AMD Ryzen 9 9955HX vs Intel Core Ultra X9 388H Comparison

Where Each One Wins

The AMD Ryzen 9 9955HX and Intel Core Ultra X9 388H are both 16-core mobile processors, but they are built for entirely different workloads. The recorded data shows a clear split: the AMD part wins 12 of the 15 head-to-head benchmarks, while the Intel part takes only 3. That dominance is not subtle.

The Ryzen 9 9955HX wins every multi-threaded rendering test by a wide margin. In Cinebench R23 multi-core, it scores 37159 against 18911 for the Intel chip, a 96.5% advantage. The R15 multi-core test tells the same story: 5905 versus 2955, a 99.8% gap. This is a processor that crushes heavily threaded workloads.

The AMD part also wins in data processing tasks. PassMark data compression shows 731998 versus 361763, a 102.3% lead. Integer math goes even further: 212598 versus 90882, a 133.9% advantage. Extended instructions score 57946 against 29943, a 93.5% lead. Random string sorting follows with 77890 versus 44010, a 77% margin. Data encryption shows 37330 versus 28490, a 31% win. Floating point math is closer but still AMD: 136682 versus 112550, a 21.4% lead.

The Intel Core Ultra X9 388H wins in three specific areas. PassMark find prime numbers scores 358 versus 287, a 19.8% advantage for Intel. PassMark physics shows 3226 versus 2720, a 15.7% win. The third Intel victory is in Cinebench R23 single-core, where it scores 2200.5 against 2174, a slim 1.2% edge. The R15 single-core test goes to AMD at 336 versus 309.5, an 8.6% win, and PassMark single-thread also favors AMD at 4393 versus 4280, a 2.6% margin.

The Verdict

The data points to two very different use cases. The AMD Ryzen 9 9955HX is the choice for sustained multi-core workloads: rendering, compilation, data processing, encryption, and any task that scales across many threads. Its 32 threads versus the Intel chip's 16 threads is the structural reason behind the massive multi-core gaps. The average benchmark score for the AMD part is 91199, placing it in the 96th percentile of all CPUs. The Intel part averages 44466, in the 88th percentile.

The Intel Core Ultra X9 388H wins in prime number finding and physics simulations. Those are specific workloads that respond to its per-core architecture rather than raw thread count. Its single-core Cinebench R23 result is also marginally ahead. But those wins are narrow compared to the AMD part's multi-core blowouts. The Intel chip's nearest rivals include the AMD Ryzen 5 7500X3D (0.2% behind) and the Intel Core i9-13950HX (0.3% ahead), which puts its performance class in a much lower tier.

For anyone running heavily threaded software, the AMD Ryzen 9 9955HX is the clear pick. For workloads that favor prime number calculations or physics engines, the Intel part has a measurable edge. The scale of the AMD wins, however, suggests that the Ryzen 9 9955HX is the more versatile processor overall.

Head-to-Head Benchmarks

The largest single win for the AMD Ryzen 9 9955HX comes in PassMark integer math. The 212598 score against 90882 represents a 133.9% delta, meaning the AMD part more than doubles the Intel result. This is a direct consequence of having twice the threads and a much larger shared L3 cache.

Data compression is nearly as lopsided. The AMD part scores 731998 versus 361763, a 102.3% lead. This test benefits from the 64 MB of shared L3 cache on the AMD chip, which is more than three times the 18 MB on the Intel part. The R15 multi-core test shows a 99.8% delta, while R23 multi-core shows 96.5%. Both rendering tests confirm the same pattern: the AMD chip has roughly double the multi-threaded throughput.

The extended instructions test shows a 93.5% lead for AMD (57946 versus 29943). Random string sorting shows a 77% lead (77890 versus 44010). PassMark multithread shows a 52.6% lead (56171 versus 36811). Data encryption shows a 31% lead (37330 versus 28490). Floating point math shows a 21.4% lead (136682 versus 112550). Even single-threaded PassMark favors AMD by 2.6% (4393 versus 4280).

