Intel® Core™ Ultra X9 388H

The Intel Core Ultra X9 388H is a mobile processor with a hybrid 16-core layout (4 performance cores + 8 efficiency cores) and 16 threads, built on the Panther Lake architecture. It launched in Jan 2026. Clocks run from 2.1 GHz base to 5.1 GHz boost. A 18-MB L3 cache backs the cores (2.7 MB per core). It addresses LPDDR5X memory up to 96 GB across 2 channels. The chip drops into the FCBGA2540 socket and exposes PCIe 5.0 (12 lanes). Rated TDP is 25 W. Notable platform capabilities: Extended Page Tables (EPT), Control-flow Enforcement (CET).

The Intel Core Ultra X9 388H scores 4,274 in single-core performance and 36,005 in multi-core performance (PassMark CPU Mark ratings). From those two ratings Feex computes 12,405 for overall performance, 29,387 for productivity performance, 27,496 for creator performance, 41,406 for engineering performance and 21,823 for gaming performance. Its multi-core throughput works out to 2,250 per core, 2,250 per thread and 1,440 per watt. Its computed efficiency index is 2,481. Its performance index is 154, so its overall performance is 54% above the Intel Core i5-12400 (index 100). Each bar shows the score as a share of a reference ceiling, which is the larger of the 99th-percentile score across the Feex CPU database and a fixed baseline.

Scores for individual PassMark CPU Mark test categories. Higher is better. These are measured test scores, not computed from the single-core and multi-core ratings.

In the individual workload tests the Intel Core Ultra X9 388H scores 90,528 in integer math, 111,947 in floating-point math, 360,971 in compression, 28,381 in cryptography, 3,215 in physics simulation, 29,839 in vector SIMD, 358 in the prime sieve and 43,887 in sorting. Higher is better. Compared with the Intel Core i5-12400, it is 54% above in integer math, 144% above in floating-point math, 58% above in compression, 147% above in cryptography, 195% above in physics simulation, 92% above in vector SIMD, 434% above in the prime sieve and 94% above in sorting. Each bar shows the score as a share of that workload's reference ceiling, the larger of the 99th-percentile score across CPUs with a recorded value and a fixed baseline.

The Intel Core Ultra X9 388H has 16 physical cores and runs 16 logical threads. It uses a hybrid layout of 4 performance cores and 8 efficiency cores. It does not support simultaneous multithreading, so its thread count equals its core count. It runs at a base clock of 2.10 GHz and boosts up to 5.10 GHz.

The Intel Core Ultra X9 388H is a mobile processor, belongs to the Intel Core Ultra family, uses the Panther Lake architecture, carries the codename Panther Lake and is manufactured on a 2 nm process. It launched in Jan 2026.

The Intel Core Ultra X9 388H has 1.56 MB of L1 cache, 24 MB of L2 cache and 18 MB of L3 cache. That adds up to about 43.6 MB of cache, or 2.72 MB per core.

The Intel Core Ultra X9 388H has a 3-level cache hierarchy: L1 at 1.6 MB, L2 at 24 MB and L3 at 18 MB. L2 is the largest level and makes up about 55% of the cache listed here.

The Intel Core Ultra X9 388H supports LPDDR5X memory, addresses up to 96 GB of memory and uses 2 memory channels. It does not support DDR5 and DDR4 memory.

The Intel Core Ultra X9 388H includes integrated graphics (Intel Arc B390 GPU) and clocks the graphics up to 2.50 GHz.

The Intel Core Ultra X9 388H uses the FCBGA2540 socket, supports PCI Express 5.0 and provides up to 12 PCIe lanes.

The Intel Core Ultra X9 388H has a rated TDP of 25 W.

Instruction sets, security, virtualization, AI acceleration and OS readiness. Features are listed as supported, explicitly not supported, or not recorded; a feature that is not recorded is not the same as unsupported.

The Intel Core Ultra X9 388H is also identified by the model number 388H and the processor number 388H.

After an audit, 1 value was corrected on the Intel Core Ultra X9 388H record. Each change is listed with its old value, new value, rule and sources.

• L2 cache (total): 3,072 KB → 24,576 KB. Rule: L2 cache was stored per core. stored equals the per-P-core size in PassMark "4 x 3072 KB". Sources: Vendor page (intel.com); PassMark: Intel Core Ultra X9 388H; Wikipedia: List of Intel Core mobile processors (revision 1369925615).

The audit log is public: all changes for this CPU, the corrections overview and the method.

Feex has recorded 62% of the specifications it tracks for the Intel Core Ultra X9 388H. Values Feex does not hold are shown as "Not recorded" rather than estimated.

Not recorded: Core Configuration: All-Core Boost and Unlocked Multiplier. Architecture & Generation: ISA Family and Market Status. Cache: L2 Cache (per Core) and L4 Cache. Memory Support: Memory Bandwidth, ECC Memory and Max Memory Speed. Graphics: Graphics Base Clock, Execution Units, Display Outputs and Max Video Memory. Platform & Compatibility: Package and Package Size. Power & Thermals: Base Power, Maximum Turbo Power, Configurable TDP (Min), Configurable TDP (Max), Max Junction Temperature and Tcase. Physical & Manufacturing: Transistor Count, Die Size, Die Count, Foundry and Launch Price. Naming & Aliases: SKU and Part Number.

Processors that use the same FCBGA2540 socket as the Intel Core Ultra X9 388H and have the closest multi-core scores in the Feex database include Intel Core Ultra 9 386H, Intel Core Ultra 7 366H, Intel Core Ultra 7 356H, Intel Core Ultra X7 358H and Intel Core Ultra X7 368H.