AMD Ryzen AI 9 HX 375 vs AMD Ryzen Threadripper PRO 9955WX Comparison

Head-to-Head Benchmarks

The benchmark data presents a complete sweep. The AMD Ryzen Threadripper PRO 9955WX wins all fifteen recorded comparisons against the AMD Ryzen AI 9 HX 375. The margins are substantial in nearly every category, with the narrowest gap appearing in single-threaded workloads.

The most decisive result appears in Cinebench R23 single-core, where the Threadripper PRO 9955WX scores 8399 against 1988 for the Ryzen AI 9 HX 375, a 76.3% advantage. This is the largest percentage delta in the entire comparison. The multi-core Cinebench R23 result shows a similar pattern: 59494 versus 21812, a 63.3% gap. Cinebench R15 multi-core shows 5996 versus 3334 (44.4% ahead), and Cinebench R15 single-core shows 846 versus 301 (64.4% ahead).

The PassMark suite reinforces the multi-threaded dominance. In integer math, the Threadripper PRO 9955WX scores 236120 against 121754, a 48.4% lead. Floating point math shows 156215 versus 75153, a 51.9% margin. The multithread score lands at 67035 versus 32916, a 50.9% gap. Data compression results in 920954 versus 404918, a 56% difference. Data encryption shows 44389 versus 20802, a 53.1% margin.

The single-thread PassMark result narrows the gap considerably. The Threadripper PRO 9955WX scores 4530, while the Ryzen AI 9 HX 375 scores 3867. That is a 14.6% advantage, the smallest delta in the dataset. This indicates that while the desktop processor leads in every test, its advantage shrinks when the workload does not scale across many cores.

Other PassMark workloads follow the expected pattern. Extended instructions show 76363 versus 29269, a 61.7% margin. Find prime numbers delivers 337 versus 122, a 63.8% gap. Physics simulation scores 4156 versus 1819, a 56.2% difference. Random string sorting produces 99813 versus 44552, a 55.4% lead.

The averaged benchmark score tells a similar story. The Threadripper PRO 9955WX holds an average of 101041, placing it at the 97th percentile among all CPUs in the database. The Ryzen AI 9 HX 375 averages 46030, sitting at the 89th percentile. The nearest rival comparison confirms the positioning: the Threadripper PRO 9955WX trades within 1.2% of the AMD EPYC 7513, while the Ryzen AI 9 HX 375 sits within 0.1% of the Intel Core Ultra 5 235 and 0.2% of the AMD EPYC 7303.

The Verdict

The data points to two entirely different classes of processor. The Ryzen Threadripper PRO 9955WX is a desktop workstation part aimed at sustained heavy computation. The Ryzen AI 9 HX 375 is a mobile processor designed for a 28 W thermal envelope. The benchmark results reflect that division clearly.

For workloads that use multiple cores, the Threadripper PRO 9955WX is the clear choice. It leads by 63.3% in Cinebench R23 multi-core and by 50.9% in PassMark multithread. The margins in integer math, floating point math, data compression, and encryption all exceed 48%. Anyone running rendering, simulation, or data processing tasks should look at the desktop part.

For single-threaded responsiveness, the gap narrows. The PassMark single-thread result shows only a 14.6% difference. The Ryzen AI 9 HX 375 remains competitive in lightly threaded tasks, though it still trails. The Cinebench R23 single-core result shows a much larger gap at 76.3%, so the desktop processor also holds a clear lead in that metric.

The market segments confirm the intended use. The Ryzen AI 9 HX 375 is listed as a mobile part with integrated Radeon 890M graphics. The Threadripper PRO 9955WX is a desktop part with no integrated graphics. The mobile processor supports DDR5 and LPDDR5X memory on a dual-channel bus with 89.6 GB/s bandwidth. The desktop processor supports DDR5 on an eight-channel bus with 409.6 GB/s bandwidth. The memory bandwidth difference alone explains much of the multi-core gap.

Where Each One Wins

The Ryzen AI 9 HX 375 wins no benchmark categories in this dataset. Every recorded test favors the Threadripper PRO 9955WX. However, the mobile part does have attributes that matter outside raw performance.

The 28 W TDP makes it suitable for thin laptops. The integrated Radeon 890M graphics remove the need for a discrete GPU in basic display tasks. The FP8 socket and dual-channel memory support fit compact motherboards. The 233 mm² die size and 4 nm TSMC process node indicate a design optimized for efficiency in a mobile chassis.

The Threadripper PRO 9955WX wins every compute benchmark, and it does so by wide margins in multi-threaded workloads. Its 16 cores and 32 threads, combined with 64 MB of L3 cache, drive the multi-core results. The eight-channel memory bus at 409.6 GB/s provides the bandwidth for data-intensive tasks. The 350 W TDP reflects a part designed for sustained full-load operation in a desktop workstation.

The use-case split is straightforward. The Ryzen AI 9 HX 375 fits mobile systems where portability and power efficiency take priority. The Threadripper PRO 9955WX fits fixed workstations where maximum throughput matters more than power draw. The 128 PCIe Gen 5 lanes on the desktop part support large numbers of expansion cards, storage devices, and accelerators. The 16 PCIe Gen 4 lanes on the mobile part serve a more limited set of peripherals.

