AMD Ryzen 9 9955HX3D vs Intel Core Ultra X9 388H Comparison

Where Each One Wins

The recorded benchmark data splits cleanly between the two processors. The AMD Ryzen 9 9955HX3D takes 14 of the 15 head-to-head comparisons, while the Intel Core Ultra X9 388H claims exactly one victory. That single win is in Cinebench R23 single-core, where Intel scores 2200.5 against AMD's 2159.5, a margin of 1.9 percent. Every other measured test favors the AMD part, often by a very wide margin.

The AMD processor's dominance is most pronounced in heavily parallel workloads. In Cinebench R23 multi-core, it scores 38161.5 versus Intel's 18911, a 101.8 percent advantage. Cinebench R15 multi-core shows a similar pattern: 6042.5 against 2955, a 104.5 percent gap. PassMark integer math delivers the largest delta of the entire set, with AMD at 222503 and Intel at 90882, a 144.8 percent lead. Data compression follows closely at 117.2 percent (785811 versus 361763), and extended instructions sit at 109.8 percent (62813 versus 29943).

For single-threaded and lightly threaded tasks, the gap narrows considerably. PassMark single-thread shows AMD at 4511 and Intel at 4280, only 5.4 percent apart. Cinebench R15 single-core gives AMD 332 versus Intel's 309.5, a 7.3 percent edge. The one Intel win, Cinebench R23 single-core, suggests that in certain specific single-thread scenarios, the Intel architecture can edge ahead despite losing most other tests by large margins.

The use-case split is therefore straightforward. The AMD Ryzen 9 9955HX3D is the choice for rendering, compilation, simulation, encryption, and any workload that scales across many threads. The Intel Core Ultra X9 388H is competitive only in narrow single-threaded windows, and even there it wins just one of three single-core tests. The data shows no scenario where Intel wins in multi-threaded performance, memory-heavy operations, or math-intensive tasks.

Architecture Differences

The two processors diverge at the architectural level more than their core counts suggest. Both have 16 cores, but the AMD Ryzen 9 9955HX3D supports 32 threads, while the Intel Core Ultra X9 388H supports only 16. That thread disparity is the single largest structural difference and explains much of the multi-core performance gap. AMD uses simultaneous multithreading, Intel does not.

AMD builds on the Zen 5 architecture with the Fire Range codename, fabricated on a 4 nm TSMC process. The die consists of two 70.6 mm² chiplets with a combined 16,630 million transistors. Intel uses the Panther Lake architecture, fabricated on Intel's own 3 nm node, with no transistor or die size figures recorded in the database. Process technology favors Intel by node size, but AMD's larger transistor budget and chiplet design deliver far higher measured throughput.

Cache configurations differ substantially. AMD provides 80 KB of L1 per core, 1 MB of L2 per core, and 128 MB of L3 cache. Intel provides 192 KB of L1 per core, 3 MB of L2 per core, but only 18 MB of shared L3. The AMD part has over seven times the L3 capacity, which directly benefits workloads with large working sets, such as data compression and extended instruction tests. Intel's larger per-core L2 may help with some localized access patterns, but the benchmark results do not show it overcoming AMD's L3 advantage.

Memory support also diverges. AMD uses DDR5 with dual-channel access and a recorded bandwidth of 89.6 GB/s, plus ECC support. Intel uses LPDDR5X with dual-channel access and a higher recorded bandwidth of 153.6 GB/s, but no ECC. Despite Intel's 71.4 percent bandwidth advantage on paper, AMD wins the data compression test by 117.2 percent, indicating that raw memory bandwidth is not the limiting factor in these workloads.

PCIe lane counts differ sharply. AMD provides Gen 5 with 28 lanes from the CPU, while Intel provides Gen 5 with only 4 lanes. That makes AMD far more suitable for systems with multiple high-speed devices such as GPUs and NVMe storage. Integrated graphics also differ: AMD uses Radeon 610M, Intel uses Arc B390. Intel's integrated graphics is likely more capable, but the database does not include GPU benchmarks for either part.

Power and thermal characteristics show a notable inversion. AMD has a TDP of 55 watts, while Intel has a TDP of 25 watts. Intel draws less power, but the performance per watt is not favorable given that it loses most tests by triple-digit percentages. AMD also has an unlocked multiplier, Intel does not, meaning AMD can be overclocked while Intel is locked.

The Verdict

The recorded data points to a clear hierarchy. The AMD Ryzen 9 9955HX3D sits in the 96th percentile of all CPUs in the database, while the Intel Core Ultra X9 388H sits in the 88th percentile. The average benchmark score for AMD is 97453, against Intel's 44466, a 119.2 percent difference. AMD's nearest rivals include the AMD Ryzen Threadripper PRO 5965WX at 98504 (1.1 percent higher), the AMD Ryzen 9 PRO 9945 at 96083 (1.4 percent lower), and the AMD EPYC 4565P at 95764 (1.8 percent lower). Intel's nearest rivals are far closer in absolute terms: the AMD Ryzen 5 7500X3D at 44573 (0.2 percent higher), the Intel Core i9-13950HX at 44342 (0.3 percent lower), and the AMD Ryzen AI Max 385 at 44309 (0.4 percent lower).