The Intel wins are more modest in scale. Prime number finding shows 358 versus 287, a 19.8% advantage. Physics shows 3226 versus 2720, a 15.7% advantage. The Cinebench R23 single-core win is just 1.2% (2200.5 versus 2174). These are the only three benchmarks where the Intel chip comes out ahead, and none of them approach the magnitude of the AMD multi-core victories.

FAQ

Q: Which processor has more threads?

A: The AMD Ryzen 9 9955HX has 32 threads, while the Intel Core Ultra X9 388H has 16 threads. Both have 16 cores.

Q: Which processor is faster in Cinebench R23 multi-core?

A: The AMD Ryzen 9 9955HX scores 37159, which is 96.5% higher than the Intel Core Ultra X9 388H's 18911.

Q: Does the Intel Core Ultra X9 388H win any benchmarks?

A: Yes, it wins 3 of the 15 head-to-head tests: PassMark find prime numbers (358 versus 287), PassMark physics (3226 versus 2720), and Cinebench R23 single-core (2200.5 versus 2174).

Q: What is the average benchmark score difference?

A: The AMD Ryzen 9 9955HX averages 91199, while the Intel Core Ultra X9 388H averages 44466. The AMD chip sits in the 96th percentile of all CPUs, the Intel chip in the 88th.

Q: Which processor has a higher boost clock?

A: The AMD Ryzen 9 9955HX boosts to 5.40 GHz, while the Intel Core Ultra X9 388H boosts to 5.10 GHz.

Q: How does the L3 cache compare?

A: The AMD Ryzen 9 9955HX has 64 MB of shared L3 cache. The Intel Core Ultra X9 388H has 18 MB of shared L3 cache.

Architecture Differences

The AMD Ryzen 9 9955HX uses the Zen 5 architecture under the Fire Range codename. It is built on a 4 nm process by TSMC. The chip contains 16,630 million transistors across a dual-die design with each die measuring 70.6 mm². The Intel Core Ultra X9 388H uses the Panther Lake architecture on a 3 nm process by Intel. It is a single-die design, though the database does not record its transistor count or die size.

The AMD part has a per-core L1 cache of 80 KB and per-core L2 of 1 MB. The Intel part has a per-core L1 of 192 KB and per-core L2 of 3 MB. The shared L3 cache differs significantly: 64 MB on AMD versus 18 MB on Intel. The AMD chip supports ECC memory, while the Intel chip does not. The AMD multiplier is unlocked, allowing overclocking, while the Intel multiplier is locked.

The integrated graphics also differ. AMD uses the Radeon 610M, while Intel uses the Arc B390. The database records no benchmark scores for either iGPU, so a direct comparison is not possible from this data.

Specification Differences

The AMD Ryzen 9 9955HX and Intel Core Ultra X9 388H differ on several key specification fields. The AMD part has a base clock of 2.50 GHz and a boost clock of 5.40 GHz. The Intel part has a base clock of 2.10 GHz and a boost clock of 5.10 GHz. Both have 16 cores, but the AMD part has 32 threads versus 16 on Intel.

The AMD chip has a TDP of 55 watts, while the Intel chip has a TDP of 25 watts. The AMD part uses AMD Socket FL1, while the Intel part uses Intel BGA 2540. Memory support differs: AMD uses DDR5 with dual-channel configuration and 89.6 GB/s bandwidth. Intel uses LPDDR5X with dual-channel configuration and 153.6 GB/s bandwidth.

PCIe connectivity differs substantially. The AMD part offers Gen 5 with 28 CPU lanes, while the Intel part offers Gen 5 with only 4 CPU lanes. The AMD chip supports ECC memory, the Intel chip does not. The release dates differ: the AMD part was released on 2025-01-05, the Intel part on 2026-01-04. Both are listed as active in production. Neither has a recorded launch MSRP in the database.