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Intel Core Ultra X7 358H specifications and in-depth review

Intel Core Ultra X7 358H

Manufacturer: Intel

The Intel Core Ultra X7 358H is a laptop processor built around a hybrid core architecture that combines multiple clusters of cores running at different base frequencies. It supports big.LITTLE technology, distributing workloads across performance and efficiency cores to balance processing demands against power consumption within its 25W thermal envelope.

On the memory side, the processor works with DDR5 RAM at up to 9600 MHz across two channels, with a maximum supported capacity of 96GB. Its 18MB L3 cache and a turbo clock speed reaching 4.8 GHz complement the 16 available threads. The integrated Arc B390 graphics unit runs at up to 2500 MHz and supports DirectX 12 Ultimate, OpenGL 4.6, OpenCL 3, and up to four simultaneous displays. Connectivity is handled through PCIe 5, and the chip includes a broad set of instruction sets such as AVX2, AES, FMA3, and SSE 4.2.

Pros
  • Supports DDR5 memory at speeds up to 9600 MHz, allowing for fast data throughput in a laptop form factor
  • The integrated Arc B390 GPU can drive up to four displays simultaneously, offering flexible multi-monitor setups
  • PCIe 5 support enables compatibility with the latest high-bandwidth storage and peripheral devices
  • A maximum supported RAM capacity of 96GB provides substantial headroom for memory-heavy workloads
  • The 18MB L3 cache helps reduce data fetch latency across the processor's 16 threads
  • Includes hardware AES acceleration and NX bit support, adding a layer of security at the silicon level
Cons
  • The 25W TDP places firm constraints on sustained performance in thermally limited laptop chassis
  • Base clock speeds across all core clusters are relatively modest, with none exceeding 1.9 GHz before turbo kicks in
  • Turbo Boost version 2 is an older implementation of the turbo frequency scaling technology
  • Dual-channel memory configuration limits peak memory bandwidth compared to platforms with wider memory bus support
Who is this for?

This processor is well-suited to users who need a capable laptop for memory-intensive and multithreaded workloads, such as software development, content creation, or data processing, where the 16-thread configuration, 18MB L3 cache, and up to 96GB of DDR5 RAM can be put to practical use. The integrated Arc B390 GPU with support for up to four simultaneous displays makes it a reasonable fit for professionals who rely on expanded screen real estate for productivity. Users who also need light GPU compute tasks or general graphics workloads will benefit from the DirectX 12 Ultimate and OpenCL 3 support without requiring a discrete graphics solution.

Who is this NOT for?

This processor is not well-suited for users who demand sustained high-throughput performance in thermally constrained environments, as the 25W TDP limits how long peak performance can be maintained in slim or passively cooled laptop designs. Users looking for demanding gaming or GPU-accelerated workloads will likely find the integrated Arc B390 insufficient for titles or applications that require dedicated graphics memory and higher compute throughput. Similarly, the modest base clock speeds across all core clusters mean that workloads relying on strong single-threaded performance outside of turbo conditions may feel constrained.

General info:

Type Laptop
Has integrated graphics ✓
Thermal Design Power (TDP) 25W
CPU temperature 100 °C
PCI Express (PCIe) version 5
Supports 64-bit ✓

The Intel Core Ultra X7 358H is a laptop processor with a Thermal Design Power (TDP) of 25W and a maximum CPU temperature of 100 °C. It includes integrated graphics and fully supports 64-bit computing. Connectivity is handled through PCI Express 5, the latest PCIe generation available at the time of its release.

Performance:

CPU speed 4 x 1.9 & 8 x 1.5 & 4 x 1.5 GHz
CPU threads 16 threads
turbo clock speed 4.8GHz
L3 cache 18 MB
Uses big.LITTLE technology ✓
Turbo Boost version 2

The processor uses big.LITTLE technology to distribute workloads across three core clusters running at 1.9 GHz (4 cores), 1.5 GHz (8 cores), and 1.5 GHz (4 cores), totaling 16 threads across all cores. With Turbo Boost version 2, clock speeds can scale up to a turbo frequency of 4.8 GHz under demanding conditions. An 18 MB L3 cache supports faster data access across these cores, helping to reduce latency during varied workloads.

Benchmarks:

Integrated graphics:

GPU name Arc B390
GPU turbo 2500 MHz
DirectX version DirectX 12 Ultimate
supported displays 4
OpenGL version 4.6
OpenCL version 3

The integrated graphics solution is the Arc B390, which operates at a turbo frequency of 2500 MHz and supports up to four displays simultaneously. It is compatible with DirectX 12 Ultimate, alongside OpenGL 4.6 and OpenCL 3, covering a broad range of graphics and compute workloads from standard rendering to general-purpose GPU tasks.

Memory:

RAM speed (max) 9600 MHz
DDR memory version 5
memory channels 2
maximum memory amount 96GB

The processor supports DDR5 memory running at speeds of up to 9600 MHz across a dual-channel configuration. It can accommodate a maximum of 96GB of RAM, providing substantial headroom for memory-intensive workloads on a laptop platform.

Features:

instruction sets MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, SSE 4.2
Has NX bit ✓

The processor supports a broad set of instruction sets including AVX2, FMA3, and AES, alongside MMX, F16C, AVX, SSE 4.1, and SSE 4.2, enabling a wide range of computational tasks from vectorized math operations to hardware-accelerated encryption. It also includes the NX bit, a hardware security feature that helps prevent certain types of malicious code execution by marking memory regions as non-executable.

Final Verdict

The Intel Core Ultra X7 358H is a well-rounded laptop processor that brings together a capable set of specifications for users who need a versatile mobile workstation. Its support for DDR5 memory at up to 9600 MHz with a 96GB ceiling, combined with PCIe 5 connectivity and an integrated Arc B390 GPU capable of driving four displays, gives it a practical breadth of capability across productivity, light graphics, and compute workloads. The 25W thermal envelope and modest base clocks are inherent trade-offs of its laptop-focused design, which means it is best appreciated in scenarios that align with its architecture rather than pushed into sustained heavy loads. For users whose workflows fit within those boundaries, the Core Ultra X7 358H represents a thoughtfully specified option in the mobile CPU segment.