For multi-threaded performance, the AMD Ryzen 9 9955HX3D is the definitive winner. It doubles or nearly doubles Intel's scores in Cinebench R23 multi-core, Cinebench R15 multi-core, integer math, and data compression. The 32 threads versus 16 threads is the obvious driver, but the 128 MB L3 cache also contributes in cache-sensitive workloads. Anyone running render farms, scientific simulations, or heavy data processing should select the AMD part based on these measurements.

For single-thread performance, the picture is mixed. Intel wins Cinebench R23 single-core by 1.9 percent, but loses Cinebench R15 single-core by 7.3 percent and PassMark single-thread by 5.4 percent. The Intel part is not consistently faster in single-threaded work; it wins only one narrow test. The data does not support choosing Intel for general single-threaded tasks, only for the specific Cinebench R23 workload.

The only scenario where Intel looks rational is when power consumption is the primary constraint. With a 25 watt TDP versus AMD's 55 watts, Intel uses less energy under load. For a mobile device where battery life or thermal limits are critical, that difference matters. But the performance cost is severe: Intel loses 70.3 percent in PassMark multithread and 101.8 percent in Cinebench R23 multi-core. The database shows no workload where Intel's lower power budget translates into a performance win.

FAQ

Q: Which processor has more threads?

A: The AMD Ryzen 9 9955HX3D has 32 threads, while the Intel Core Ultra X9 388H has 16 threads. Both have 16 cores.

Q: Does Intel win any benchmark at all?

A: Yes, Intel wins Cinebench R23 single-core with a score of 2200.5 versus AMD's 2159.5, a 1.9 percent margin. This is the only Intel win across 15 head-to-head tests.

Q: How large is the multi-core performance gap?

A: In Cinebench R23 multi-core, AMD scores 38161.5 and Intel scores 18911, giving AMD a 101.8 percent advantage. In Cinebench R15 multi-core, AMD leads 6042.5 to 2955, a 104.5 percent gap.

Q: What is the cache difference between the two?

A: AMD has 128 MB of L3 cache, while Intel has 18 MB of shared L3. AMD also has 80 KB of L1 per core and 1 MB of L2 per core; Intel has 192 KB of L1 per core and 3 MB of L2 per core.

Q: How do the average benchmark scores compare?

A: AMD's average benchmark score is 97453, placing it in the 96th percentile of all CPUs. Intel's average is 44466, placing it in the 88th percentile. That is a 119.2 percent difference in AMD's favor.

Q: Which processor has a higher boost clock?

A: AMD has a boost clock of 5.40 GHz, while Intel has a boost clock of 5.10 GHz. AMD also has a higher base clock at 2.50 GHz versus Intel's 2.10 GHz.

Head-to-Head Benchmarks

The largest win for AMD comes in PassMark integer math, where it scores 222503 against Intel's 90882, a 144.8 percent delta. This test measures raw integer arithmetic throughput, which benefits directly from AMD's 32 threads. The second-largest win is in data compression, 785811 versus 361763, a 117.2 percent gap. The 128 MB L3 cache likely helps here, as compression algorithms frequently revisit data blocks. Extended instructions follow at 109.8 percent, with AMD at 62813 and Intel at 29943.

Cinebench R15 multi-core gives AMD a 104.5 percent win (6042.5 versus 2955), and Cinebench R23 multi-core gives a 101.8 percent win (38161.5 versus 18911). These are the canonical rendering workloads, and the results confirm that AMD's thread count advantage translates directly into rendering performance. PassMark multithread shows a 70.3 percent win (62674 versus 36811), and random string sorting shows an 89.7 percent win (83497 versus 44010). The latter is notable because sorting is typically memory-latency sensitive, yet AMD still dominates.

Find prime numbers gives AMD a 46.6 percent win (525 versus 358), a smaller but still decisive margin. Physics simulation shows a 45.3 percent win (4687 versus 3226). Data encryption gives AMD a 38.5 percent win (39446 versus 28490), and floating-point math gives a 28.1 percent win (144122 versus 112550). These results show that even in workloads where the gap is smaller, AMD remains ahead by double digits.

The only Intel win is Cinebench R23 single-core, 2200.5 versus 2159.5, a 1.9 percent margin. This is a narrow result and does not indicate a general single-thread advantage. In Cinebench R15 single-core, AMD wins 332 versus 309.5, a 7.3 percent gap. In PassMark single-thread, AMD wins 4511 versus 4280, a 5.4 percent gap. Intel's single-core performance is competitive but not superior across the board.

The data compression test deserves special attention. Intel has a higher memory bandwidth rating at 153.6 GB/s versus AMD's 89.6 GB/s, yet AMD wins by 117.2 percent. This indicates that memory bandwidth alone does not determine compression performance. Thread count and cache size play larger roles. The same logic applies to extended instructions, where AMD's 109.8 percent win suggests that SIMD and instruction-level parallelism are better served by AMD's architecture in this configuration.

Overall, the head-to-head results are lopsided but not uniform. AMD's wins range from 5.4 percent to 144.8 percent, with most above 40 percent. Intel's single win is below 2 percent. The database shows a processor that is faster in nearly every measurable category, with the sole exception being a single Cinebench R23 run. For anyone comparing these two parts, the AMD Ryzen 9 9955HX3D is the performance leader in the recorded data.