ECC memory support on the Threadripper PRO 9955WX adds reliability for long-running computations where memory errors cannot be tolerated. The Ryzen AI 9 HX 375 lacks ECC support, which matters for certain professional workflows.

FAQ

Q: Which processor has a higher single-core score?

A: The Ryzen Threadripper PRO 9955WX leads in both single-core tests. Cinebench R23 single-core shows 8399 versus 1988, a 76.3% margin. PassMark single-thread shows 4530 versus 3867, a 14.6% margin.

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

A: The Threadripper PRO 9955WX leads by 63.3% in Cinebench R23 multi-core (59494 versus 21812) and by 50.9% in PassMark multithread (67035 versus 32916). The smallest multi-core margin is 44.4% in Cinebench R15 multi-core.

Q: Does the Ryzen AI 9 HX 375 support ECC memory?

A: No. The Ryzen AI 9 HX 375 does not support ECC memory. The Ryzen Threadripper PRO 9955WX does support ECC memory.

Q: What memory bandwidth does each processor support?

A: The Ryzen AI 9 HX 375 supports dual-channel memory with 89.6 GB/s bandwidth. The Ryzen Threadripper PRO 9955WX supports eight-channel memory with 409.6 GB/s bandwidth.

Q: Which processor has integrated graphics?

A: The Ryzen AI 9 HX 375 includes Radeon 890M integrated graphics. The Ryzen Threadripper PRO 9955WX has no integrated graphics.

Q: What is the launch MSRP of the Threadripper PRO 9955WX?

A: The launch MSRP is $1649. The Ryzen AI 9 HX 375 has no recorded launch MSRP in the database.

Architecture Differences

Both processors use the Zen 5 architecture on a 4 nm TSMC process node. The similarities end there. The Ryzen AI 9 HX 375 uses the Strix Point codename and belongs to the Ryzen AI 300 generation. The Threadripper PRO 9955WX uses the Shimada Peak codename and belongs to the Ryzen Threadripper 9000 series.

The mobile part combines Zen 5 and Zen 5c cores in a hybrid arrangement. The desktop part uses only Zen 5 cores. The core counts differ: 12 cores and 24 threads for the mobile part, 16 cores and 32 threads for the desktop part. The die size reflects this difference. The Ryzen AI 9 HX 375 measures 233 mm² as a single die. The Threadripper PRO 9955WX uses two dies at 70.6 mm² each, totaling 141.2 mm² of silicon. The desktop part also lists 16,630 million transistors, while the mobile part has no transistor count recorded.

Cache configurations differ substantially. The Ryzen AI 9 HX 375 has 80 KB of L1 per core, 1 MB of L2 per core, and 16 MB of shared L3. The Threadripper PRO 9955WX has 64 KB of L1 per core, 1 MB of L2 per core, and 64 MB of shared L3. The larger L3 cache on the desktop part contributes to its performance advantage in cache-sensitive workloads.

PCIe support differs by generation and lane count. The Ryzen AI 9 HX 375 provides 16 PCIe Gen 4 lanes. The Threadripper PRO 9955WX provides 128 PCIe Gen 5 lanes. The desktop part also has an unlocked multiplier, allowing overclocking. The mobile part has a locked multiplier.

The Threadripper PRO 9955WX uses AMD Socket sTR5, while the Ryzen AI 9 HX 375 uses AMD Socket FP8. The desktop part is listed as a desktop market segment, and the mobile part is listed as a mobile market segment.

Specification Differences

The two processors differ in nearly every major specification. Core count: 12 versus 16. Thread count: 24 versus 32. Base clock: 2.00 GHz versus 4.50 GHz. Boost clock: 5.10 GHz versus 5.40 GHz. TDP: 28 W versus 350 W. The desktop part runs at higher clocks across the board, which explains its single-thread advantage.

Memory support differs in channel count and bandwidth. The Ryzen AI 9 HX 375 supports DDR5 and LPDDR5X on a dual-channel bus with 89.6 GB/s. The Threadripper PRO 9955WX supports DDR5 on an eight-channel bus with 409.6 GB/s. The desktop part also supports ECC memory, while the mobile part does not.

PCIe configuration differs entirely. The mobile part offers 16 Gen 4 lanes. The desktop part offers 128 Gen 5 lanes. This makes the Threadripper PRO 9955WX suitable for systems with many GPUs, NVMe drives, and network cards.

Integrated graphics are present on the mobile part only. The Radeon 890M provides display output and basic acceleration. The desktop part has no integrated graphics, requiring a discrete GPU for any display output.

Release dates differ by about a year. The Ryzen AI 9 HX 375 was released on 2024-06-30. The Threadripper PRO 9955WX was released on 2025-07-22. Both are listed as active production parts.

The launch MSRP for the Threadripper PRO 9955WX is $1649. The Ryzen AI 9 HX 375 has no launch MSRP recorded. The desktop part has an unlocked multiplier, while the mobile part does not. The socket types differ: FP8 for mobile, sTR5 for desktop.

The cache hierarchy differs in L1 and L3 sizes. The mobile part has 80 KB of L1 per core versus 64 KB on the desktop part. The desktop part has 64 MB of L3 versus 16 MB on the mobile part. L2 remains 1 MB per core on both.