Quick Answer
The Intel Core i7-1355U and Core i5-1235U are both 15-watt mobile processors for thin-and-light laptops. The i7-1355U generally offers higher clock speeds, more cache, and superior integrated graphics performance, making it better suited for more demanding multi-threaded and creative workloads. The Core i5-1235U provides capable performance for everyday productivity and is typically found in more budget-conscious devices.
Intel Core i7 1355U vs Intel Core i5 1235U: Full Comparison
Introduction
Choosing a laptop often involves understanding the processor at its heart. For users considering modern thin-and-light notebooks, the Intel Core i7-1355U and Core i5-1235U are two common options. This comparison breaks down their specifications, performance characteristics, and typical use cases to help clarify their differences. By examining aspects like core architecture, graphics, and power efficiency, you can better determine which CPU aligns with your computing needs.
Architecture and Core Specifications
Both processors share a similar foundational design but differ in key specifications that impact performance.
- Process & Core Design: Both CPUs are built on Intel’s hybrid architecture, combining Performance-cores (P-cores) and Efficient-cores (E-cores). They are manufactured on the Intel 7 process node.
- Core/Thread Count: The Core i7-1355U features 10 cores (2 P-cores + 8 E-cores) and 12 threads. The Core i5-1235U also has 10 cores (2 P-cores + 8 E-cores) and 12 threads. Their core configuration is identical.
- Clock Speeds: This is a primary differentiator. The i7-1355U has higher maximum turbo frequencies, with its P-cores reaching up to 5.0 GHz compared to 4.4 GHz on the i5-1235U. This typically results in better single-threaded performance.
- Cache: The i7-1355U has a larger 12MB Intel Smart Cache, while the i5-1235U has 12MB. The i7’s cache is often more performant.
Graphics Performance
The integrated graphics solution is another area where these processors diverge.
- Core i7-1355U: It is equipped with Intel Iris Xe Graphics (96 Execution Units or EUs). This GPU offers noticeably better performance for light gaming, photo editing, and video playback compared to the i5’s solution.
- Core i5-1235U: It features Intel UHD Graphics (80 EUs). This is a capable integrated GPU for everyday tasks and driving high-resolution displays but is less performant in graphics-intensive applications than the Iris Xe solution.
- Media Engine: Both support modern codecs like AV1 decode, which is beneficial for efficient video streaming.
Performance and Use Cases
The performance difference translates into recommended use cases for each processor.
- Core i7-1355U: Better suited for users who run more demanding applications, such as programming IDEs, statistical software, light video editing, or multitasking with many browser tabs and office applications simultaneously. The higher clocks and better graphics provide more headroom.
- Core i5-1235U: An excellent choice for general productivity, including web browsing, document editing, video conferencing, and media consumption. It handles everyday tasks with ease and is a common choice for business and student laptops.
- Thermal Design Power (TDP): Both have a base TDP of 15 watts, meaning they are designed for similar cooling systems and laptop form factors. Actual performance can vary significantly based on the laptop’s thermal design and power limits.
Platform Features and Connectivity
Both CPUs support a modern set of platform features, with minor generational differences.
- Memory Support: Both support DDR4 and LPDDR5/x memory types, with dual-channel being typical for optimal performance.
- PCI Express & Connectivity: The i7-1355U supports PCIe 4.0, while the i5-1235U supports PCIe 4.0. Both integrate Wi-Fi 6E and Thunderbolt 4/USB4 support, though the specific implementation depends on the laptop manufacturer.
- Generation: The i7-1355U is part of Intel’s 13th Gen (Raptor Lake), while the i5-1235U is part of the 12th Gen (Alder Lake). The 13th Gen often brings refinements in efficiency and performance.
Comparison Table
| Feature | Intel Core i7-1355U | Intel Core i5-1235U |
|---|---|---|
| Processor Generation | 13th Gen (Raptor Lake) | 12th Gen (Alder Lake) |
| Total Cores / Threads | 10 Cores (2P + 8E) / 12 Threads | 10 Cores (2P + 8E) / 12 Threads |
| Max Turbo Frequency | Up to 5.0 GHz | Up to 4.4 GHz |
| Intel Smart Cache | 12 MB | 12 MB |
| Integrated Graphics | Intel Iris Xe Graphics (96 EUs) | Intel UHD Graphics (80 EUs) |
| Base TDP | 15 W | 15 W |
| Memory Support | DDR4, LPDDR5/x | DDR4, LPDDR5 |
| PCI Express Support | PCIe 4.0 | PCIe 4.0 |
| Typical Use Case | Demanding multitasking, light content creation, better integrated graphics performance | General productivity, office tasks, web browsing, media consumption |
Frequently Asked Questions (FAQ)
What is the main difference between the i7-1355U and i5-1235U?
The primary differences are the higher maximum clock speeds and the more powerful Iris Xe integrated graphics in the Core i7-1355U. While they share the same core count, the i7 is designed to deliver better performance in both single-threaded and graphics-intensive tasks.
Is the Core i7-1355U significantly better for gaming?
For integrated graphics gaming, the Iris Xe GPU in the i7-1355U is generally more capable than the UHD Graphics in the i5-1235U. It can handle older or less demanding titles at lower settings more smoothly. However, neither is intended for serious gaming; a laptop with a discrete GPU is typically recommended for that purpose.
Which processor is more power-efficient?
Both have the same 15W base TDP and are designed for similar efficiency in thin-and-light laptops. Real-world battery life depends more on the laptop’s overall design, display, and battery capacity than on the small efficiency differences between these two specific CPUs.
Should I choose a laptop with an i7-1355U for programming or software development?
The Core i7-1355U can be a good fit for programming, especially for compiling code, running virtual machines, or using complex IDEs, thanks to its higher turbo speeds. For most standard development work, the Core i5-1235U is also perfectly capable, and the choice may come down to other laptop features or budget.
Final Thoughts
The Intel Core i7-1355U and Core i5-1235U offer distinct tiers of performance within the same 15-watt laptop category. The i7-1355U provides a performance uplift, particularly in single-threaded tasks and graphics, making it a consideration for users with more intensive workflows. The i5-1235U remains a highly competent processor that capably handles the vast majority of everyday computing needs. The final decision often hinges on assessing the specific software requirements against the typical performance characteristics of each CPU, as well as the other components and build quality of the laptop they are housed in.