Intel Core i9-13900HX vs Intel Core Ultra X9 388H Comparison

The Verdict

The recorded data splits these two mobile processors into distinct roles. The Intel Core i9-13900HX wins 10 of 17 head-to-head benchmarks, while the Intel Core Ultra X9 388H takes 7. The i9-13900HX dominates heavily threaded workloads, with its Cinebench R23 multicore score of 27900 sitting 47.5% above the Ultra X9 388H’s 18911. The Ultra X9 388H counters in single-threaded tasks, notably a Cinebench R23 single-core score of 2200.5 versus 2056, a 6.6% edge. The database’s average benchmark scores place the i9-13900HX at 46098 (89th percentile) and the Ultra X9 388H at 44466 (88th percentile), a 3.7% gap that is modest relative to the multicore chasm. Users who need sustained multi-core throughput, such as rendering or compilation, should choose the i9-13900HX. Users prioritizing single-thread responsiveness, lower power draw, and newer process technology should choose the Ultra X9 388H, which also offers a more capable integrated GPU and higher memory bandwidth.

Architecture Differences

The i9-13900HX is built on Intel’s Raptor Lake-HX architecture, using a 10 nm process at Intel’s own foundry. It packs 24 cores and 32 threads, with a base clock of 2.20 GHz and a boost clock of 5.40 GHz. Its thermal design power is 55 watts. The cache hierarchy includes 80 KB of L1 per core, 2 MB of L2 per core, and 36 MB of shared L3. The die size is 257 mm². Memory support covers DDR4 and DDR5 in a dual-channel configuration, and ECC memory is supported. PCIe connectivity is Gen 5 with 20 lanes from the CPU. The integrated graphics are UHD Graphics 770. This chip uses socket Intel BGA 1964, is multiplier-unlocked, and carries a launch MSRP of $668.

The Ultra X9 388H uses Intel’s Panther Lake architecture on a 3 nm process, also from Intel’s foundry. It has 16 cores and 16 threads, meaning no hyper-threading. Base clock is 2.10 GHz, boost clock is 5.10 GHz, and thermal design power is 25 watts. Cache differs substantially: 192 KB of L1 per core, 3 MB of L2 per core, and 18 MB of shared L3. Memory support is LPDDR5X only, dual-channel, with a recorded memory bandwidth of 153.6 GB/s, and ECC is not supported. PCIe is Gen 5 but only 4 lanes from the CPU. The integrated GPU is Arc B390. The socket is Intel BGA 2540, the multiplier is locked, and no launch MSRP is recorded. The process node advantage (3 nm versus 10 nm) explains the Ultra X9 388H’s higher per-core cache and lower power envelope, while the i9-13900HX leverages core count and thread count for raw throughput.

Head-to-Head Benchmarks

The most decisive win for the i9-13900HX is Cinebench R15 multicore, where it scores 4494.5 versus 2955, a 52.1% advantage. Cinebench R23 multicore shows a similar pattern: 27900 versus 18911, a 47.5% margin. PassMark integer math is the largest single delta, with the i9-13900HX at 156175 versus 90882, a 71.8% lead. Data compression also favors the i9-13900HX strongly: 531224 versus 361763, a 46.8% gap. Random string sorting is another clear win, 59199 versus 44010, a 34.5% edge. The i9-13900HX also wins PassMark multithread (43062 versus 36811, 17%), Cinebench R20 multicore (14836 versus 13101, 13.2%), data encryption (32130 versus 28490, 12.8%), and extended instructions (30550 versus 29943, 2%). Cinebench R20 single-core goes to the i9-13900HX as well, 2094 versus 1849, a 13.3% margin.

The Ultra X9 388H wins the remaining benchmarks. PassMark find prime numbers shows a dramatic reversal: 358 versus 190, a 46.9% advantage for the Ultra X9 388H. PassMark physics favors the Ultra X9 388H, 3226 versus 2645, an 18% lead. Floating point math is close, 112550 versus 110470, a 1.8% edge. Single-threaded tests consistently favor the Ultra X9 388H: PassMark single-thread scores 4280 versus 4081, a 4.6% lead, and Cinebench R23 single-core scores 2200.5 versus 2056, a 6.6% margin. Cinebench R15 single-core also goes to the Ultra X9 388H, 309.5 versus 296, a 4.4% difference. The overall win count (10 versus 7) masks the magnitude of the multicore deltas, which are far larger than the single-thread deltas.

