Intel Core Ultra 5 338H

Intel Core Ultra 5 338H is a 12-thread mobile processor built on Intel’s 3 nm Panther Lake architecture, part of the Core Ultra Series 3. It targets thin-and-light laptops where a balance of compute throughput and power efficiency is critical, and its benchmark standing places it at the 50th percentile among all CPUs, indicating a squarely mid-pack performer rather than a flagship or entry-level part.

Single-Thread vs Multi-Thread Behavior

The Core Ultra 5 338H configuration is unusual: it offers 12 cores and 12 threads, meaning no Hyper-Threading or equivalent SMT. This directly shapes both single-thread and multi-thread behavior. With a base clock of 1.90 GHz and a boost clock of 4.70 GHz, the processor has a wide frequency headroom. The 4.70 GHz boost is the headline figure for lightly threaded workloads, where the scheduler can push a single core to its maximum. In contrast, the 1.90 GHz base clock is modest, and under heavy all-core loads, sustained frequency will depend heavily on the cooling solution and power limits of the host laptop.

For real-world workloads, this split matters. Single-thread performance drives everyday responsiveness, web browsing, and legacy software that cannot use many cores. The high boost clock suggests that the 338H will feel snappy in such tasks, matching or exceeding many desktop parts from a few generations ago in raw single-core speed. However, the lack of SMT means that multi-threaded performance is derived purely from physical cores. In productivity suites that scale well with thread count, such as video encoding or 3D rendering, the 338H will rely on its 12 physical cores alone, and the 50th percentile overall score reflects that this is a competent but not exceptional multi-threaded performer. The practical takeaway: expect strong single-core behavior for UI and latency-sensitive tasks, but do not expect the multi-threaded throughput of a 24-thread HX-series chip.

Power and Thermals

The 338H carries a 45 W TDP, which places it in the standard performance tier for mobile processors. This is a conventional figure for a mainstream laptop CPU, not an ultra-low-power part and not a high-end HX-class chip. A 45 W TDP implies that the processor requires a cooling solution with a heatpipe and fan, not a fanless design or a slim ultrabook chassis without active cooling. In practice, laptops housing this chip should sustain moderate all-core loads without immediate thermal throttling, provided the chassis has a reasonable thermal design.

The 3 nm process node from Intel is a key factor here. A smaller process generally improves power efficiency, allowing the 45 W budget to be spent on frequency rather than wasted as heat. The boost clock of 4.70 GHz at 45 W suggests that the silicon is capable of high frequencies at moderate power, which is a favorable sign for short bursts of performance. However, the base clock of 1.90 GHz hints that sustained all-core operation will likely settle well below the boost frequency to stay within the thermal envelope. For cooling, a capable dual-fan laptop cooler should suffice; there is no indication from the TDP that exotic liquid cooling or oversized vapor chambers are necessary. Users should still check laptop reviews for sustained performance, as the 45 W figure is a design point, not a guarantee of continuous operation at that level.

Platform and Compatibility

The processor uses the Intel BGA 2540 socket, which means it is soldered to the motherboard and not upgradeable. This is standard for mobile parts, and buyers should choose their laptop configuration carefully, as the CPU cannot be swapped later. The architecture is Panther Lake, and the generation is Ultra 5 (Panther Lake-H), indicating a high-performance mobile variant of the Panther Lake family.

Memory support is limited to LPDDR5X, running on a dual-channel bus with a maximum bandwidth of 136.5 GB/s. This is a high-bandwidth configuration typical of modern ultraportables, and it pairs well with the integrated Arc B370 graphics, which will share this memory. ECC memory is not supported, so this is not aimed at workstation reliability use cases. For PCIe, the CPU provides Gen 5 with 4 lanes (CPU only). This is a modest amount of PCIe connectivity; it is sufficient for a single fast NVMe SSD, but not for multiple Gen 5 devices or a discrete GPU requiring 8 or 16 lanes. The lack of a dedicated GPU path suggests that this processor is intended for integrated-graphics laptops or those with a low-power discrete GPU on a separate bus.

