGL 4.6, and up to four simultaneous displays.

Pros

Supports DDR5 memory at speeds up to 8400 MHz across a dual-channel configuration, with a ceiling of 128GB total capacity
The integrated Arc 140T GPU reaches a turbo frequency of 2250 MHz and supports up to four simultaneous displays with DirectX 12 Ultimate compatibility
Built on a 3 nm semiconductor process, which allows for a 28W TDP within a mobile form factor
Turbo clock speed reaches 5.1GHz across its multi-cluster big.LITTLE configuration, with a solid multi-core PassMark score of 30,756
Broad instruction set support including AES, AVX2, FMA3, and SSE 4.2 covers a wide range of computational workloads
PCIe 5 support enables high-bandwidth connectivity for compatible storage and peripheral devices

Cons

The multiplier is locked, so clock speed cannot be manually adjusted beyond factory-set turbo behavior
Multithreading is not supported, which limits per-core parallelism in threaded workloads
ECC memory is not supported, ruling out use in error-sensitive or reliability-critical environments
The BGA 2049 socket means the processor is permanently soldered to the board and cannot be replaced or upgraded
With only 8 GPU execution units, the integrated graphics may be constrained in more demanding visual workloads despite the high turbo frequency

Who is this for?

This processor is a solid fit for users building or purchasing a mainstream laptop for productivity and everyday computing, where the combination of a 28W TDP and big.LITTLE architecture helps balance responsiveness with thermal constraints. The Arc 140T integrated graphics, with DirectX 12 Ultimate support and the ability to drive up to four simultaneous displays, makes it a reasonable choice for light creative tasks, multi-monitor office setups, and general media consumption. Users who rely on workloads that benefit from wide instruction set coverage — including AES-accelerated encryption or AVX2-optimized data processing — will also find the feature set well-matched to their needs.

Who is this NOT for?

Users who need heavy multithreaded performance may find this chip limiting, as it does not support multithreading and its locked multiplier prevents any clock speed tuning beyond factory-set turbo behavior. The integrated Arc 140T, while capable for casual use, has only 8 execution units — making this processor a poor fit for anyone expecting to run demanding GPU workloads or graphically intensive applications without a discrete graphics solution. Similarly, professionals working in environments that require ECC memory support for error-corrected computation, such as certain scientific or financial applications, will need to look elsewhere as this chip explicitly lacks that capability.

General info:

Type	Laptop
CPU socket	BGA 2049
Has integrated graphics	✓
Thermal Design Power (TDP)	28W
semiconductor size	3 nm
CPU temperature	110 °C
PCI Express (PCIe) version	5
Supports 64-bit	✓

The Intel Core Ultra 7 255H is a laptop processor built on a compact 3 nm semiconductor process and mounted via a BGA 2049 socket, making it a fixed, non-upgradeable mobile chip. It carries a 28W Thermal Design Power (TDP) and is rated for a maximum operating temperature of 110°C. The processor includes integrated graphics, supports 64-bit computing, and is compatible with PCI Express version 5 for high-bandwidth connectivity.

Performance:

CPU speed	6 x 2 & 8 x 1.5 GHz
CPU threads	16 threads
turbo clock speed	5.1GHz
Has an unlocked multiplier	✕
L3 cache	24 MB
Uses big.LITTLE technology	✓
clock multiplier	20

The processor employs big.LITTLE technology, pairing six cores running at 2 GHz with eight cores at 1.5 GHz, for a combined total of 16 threads across the two clusters. It can reach a turbo clock speed of 5.1GHz when conditions allow, while the base clock multiplier is set at 20 — and the multiplier is locked, meaning manual overclocking is not supported. A 24 MB L3 cache is available to help reduce memory latency during demanding workloads.

Benchmarks:

PassMark result	30756
PassMark result (single)	4373
PassMark result (overclocked)	30494

In PassMark benchmarking, the processor achieves a multi-core score of 30,756, reflecting its overall throughput across all available cores and threads. The single-core result of 4,373 captures per-core performance in lightly threaded workloads. An overclocked PassMark result of 30,494 is also recorded, sitting close to the standard multi-core figure given that the multiplier is locked.

Integrated graphics:

GPU clock speed	300 MHz
GPU name	Arc 140T
GPU turbo	2250 MHz
GPU execution units	8
DirectX version	DirectX 12 Ultimate
supported displays	4
OpenGL version	4.6
OpenCL version	3
texture mapping units (TMUs)	64
render output units (ROPs)	32
shading units	1024

The integrated Arc 140T GPU has a base clock of 300 MHz and a turbo frequency of 2250 MHz, backed by 8 execution units, 1024 shading units, 64 texture mapping units (TMUs), and 32 render output units (ROPs). It supports up to four simultaneous displays and is compatible with DirectX 12 Ultimate, along with OpenGL 4.6 and OpenCL 3, covering a broad range of graphics and compute workloads.

Memory:

RAM speed (max)	8400 MHz
DDR memory version	5
memory channels	2
maximum memory amount	128GB
Supports ECC memory	✕

The processor supports DDR5 memory across a dual-channel configuration, with a maximum rated speed of 8400 MHz. It can address up to 128GB of RAM in total, providing ample headroom for memory-intensive workloads. ECC memory is not supported, which is typical for this class of mobile processor.

Features:

instruction sets	MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, SSE 4.2
uses multithreading	✕
Has NX bit	✓

The processor supports a broad range of instruction sets, including MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2, enabling compatibility with a wide variety of computational and cryptographic workloads. It also includes the NX bit for hardware-level memory protection against certain types of malicious code execution. Multithreading, however, is not supported on this processor.

Final Verdict

The Intel Core Ultra 7 255H is a well-rounded mobile processor that strikes a reasonable balance between efficiency and capability within its 28W thermal envelope. Its big.LITTLE architecture, DDR5 support up to 8400 MHz, and broad instruction set coverage including AES and AVX2 make it a competent choice for productivity-focused laptops and light professional workloads. The integrated Arc 140T graphics add genuine utility for multi-display use and everyday visual tasks, though users with demanding GPU or multithreaded requirements will find the chip's limitations more apparent. For the mainstream mobile computing audience it is clearly designed to serve, the Core Ultra 7 255H delivers a cohesive and well-specified package.