FAQ

Q: Which processor is faster in multi-core workloads?

A: The Intel Core i9-13900HX is significantly faster. Cinebench R23 multicore shows 27900 versus 18911, a 47.5% difference. Cinebench R15 multicore shows 4494.5 versus 2955, a 52.1% margin. PassMark multithread also favors the i9-13900HX, 43062 versus 36811, a 17% lead.

Q: Which processor wins in single-threaded tests?

A: The Intel Core Ultra X9 388H wins every single-thread benchmark in the head-to-head set. PassMark single-thread scores 4280 versus 4081, a 4.6% edge. Cinebench R23 single-core scores 2200.5 versus 2056, a 6.6% margin. Cinebench R15 single-core also favors the Ultra X9 388H, 309.5 versus 296, a 4.4% difference.

Q: How does the core and thread count differ?

A: The i9-13900HX has 24 cores and 32 threads, while the Ultra X9 388H has 16 cores and 16 threads. The i9-13900HX also has a higher boost clock of 5.40 GHz versus 5.10 GHz, and a higher base clock of 2.20 GHz versus 2.10 GHz.

Q: What are the cache differences?

A: The i9-13900HX has 80 KB of L1 per core, 2 MB of L2 per core, and 36 MB of shared L3. The Ultra X9 388H has 192 KB of L1 per core, 3 MB of L2 per core, and 18 MB of shared L3. The Ultra X9 388H has more L1 and L2 per core, while the i9-13900HX has double the shared L3.

Q: Which processor supports more PCIe lanes?

A: The i9-13900HX supports Gen 5 with 20 lanes from the CPU. The Ultra X9 388H supports Gen 5 but only 4 lanes from the CPU. This affects expandability for discrete GPUs and high-speed storage.

Q: What is the thermal design power difference?

A: The i9-13900HX has a thermal design power of 55 watts, while the Ultra X9 388H has a thermal design power of 25 watts. The Ultra X9 388H draws less power, which may be relevant for thin-and-light laptop designs.

Where Each One Wins

The Intel Core i9-13900HX is the clear choice for throughput-bound applications. Its 24 cores and 32 threads translate directly into wins in Cinebench R15, R20, and R23 multicore tests, with margins ranging from 13.2% to 52.1%. PassMark integer math (71.8% lead), data compression (46.8% lead), and random string sorting (34.5% lead) confirm that CPU-intensive computational work favors this part. The larger 36 MB L3 cache likely helps in workloads that reuse data across many threads. It also supports DDR4 and DDR5 memory and ECC, which broadens its system integration options. The i9-13900HX is the pick for content creation, software compilation, scientific computing, and other heavily threaded professional tasks where the 55-watt thermal design power is acceptable.

The Intel Core Ultra X9 388H wins in efficiency-oriented and single-thread-sensitive scenarios. Its 25-watt thermal design power is less than half that of the i9-13900HX, making it suitable for thinner chassis with limited cooling. It wins PassMark physics (3226 versus 2645), which measures a mix of single-thread and moderate multi-thread performance, and PassMark find prime numbers (358 versus 190, a 46.9% lead), indicating strong per-core integer throughput. Floating point math is also slightly better, 112550 versus 110470. The Ultra X9 388H’s 3 nm process and larger per-core L1 and L2 caches (192 KB and 3 MB per core) support its single-thread dominance. The integrated Arc B390 GPU and 153.6 GB/s memory bandwidth make it the stronger choice for integrated graphics workloads, although the benchmark data does not include GPU-specific tests. For users who prioritize battery life, portability, and snappy single-thread response over raw multi-core power, the Ultra X9 388H is the appropriate selection.

The database’s percentile rankings are close: 89th for the i9-13900HX and 88th for the Ultra X9 388H. Average benchmark scores differ by only 3.7% (46098 versus 44466). This indicates that for mixed workloads, the two processors are broadly comparable. The i9-13900HX’s nearest rival is the Intel Core Ultra 5 235 with a 0.1% delta, while the Ultra X9 388H sits near the AMD Ryzen 5 7500X3D with a 0.2% delta. In practice, the choice hinges on whether the workload is multi-threaded (i9-13900HX) or single-threaded and power-constrained (Ultra X9 388H).