Intel Core Ultra 7 355 vs Core Ultra X7 358H: Performance, Graphics, and Power Consumption Comparison

Intel Core Ultra 7 355 and Core Ultra X7 358H belong to the Panther Lake generation, but occupy different tiers in the mobile lineup. The X7 358H is significantly faster in multi-threaded tasks and features the powerful Arc B390 graphics. Core Ultra 7 355 is designed for simpler configurations where moderate cooling requirements, support for larger memory capacity, and avoiding overspending on performance that won't be utilized are more important.

The difference between the processors is not limited to an additional 100 MHz. The higher model has double the cores, a threefold larger graphics unit, and an increased turbo limit of 80 watts.

Key Differences

Both chips are manufactured using Intel's 18A process and have four performance cores. However, X7 358H also gains eight standard E-cores, which are absent in the Core Ultra 7 355.

Similar Frequencies, But Different Multi-Threaded Speed

In browsers, office applications, and launching applications, the difference will be relatively small. The max frequency of P-cores is 4.7 GHz for Core Ultra 7 355 and 4.8 GHz for X7 358H. Therefore, the laptop's performance under light load is more dependent on cooling, storage, memory, and the manufacturer's settings.

During prolonged full-core loads, the situation changes. Core Ultra 7 355 has four P-cores and four low-power LP-E-cores. The X7 358H adds eight E-cores, with cache volume increased from 12 to 18 MB. This processor is better suited for rendering, compiling, video encoding, and heavy multitasking.

The difference is confirmed by comparing two versions of Dell XPS 14. In Geekbench 6.7 Multi-Core, the model with X7 358H scored 17,121 points against 11,394 for Core Ultra 7 355-an advantage of about 50%. In the single-threaded test, the gap was significantly smaller: 2927 vs. 2701 points, or about 8%. The results of a specific laptop cannot be generalized to all models, but they clearly demonstrate the nature of the differences between processors.

Arc B390 - The Main Advantage of X7 358H

The most significant difference between the processors lies in their integrated graphics. Core Ultra 7 355 is equipped with a basic Intel Graphics GPU featuring four Xe-cores and a claimed performance of 40 TOPS in INT8 operations. Such graphics are sufficient for system interface, video playback, basic image editing, and less demanding gaming.

The Core Ultra X7 358H comes with Arc B390, featuring 12 Xe-cores and a performance of 122 TOPS. The frequency of both GPUs reaches 2.5 GHz, so the advantage of the upper model is primarily due to the threefold number of graphics units. This does not imply a threefold difference in frame rates, but it elevates the X7 358H into a different class of integrated graphics.

Arc B390 is better suited for gaming, video editing, image processing, and GPU-accelerated applications. It allows for the construction of a powerful laptop without a separate graphics card and its own video memory. However, powerful integrated graphics still require efficient cooling and utilize part of the overall memory bandwidth.

The primary limitation of the Core Ultra 7 355 remains its four Xe-cores. Purchasing a laptop with this processor for serious gaming performance is not advisable.

Nearly Identical NPU

In terms of neural processor capabilities, there is hardly any difference: 49 TOPS for Core Ultra 7 355 and 50 TOPS for X7 358H. Both are suitable for local acceleration of compatible AI features and Windows Studio effects. It is pointless to overpay for an additional 1 TOPS of NPU. The advantage of the X7 in AI applications appears only where programs can leverage the more powerful Arc B390.

Memory and Power Consumption

Core Ultra 7 355 supports up to 128 GB of DDR5-6400 or LPDDR5X-7467. The X7 358H has a maximum capacity limited to 96 GB, but offers the faster LPDDR5X-9600, which is beneficial for Arc B390.

Support for standard DDR5 allows manufacturers the flexibility to use removable memory modules in laptops with Core Ultra 7 355. However, the presence of slots depends on the specific device: a manufacturer may install soldered memory even when the processor supports DDR5.

The base power of both models is 25 W, but the maximum turbo limit varies: 55 W for Core Ultra 7 355 and 80 W for X7 358H. Under comparable settings, the junior chip imposes lower peak cooling requirements, but this does not guarantee significantly better battery life.

In tests of identical Dell XPS 14 units, the difference in power consumption under established processor load was significantly less than the difference in performance. Consequently, battery life should be evaluated based on reviews of specific laptops, not solely on the processor index.

Which Processor to Choose

Core Ultra 7 355 is more rational when the laptop is needed for:

• Document work, browsing, and video calls;
• Studying and everyday tasks;
• Periodic photo and video editing;
• Configurations with a discrete graphics card;
• Installing more than 96 GB of RAM.

Core Ultra X7 358H justifies the additional cost in scenarios involving:

• Gaming without a discrete graphics card;
• Editing and rendering;
• Compiling large projects;
• Heavy multitasking;
• GPU-accelerated applications.

Conclusion

Core Ultra 7 355 is not just a slightly slower version of X7 358H. It is a processor with a different configuration: it has half the cores and significantly weaker integrated graphics, but higher maximum memory capacity and lower peak power limit.

If two comparable laptops differ in price slightly, the Core Ultra X7 358H offers much greater CPU and GPU performance headroom. For documents, browsing, and video calls, this headroom will remain untapped-in such tasks, Core Ultra 7 355 does the same work without the need to overpay for eight additional cores and Arc B390.