The integrated graphics are Arc B370, which is a notable inclusion. This provides a significant step up from older Intel UHD graphics in terms of media engine capabilities and gaming at low to medium settings. The 136.5 GB/s memory bandwidth is ample for the iGPU, reducing bottlenecks in texture-heavy workloads. Upgrade path is effectively nonexistent due to the BGA socket; the only upgrade consideration is the laptop itself, not the processor.

How It Compares

The nearest rival data is not provided in the fact pack, so a direct comparison to specific named competitors cannot be made. However, judging by the 50th percentile standing among all CPUs, the 338H sits at the midpoint of the market. This implies that in single-thread workloads, its 4.70 GHz boost clock likely puts it ahead of many older desktop and mobile parts with lower clocks, but behind the highest-clocked flagship mobile chips that reach higher boost frequencies. In multi-threaded workloads, the 12 threads put it in a competitive position against similarly sized parts, but it will lag behind processors with 16 or more threads, especially those with SMT enabled. Notably, the lack of SMT means that its 12-thread count is effectively its ceiling; a competitor with 6 cores and 12 threads would match it, while any 8-core/16-thread part would likely surpass it in multi-core rendering and compilation tasks. The Arc B370 iGPU is a differentiator against rivals without such a strong integrated graphics solution, offering a smooth experience for light gaming and hardware-accelerated video encoding. Overall, the 338H is a balanced mid-tier offering, not a specialist in any single metric.

Who Should Consider It

For gamers, the 338H is a reasonable choice if gaming is light or moderate. The Arc B370 integrated graphics can handle esports titles at 1080p with medium settings, and the strong single-thread performance ensures high frame rates in CPU-bound scenarios. However, for AAA gaming at high settings, a discrete GPU is mandatory, and the limited PCIe Gen 5 lanes (4 lanes CPU only) may constrain the performance of a high-end discrete GPU, though it is sufficient for typical mid-range mobile GPUs. For content creators, the 12 threads and 18 MB of shared L3 cache provide adequate performance for photo editing and 1080p video editing, but 4K rendering or heavy 3D animation will be slower than on higher-threaded chips. The 136.5 GB/s memory bandwidth is a plus for memory-intensive tasks like large dataset manipulation in spreadsheets or data science. For office productivity, the 338H is more than adequate; the high boost clock ensures snappy spreadsheet and document handling, and the 45 W TDP means it can sustain these lighter loads without significant fan noise. The lack of ECC memory disqualifies it for mission-critical server-style workloads. In summary, this chip is best suited for a mainstream laptop user who wants strong single-thread performance, decent multi-threading for occasional heavy tasks, and a capable iGPU, without needing extreme multi-core throughput or upgradeability.

FAQ

Q: Does the Intel Core Ultra 5 338H support Hyper-Threading?

A: No. It has 12 cores and 12 threads, indicating that SMT is not enabled. Each core handles one thread.

Q: What is the maximum memory bandwidth available to this processor?

A: The memory bus is dual-channel LPDDR5X, providing a maximum bandwidth of 136.5 GB/s.

Q: Can I upgrade the CPU in a laptop with this processor?

A: No. The processor uses the Intel BGA 2540 socket, which is soldered to the motherboard and is not user-replaceable or upgradeable.

Q: What is the boost clock speed for single-threaded workloads?

A: The maximum boost clock is 4.70 GHz. The base clock is 1.90 GHz, and the processor can reach the higher frequency under appropriate thermal and power conditions.

Q: Does this processor have integrated graphics, and if so, what type?

A: Yes, it includes the Arc B370 integrated graphics. This provides a functional GPU solution for display output and light gaming without a separate graphics card.

Q: Is this processor compatible with ECC memory?

A: No, ECC memory is not supported. The processor is designed for standard consumer LPDDR5X memory modules.