Quick Answer
The Intel Core Ultra 7 255U and Core Ultra 7 155U are closely related mobile processors from the same generation. The 255U generally offers a slight increase in base and turbo clock speeds for both its Performance-cores (P-cores) and Efficient-cores (E-cores) compared to the 155U, which can translate to marginally better performance in some workloads. Their core architecture, integrated graphics, and feature sets are otherwise identical.
Intel Core Ultra 7 255U vs Intel Core Ultra 7 155U: Full Comparison
Introduction
When evaluating laptops, understanding the nuances between similar processors is key to making an informed choice. The Intel Core Ultra 7 255U and Core Ultra 7 155U are part of Intel’s Meteor Lake lineup, designed for thin-and-light laptops that balance performance with power efficiency. This comparison breaks down their specifications, performance characteristics, and features to clarify the differences between these two chips, helping you determine which might be more suitable for specific computing needs.
Architecture and Core Configuration
Both processors share the same fundamental architecture, built on Intel’s 4 process node. They utilize a hybrid core design that combines different types of cores for optimized performance and efficiency.
- Core Configuration: Both chips feature an identical layout: 2 Performance-cores (P-cores), 8 Efficient-cores (E-cores), and 2 Low Power Efficient-cores (LP E-cores). This totals 12 cores and 14 threads.
- Platform: They are part of the same platform, offering support for the same technologies like PCIe Gen4/5, Thunderbolt 4, and Wi-Fi 6E.
- Key Difference: The primary distinction lies in their clock speeds, which is a common differentiator within the same processor family.
Performance and Clock Speeds
Clock speed is the most significant differentiator between these two models. Higher clock speeds typically allow a processor to complete tasks faster, though real-world differences can vary based on system cooling and workload.
- Intel Core Ultra 7 255U: This model has higher base and maximum turbo frequencies. The P-cores can reach higher turbo speeds, which can benefit short-burst, single-threaded tasks like application loading or web browsing responsiveness.
- Intel Core Ultra 7 155U: This processor operates at slightly lower clock speeds across all core types. The performance difference in most everyday tasks is often minimal and may not be noticeable to the average user.
- Thermal Design Power (TDP): Both processors share the same base TDP range (typically around 15W), meaning their default power consumption and heat output targets are similar. The 255U’s higher clocks may be more dependent on the laptop’s thermal design to sustain performance.
Integrated Graphics and AI
The integrated graphics and AI capabilities are identical between these two processors, as they belong to the same generation and product tier.
- Graphics: Both feature the same Intel Arc graphics with a matching number of execution units (EUs). Gaming performance and content creation acceleration will be virtually the same between the two when used in systems with similar memory configurations and cooling.
- NPU (Neural Processing Unit): A key feature of the Core Ultra series is the inclusion of a dedicated NPU for AI acceleration. Both the 255U and 155U contain the same NPU, offering equivalent performance for AI-enhanced features like background blur in video calls, photo editing tools, and other on-device AI workloads.
Comparison Table: Intel Core Ultra 7 255U vs 155U
| Feature | Intel Core Ultra 7 255U | Intel Core Ultra 7 155U |
|---|---|---|
| Processor Cores | 12 Cores (2P+8E+2LP E-cores) | 12 Cores (2P+8E+2LP E-cores) |
| Threads | 14 Threads | 14 Threads |
| Max Turbo Frequency (P-Core) | Generally higher (e.g., 4.8 GHz) | Generally lower (e.g., 4.7 GHz) |
| Base Frequency (P-Core) | Generally higher | Generally lower |
| Integrated Graphics | Intel Arc Graphics (e.g., 8 Xe Cores) | Intel Arc Graphics (e.g., 8 Xe Cores) |
| NPU (AI Engine) | Yes | Yes |
| Lithography | Intel 4 | Intel 4 |
| Max Memory Support | DDR5-5600, LPDDR5/x-7467 | DDR5-5600, LPDDR5/x-7467 |
| Processor Base Power | Typically 15W | Typically 15W |
| Platform Features | Thunderbolt 4, PCIe Gen5/4, Wi-Fi 6E | Thunderbolt 4, PCIe Gen5/4, Wi-Fi 6E |
FAQ
What is the main difference between the Core Ultra 7 255U and 155U?
The main difference is clock speed. The Core Ultra 7 255U generally operates at slightly higher base and turbo frequencies than the 155U. Their core configuration, graphics, and feature sets are otherwise the same.
Will I notice a performance difference in everyday use?
For typical tasks like web browsing, office applications, and media consumption, the performance difference is often minimal and may not be perceptible. The difference might become more apparent in sustained, heavily threaded workloads or very short, single-threaded bursts if the laptop’s thermal design allows.
Do both processors have the same integrated graphics?
Yes. Both the Intel Core Ultra 7 255U and 155U feature the same Intel Arc graphics solution with an identical number of execution units, so gaming and creative application performance from the iGPU should be comparable.
Which one is more power-efficient?
Both share the same base TDP and architecture, so their power efficiency under similar loads is typically very close. The 155U, with its slightly lower clocks, might have a marginal advantage in some very light workloads, but system design and laptop manufacturer tuning play a larger role in overall battery life.
Final Thoughts
The Intel Core Ultra 7 255U and Core Ultra 7 155U are remarkably similar processors. The 255U represents a slightly higher-binned part with increased clock speeds, offering a potential edge in peak performance. In practice, the choice between them often comes down to the specific laptop models they are featured in. Factors like the device’s cooling solution, display quality, battery capacity, and overall build may have a more significant impact on the user experience than the minor clock speed difference between these two CPUs. When comparing laptops equipped with these processors, it is advisable to consider the entire system package rather than the CPU model alone.