Quick Answer
The Intel Core Ultra 7 255H and 155H are both high-performance mobile processors from the same generation. The 255H generally offers slightly higher base and turbo clock speeds, while the 155H typically operates at a lower base power. The core configuration, featuring a mix of Performance, Efficient, and Low Power Efficient cores, is identical between the two.
Intel Core Ultra 7 255H vs Intel Core Ultra 7 155H: Full Comparison
Introduction
When evaluating laptops, the processor is a central component that influences overall performance, efficiency, and capability. The Intel Core Ultra 7 series represents a significant architectural shift, integrating AI-specific hardware and advanced graphics. This comparison between the Core Ultra 7 255H and the Core Ultra 7 155H aims to clarify their specifications and highlight the nuanced differences that may affect user experience. Understanding these details can help in identifying which chip might be found in devices that align with specific performance or efficiency needs.
Architecture and Core Configuration
Both processors are built on Intel’s Meteor Lake architecture, which introduces a disaggregated chiplet design. This design philosophy allows different compute modules to be manufactured on optimized process nodes.
- Identical Core Layout: Both the 255H and 155H feature a hybrid core configuration consisting of 6 Performance-cores (P-cores), 8 Efficient-cores (E-cores), and 2 Low Power Efficient-cores (LP E-cores). This totals 16 cores and 22 threads.
- Integrated AI: A key similarity is the inclusion of a dedicated Neural Processing Unit (NPU) for accelerating AI and machine learning workloads directly on the device.
- Platform Features: They share support for the same memory types (DDR5, LPDDR5/x), PCIe standards, and connectivity options like Wi-Fi 6E and Thunderbolt 4.
The architectural foundation is virtually the same, meaning software optimization and platform-level features are consistent across both models.
Performance and Clock Speeds
This is the primary area where the two processors diverge. The differences in clock speeds and power targets can influence both peak performance and sustained workload handling.
- Clock Speed Differences: The Core Ultra 7 255H typically has higher clock speeds. Its P-cores can reach a maximum turbo frequency of up to 4.8 GHz, compared to the 155H’s maximum of 4.5 GHz. The base clock speeds for the P-cores also differ.
- Power Configuration (Base Power): A notable distinction is the processor’s base power (PBP). The 155H is often configured with a lower base power, which can be a factor in thinner, lighter laptops designed for efficiency. The 255H may be configured for higher base power in devices with more robust cooling solutions.
- Real-World Implication: In most general use cases, the performance difference may be subtle. The 255H could provide a slight edge in heavily threaded applications or sustained CPU-intensive tasks if thermal conditions allow.
Graphics and Gaming
Both chips integrate Intel Arc graphics, a substantial upgrade over previous generations of Intel integrated GPUs.
- GPU Core Count: They both feature the same number of Xe-core graphics execution units, typically 8 Xe-cores.
- Clock Speed Variation: The integrated GPU in the 255H generally operates at a higher maximum graphics frequency than the one in the 155H. This can translate to marginally better frame rates in games or faster rendering in creative applications that leverage the GPU.
- Feature Support: Both support identical modern graphics APIs (DirectX 12 Ultimate, OpenGL 4.6) and features like hardware-accelerated ray tracing and XeSS (Intel’s upscaling technology).
For casual gaming and content creation, both offer a capable experience, with the 255H potentially offering a small performance uplift.
Efficiency and Use Cases
The choice between these processors in a laptop often relates to the device’s intended design and use case.
- Core Ultra 7 155H: Often found in high-performance thin-and-light laptops or premium convertibles. Its typically lower base power target can contribute to longer battery life during light tasks and may result in less heat generation, allowing for slimmer designs.
- Core Ultra 7 255H: More commonly featured in performance-focused laptops, such as certain creator notebooks or mainstream gaming laptops that prioritize CPU performance and have enhanced cooling systems to handle the higher power.
- AI Capabilities: Both chips are equally capable for AI-enhanced features like background blur, noise cancellation, and content creation tools due to their identical NPU.
Comparison Table
| Feature | Intel Core Ultra 7 255H | Intel Core Ultra 7 155H |
|---|---|---|
| Processor Cores | 6P + 8E + 2LP E-Cores (16 Cores / 22 Threads) | 6P + 8E + 2LP E-Cores (16 Cores / 22 Threads) |
| Max Turbo Frequency | Up to 4.8 GHz | Up to 4.5 GHz |
| Integrated Graphics | Intel Arc Graphics (8 Xe-cores) | Intel Arc Graphics (8 Xe-cores) |
| Max Graphics Frequency | Generally higher (e.g., 2.3 GHz) | Generally lower (e.g., 2.2 GHz) |
| Base Processor Power (PBP) | Typically configured at 28W | Typically configured at 28W, but often used in designs targeting lower base power |
| AI Engine | Intel AI Boost (NPU) | Intel AI Boost (NPU) |
| Memory Support | DDR5-5600, LPDDR5/x-7467 | DDR5-5600, LPDDR5/x-7467 |
| PCIe Support | PCIe 5.0 & 4.0 | PCIe 5.0 & 4.0 |
| Typical Use Case | Performance laptops, creator notebooks | Premium thin-and-light laptops, high-end convertibles |
Frequently Asked Questions (FAQ)
What is the main difference between the Core Ultra 7 255H and 155H?
The primary differences are in their clock speeds. The Core Ultra 7 255H generally offers higher maximum turbo frequencies for both the CPU and integrated graphics compared to the 155H.
Is the Core Ultra 7 255H significantly more powerful than the 155H?
In synthetic benchmarks, the 255H typically shows a slight lead due to its higher clock speeds. However, in real-world usage for most general productivity and multimedia tasks, the performance difference is often marginal and may not be noticeable.
Which processor is better for battery life?
Battery life depends heavily on the laptop’s overall design, battery capacity, and display. However, the Core Ultra 7 155H is often implemented in devices that prioritize efficiency and may have a lower base power target, which can contribute to longer battery life in some scenarios.
Do both processors have the same AI capabilities?
Yes. Both chips feature an identical dedicated Neural Processing Unit (NPU) called Intel AI Boost, so their performance in AI-accelerated tasks is the same.
Can both chips handle gaming?
Both integrate the same Intel Arc graphics architecture with 8 Xe-cores. They are capable of handling casual gaming and esports titles at lower to medium settings. The 255H, with its generally higher GPU clock, may provide slightly better frame rates.
Final Thoughts
The Intel Core Ultra 7 255H and 155H are closely related processors that share a foundational architecture, core count, and feature set. The 255H holds a slight performance advantage on paper due to its higher clock speeds, which may be relevant for sustained, heavy computational workloads. The 155H, while still a high-performance chip, is frequently chosen for designs that balance power with thermal and efficiency considerations. The decision between laptops featuring one or the other should extend beyond the processor label to include factors like the device’s cooling system, form factor, display quality, and battery capacity, as these elements collectively define the user experience.