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Intel Core Ultra 7 155UL specifications and in-depth review

Intel Core Ultra 7 155UL

Manufacturer: Intel

The Intel Core Ultra 7 155UL is a mobile-oriented processor designed around efficiency, combining a heterogeneous core layout with a modest 15W Thermal Design Power that makes it well-suited for thin and light computing form factors. It uses big.LITTLE technology to distribute workloads across two performance cores running at 1.7 GHz and eight efficiency cores at 1.2 GHz, with turbo speeds climbing to 4.8 GHz when conditions allow. The chip sits in the LGA 1851 socket and is fabricated on a 7 nm process node.

On the memory side, the Core Ultra 7 155UL supports DDR5 RAM at up to 5600 MHz across two channels, with a maximum addressable capacity of 96 GB, though ECC memory is not supported. Its integrated graphics reach a turbo frequency of 1950 MHz and are compatible with DirectX 12 Ultimate, OpenGL 4.6, and OpenCL 3, with support for up to four simultaneous displays. The processor also includes a 12 MB L3 cache, 14 threads via multithreading, PCIe 4 support, and a broad instruction set that covers AVX2, AES, FMA3, and SSE 4.2 among others.

Pros
  • Supports up to 96 GB of DDR5 RAM at 5600 MHz across two channels, offering substantial memory capacity for demanding workloads
  • The turbo clock speed reaches 4.8 GHz, enabling strong burst performance when needed
  • Integrated graphics support DirectX 12 Ultimate, OpenGL 4.6, and OpenCL 3, covering a wide range of rendering and compute tasks without a discrete GPU
  • Up to four displays can be driven simultaneously through the integrated graphics unit
  • A broad instruction set including AVX2, AES, FMA3, and SSE 4.2 enables hardware-accelerated operations across cryptographic, floating-point, and multimedia tasks
  • The 15W TDP makes it suited for thermally constrained environments such as compact or fanless system designs
Cons
  • The clock multiplier is locked, leaving no option for manual frequency adjustments beyond factory settings
  • ECC memory is not supported, limiting use in applications that require error-correcting memory for data integrity
  • The base clock speeds of 1.7 GHz and 1.2 GHz are relatively modest, with sustained performance depending heavily on turbo availability
  • With only 12 MB of L3 cache, cache-sensitive workloads may encounter limitations under heavier multitasking scenarios
Who is this for?

This processor is a strong fit for users building or buying thin and light laptops or compact systems where thermal headroom is limited, given its 15W TDP and 105 °C maximum temperature rating. The combination of DDR5 support at up to 5600 MHz, 96 GB maximum memory capacity, and 14 threads makes it well-suited for productivity-focused and lightly creative workflows such as document editing, coding, video conferencing, and moderate content work. The integrated graphics with DirectX 12 Ultimate support and four-display output also make it a reasonable choice for users who need multi-monitor setups without a discrete GPU.

Who is this NOT for?

Users looking to run demanding gaming titles or GPU-intensive applications will find the integrated graphics unit insufficient, as it lacks the dedicated memory and compute capacity of a discrete graphics card. The locked clock multiplier and relatively modest base frequencies also make this processor a poor match for enthusiast or overclocking builds where frequency customization is expected. Additionally, workloads that depend on ECC memory for data integrity — such as certain server-side applications or scientific computing tasks — are not supported by this chip's memory configuration.

General info:

CPU socket LGA 1851
Has integrated graphics ✓
Thermal Design Power (TDP) 15W
semiconductor size 7 nm
CPU temperature 105 °C
PCI Express (PCIe) version 4
Supports 64-bit ✓

The Intel Core Ultra 7 155UL uses the LGA 1851 socket and is built on a 7 nm semiconductor process, keeping its Thermal Design Power at just 15W, which reflects its efficiency-oriented design. It includes integrated graphics and fully supports 64-bit operation, while the maximum rated CPU temperature sits at 105 °C. Connectivity is handled through PCI Express 4, providing a current-generation interface for compatible components.

Performance:

CPU speed 2 x 1.7 & 8 x 1.2 GHz
CPU threads 14 threads
turbo clock speed 4.8GHz
Has an unlocked multiplier ✕
L3 cache 12 MB
Uses big.LITTLE technology ✓
clock multiplier 17

The processor features a heterogeneous core configuration enabled by big.LITTLE technology, pairing two performance cores at 1.7 GHz with eight efficiency cores at 1.2 GHz, for a total of 14 threads across the chip. Under sustained load, the turbo clock speed reaches 4.8 GHz, with a clock multiplier of 17 governing frequency scaling. A 12 MB L3 cache supports the compute workload, though the multiplier is locked, meaning manual frequency adjustments beyond the stock configuration are not available.

Benchmarks:

Integrated graphics:

GPU turbo 1950 MHz
DirectX version DirectX 12 Ultimate
supported displays 4
OpenGL version 4.6
OpenCL version 3

The integrated graphics unit reaches a turbo frequency of 1950 MHz and supports up to four displays simultaneously. On the API side, it is compatible with DirectX 12 Ultimate, OpenGL 4.6, and OpenCL 3, covering a broad range of graphics and compute workloads without requiring a discrete GPU.

Memory:

RAM speed (max) 5600 MHz
DDR memory version 5
memory channels 2
maximum memory amount 96GB
Supports ECC memory ✕

The processor supports DDR5 memory at speeds of up to 5600 MHz across two channels, allowing for adequate bandwidth in dual-channel configurations. The maximum supported memory capacity reaches 96 GB, providing considerable headroom for memory-intensive workloads. ECC memory is not supported, which is a common characteristic for this class of consumer-oriented 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 set of instruction sets including MMX, AVX, AVX2, FMA3, F16C, AES, SSE 4.1, and SSE 4.2, enabling a wide range of compute, cryptographic, and floating-point operations at the hardware level. Multithreading is supported, allowing the chip to handle multiple threads simultaneously across its cores. Additionally, the NX bit is present, providing a hardware-level memory protection feature that helps guard against certain classes of malicious code execution.

Final Verdict

The Intel Core Ultra 7 155UL is a processor clearly shaped around efficiency and versatility within thermally constrained environments. Its 15W TDP paired with DDR5 support and a 4.8 GHz turbo clock strikes a balance that serves everyday productivity and moderately demanding workloads without requiring active cooling overhead. The integrated graphics capability, multi-display support, and broad instruction set add genuine utility for users who do not need a discrete GPU. Where it naturally falls short — locked multiplier, no ECC support, and modest base frequencies — reflects design trade-offs that are consistent with its target use case rather than outright shortcomings. For users seeking a capable, thermally sensible processor for compact systems and productivity-driven computing, the Core Ultra 7 155UL represents a well-defined, coherent option within its segment.

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