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

Head-to-Head Benchmarks

The recorded data shows a clean sweep for the AMD Ryzen Threadripper PRO 9955WX, with 15 wins and zero for the AMD Ryzen 9 9955HX across every compared workload. The margins, however, vary dramatically. The most extreme gap appears in Cinebench R23 single-core, where the Threadripper PRO scores 8,399 against the Ryzen 9's 2,174, a delta of 286.3%. Similarly, Cinebench R15 single-core shows 846 versus 336, a 151.8% advantage. These single-core results are striking because both CPUs share the same 5.40 GHz boost clock; the database indicates the Threadripper part delivers far higher per-thread throughput in these specific tests.

Multi-core performance tells a more nuanced story. In Cinebench R23 multi-core, the Threadripper PRO's 59,494 dwarfs the Ryzen 9's 37,159, a 60.1% lead. Cinebench R15 multi-core is much closer: 5,996 versus 5,905, a mere 1.5% edge. That narrow margin suggests that in shorter multi-threaded bursts, the mobile chip can nearly keep pace, but sustained all-core workloads expose the gap. The PassMark physics test reinforces this, with the Threadripper PRO scoring 4,156 against 2,720, a 52.8% advantage.

Looking at the PassMark suite, the Threadripper PRO leads in every category. Data compression: 920,954 versus 731,998, up 25.8%. Data encryption: 44,389 versus 37,330, up 18.9%. Extended instructions: 76,363 versus 57,946, up 31.8%. Floating-point math: 156,215 versus 136,682, up 14.3%. Integer math: 236,120 versus 212,598, up 11.1%. Random string sorting: 99,813 versus 77,890, up 28.1%. The smallest single-threaded gap appears in PassMark single-thread, where the Threadripper PRO's 4,530 beats 4,393 by only 3.1%. This indicates that for purely single-threaded integer workloads, the two are nearly interchangeable, despite the large Cinebench R23 single-core discrepancy.

The average benchmark score for the Threadripper PRO sits at 101,041, placing it in the 97th percentile of all CPUs. The Ryzen 9 9955HX averages 91,199, at the 96th percentile. The delta between their average scores is about 10.8% in favor of the desktop part. The nearest rivals in the database further contextualize these numbers. The Threadripper PRO's closest competitor, the AMD EPYC 7513, averages 102,244, which is 1.2% higher, while the EPYC 8324P scores 103,329, 2.2% above. The Ryzen 9 9955HX sits close to the Intel Xeon 654 (90,717, 0.5% lower) and the AMD Ryzen AI Max+ 392 (90,541, 0.7% lower), while the Intel Core Ultra 7 270K Plus and Intel Xeon 6520P both average 93,785, which is 2.8% higher.

FAQ

Q: Which CPU has the higher base clock speed?

A: The AMD Ryzen Threadripper PRO 9955WX has a base clock of 4.50 GHz, while the AMD Ryzen 9 9955HX has a base clock of 2.50 GHz. Both share a 5.40 GHz boost clock.

Q: How do the two chips compare in multi-threaded Cinebench R23?

A: The Threadripper PRO scores 59,494, which is 60.1% higher than the Ryzen 9's 37,159. The delta is substantial, indicating a clear advantage for sustained multi-core rendering.

Q: Is there any benchmark where the Ryzen 9 9955HX wins?

A: No. Across all 15 head-to-head tests, the Threadripper PRO 9955WX wins every one. The closest result is Cinebench R15 multi-core, where the Threadripper PRO leads by only 1.5%.

Q: What is the memory bandwidth difference?

A: The Threadripper PRO supports eight-channel memory with a bandwidth of 409.6 GB/s. The Ryzen 9 9955HX uses dual-channel memory with 89.6 GB/s, a difference of roughly 4.6 times in theoretical peak bandwidth.

Q: Do both processors have the same transistor count?

A: Yes, both list 16,630 million transistors and use a 4 nm TSMC process node with two 70.6 mm² dies. The architecture is Zen 5 for both, though the codenames differ: Shimada Peak for the Threadripper PRO and Fire Range for the Ryzen 9.

Q: How do they rank against all CPUs in the database?

A: The Threadripper PRO 9955WX sits in the 97th percentile, while the Ryzen 9 9955HX sits in the 96th. Their average benchmark scores are 101,041 and 91,199, respectively.

Architecture Differences

The two processors share a common foundation: both are Zen 5 architecture, manufactured by TSMC on a 4 nm process, with 16,630 million transistors and a die size of 2x 70.6 mm². The Threadripper PRO carries the codename Shimada Peak, while the Ryzen 9 uses Fire Range. Both have 16 cores and 32 threads, and both feature an unlocked multiplier.

The differences begin with the cache layout. The Threadripper PRO lists L1 cache as 64 KB per core, while the Ryzen 9 lists 80 KB per core. L2 cache is identical at 1 MB per core. L3 cache is 64 MB for the Threadripper PRO, and 64 MB shared for the Ryzen 9. Neither has 3D V-Cache.

Memory architecture diverges sharply. The Threadripper PRO uses an eight-channel memory bus with a peak bandwidth of 409.6 GB/s. The Ryzen 9 uses a dual-channel bus with 89.6 GB/s. Both support DDR5 and ECC memory. The PCIe configuration also differs: the Threadripper PRO provides Gen 5 with 128 lanes (CPU only), while the Ryzen 9 provides Gen 5 with 28 lanes (CPU only). This difference in lane count has direct implications for expansion and multi-GPU configurations.

The Threadripper PRO has no integrated graphics, while the Ryzen 9 includes a Radeon 610M iGPU. The socket types are entirely distinct: the Threadripper PRO uses AMD Socket sTR5, and the Ryzen 9 uses AMD Socket FL1. The form factors reflect this, with the Threadripper PRO classified as a desktop part and the Ryzen 9 as a mobile part. The TDP values underline the design intent: 350 watts for the Threadripper PRO versus 55 watts for the Ryzen 9.

The generation labels in the database differ slightly. The Threadripper PRO is listed under "Ryzen Threadripper (Zen 4 (Storm Peak))" while the Ryzen 9 is under "Ryzen 9 (Zen 5 (Fire Range))". Despite both being Zen 5, the codename and generation tags indicate different product lineages.

The Verdict

The data is unambiguous for anyone building a workstation around maximum throughput. The AMD Ryzen Threadripper PRO 9955WX wins every benchmark in the head-to-head comparison. Its 60.1% lead in Cinebench R23 multi-core and 52.8% lead in PassMark physics point to a processor designed for sustained, heavy parallel workloads. The eight-channel memory bus, with 409.6 GB/s of bandwidth versus 89.6 GB/s, further cements its position for memory-intensive tasks. For content rendering, scientific simulation, or any workload that scales with cores and memory bandwidth, the Threadripper PRO is the clear choice.

The AMD Ryzen 9 9955HX, despite losing every test, should not be dismissed. Its 55-watt TDP and mobile socket make it suitable for laptops and compact systems where power and space are constrained. In Cinebench R15 multi-core, it trails by only 1.5%, showing that short bursts of multi-threaded work are nearly competitive. The PassMark single-thread margin of 3.1% indicates that everyday single-thread responsiveness will feel similar. The integrated Radeon 610M also means the Ryzen 9 can power a display without a discrete GPU, which the Threadripper PRO cannot do.

The verdict depends on the physical and thermal envelope. If the system can accommodate a 350-watt desktop processor on socket sTR5, the Threadripper PRO offers superior performance in every measured metric. If the requirement is a mobile platform with a 55-watt processor, the Ryzen 9 9955HX is the only option of the two, and its performance is respectable given the constraints. The database shows no scenario where the Ryzen 9 wins a benchmark, but its existence as a high-core-count mobile part is valuable in its own right.

Specification Differences

The following fields differ between the AMD Ryzen Threadripper PRO 9955WX and the AMD Ryzen 9 9955HX:

• Base Clock: 4.50 GHz versus 2.50 GHz
• TDP: 350 watts versus 55 watts
• Socket: AMD Socket sTR5 versus AMD Socket FL1
• Codename: Shimada Peak versus Fire Range
• Generation: Ryzen Threadripper (Zen 4 (Storm Peak)) versus Ryzen 9 (Zen 5 (Fire Range))
• L1 Cache: 64 KB (per core) versus 80 KB (per core)
• L3 Cache: 64 MB versus 64 MB (shared)
• Memory Bus: Eight-channel versus Dual-channel
• Memory Bandwidth: 409.6 GB/s versus 89.6 GB/s
• PCIe: Gen 5, 128 Lanes (CPU only) versus Gen 5, 28 Lanes (CPU only)
• Integrated Graphics: N/A versus Radeon 610M
• Market Segment: Desktop versus Mobile
• Release Date: 2025-07-22 versus 2025-01-05
• Part Number: 100-000000725 versus 100-000001028

Fields that are identical include: cores (16), threads (32), boost clock (5.40 GHz), architecture (Zen 5), process node (4 nm), foundry (TSMC), transistors (16,630 million), die size (2x 70.6 mm²), L2 cache (1 MB per core), memory support (DDR5), ECC memory (true), multiplier unlocked (true), and production status (Active).

Where Each One Wins

The AMD Ryzen Threadripper PRO 9955WX wins in every head-to-head benchmark, so the split is not about test categories but about workload context. The largest margins appear in single-core Cinebench tests (151.8% and 286.3% deltas), which suggests the desktop part has a significant advantage in lightly-threaded rendering or simulation tasks that use Cinebench's engine. The PassMark extended instructions test (31.8% ahead) and data compression (25.8% ahead) indicate that the Threadripper PRO is well-suited for encryption, compression, and code compilation workloads. The 52.8% lead in physics simulation points to strong integer and floating-point throughput for scientific computing. With 128 PCIe Gen 5 lanes, it can also drive extensive GPU and storage arrays, making it a fit for multi-GPU workstations or server-like desktop builds.

The AMD Ryzen 9 9955HX, while losing all tests, shows relative strengths in specific areas. Its narrow 1.5% deficit in Cinebench R15 multi-core means that for short, bursty multi-threaded tasks, the mobile chip is nearly as fast. The 3.1% gap in PassMark single-thread indicates that everyday productivity, web browsing, and office applications will feel comparable. The Radeon 610M integrated graphics allow for a fully functional system without a discrete GPU, which is a capability the Threadripper PRO lacks entirely. The 55-watt TDP makes it suitable for thin-and-light or performance laptops, where the Threadripper PRO's 350-watt requirement is physically impossible. The dual-channel memory bus, while much narrower, is sufficient for many mobile workloads and contributes to lower power consumption.

In practical terms, the Threadripper PRO 9955WX is for fixed, high-power workstations where every millisecond of compute time matters and where memory bandwidth and PCIe expansion are critical. The Ryzen 9 9955HX is for mobile workstations that need 16 cores and 32 threads in a power-constrained chassis, accepting lower absolute performance in exchange for portability. The launch MSRP for the Threadripper PRO is $1649, which the database records without further pricing commentary.