AMD® Ryzen™ Threadripper PRO 9955WX

The AMD Ryzen Threadripper PRO 9955WX is a workstation processor with 16 cores and 32 threads, built on the Zen 5 architecture (4 nm process). It launched in Jul 2025. Clocks run from 4.5 GHz base to 5.4 GHz boost. A 64-MB L3 cache backs the cores (5.1 MB per core). It supports DDR5 memory. The chip drops into the sTR5 socket and exposes PCIe 5.0. Rated TDP is 350 W. Notable platform capabilities: AVX-512, AVX-VNNI, AMD-V (Hardware Virtualization), AMD SEV.

The AMD Ryzen Threadripper PRO 9955WX scores 4,551 in single-core performance and 67,105 in multi-core performance (PassMark CPU Mark ratings). From those two ratings Feex computes 17,476 for overall performance, 49,990 for productivity performance, 45,100 for creator performance, 77,171 for engineering performance and 30,429 for gaming performance. Its multi-core throughput works out to 4,194 per core, 2,097 per thread and 192 per watt. Its computed efficiency index is 934. Its performance index is 217, so its overall performance is 117% above the Intel Core i5-12400 (index 100). Each bar shows the score as a share of a reference ceiling, which is the larger of the 99th-percentile score across the Feex CPU database and a fixed baseline.

Scores for individual PassMark CPU Mark test categories. Higher is better. These are measured test scores, not computed from the single-core and multi-core ratings.

In the individual workload tests the AMD Ryzen Threadripper PRO 9955WX scores 236,120 in integer math, 156,215 in floating-point math, 920,954 in compression, 44,389 in cryptography, 4,156 in physics simulation, 76,363 in vector SIMD, 337 in the prime sieve and 99,813 in sorting. Higher is better. Compared with the Intel Core i5-12400, it is 301% above in integer math, 240% above in floating-point math, 304% above in compression, 286% above in cryptography, 281% above in physics simulation, 392% above in vector SIMD, 403% above in the prime sieve and 341% above in sorting. Each bar shows the score as a share of that workload's reference ceiling, the larger of the 99th-percentile score across CPUs with a recorded value and a fixed baseline.

The AMD Ryzen Threadripper PRO 9955WX has 16 physical cores and runs 32 logical threads. It runs 2 threads per core. It runs at a base clock of 4.50 GHz and boosts up to 5.40 GHz. Its clock multiplier is unlocked for overclocking.

The AMD Ryzen Threadripper PRO 9955WX is a workstation processor, belongs to the AMD Threadripper PRO family, uses the Zen 5 architecture, carries the codename Shimada Peak and is manufactured on a 4 nm process. It launched in Jul 2025.

The AMD Ryzen Threadripper PRO 9955WX has 1.25 MB of L1 cache, 16 MB of L2 cache and 64 MB of L3 cache. That adds up to about 81.3 MB of cache, or 5.08 MB per core. Each core has 1 MB of private L2 cache.

The AMD Ryzen Threadripper PRO 9955WX has a 3-level cache hierarchy: L1 at 1.3 MB, L2 at 16 MB and L3 at 64 MB. L3 is the largest level and makes up about 79% of the cache listed here.

The AMD Ryzen Threadripper PRO 9955WX supports DDR5 memory, uses 8 memory channels and runs memory at up to 6,400 MT/s. It does not support DDR4 and LPDDR memory.

The AMD Ryzen Threadripper PRO 9955WX does not include integrated graphics, so a discrete graphics card is required for display output.

The AMD Ryzen Threadripper PRO 9955WX uses the sTR5 socket and supports PCI Express 5.0.

The AMD Ryzen Threadripper PRO 9955WX has a rated TDP of 350 W.

Instruction sets, security, virtualization, AI acceleration and OS readiness. Features are listed as supported, explicitly not supported, or not recorded; a feature that is not recorded is not the same as unsupported.

The AMD Ryzen Threadripper PRO 9955WX is manufactured by TSMC. It launched at a price of $1,649.

The AMD Ryzen Threadripper PRO 9955WX is also identified by the model number 9955WX.

Feex has recorded 59% of the specifications it tracks for the AMD Ryzen Threadripper PRO 9955WX. Values Feex does not hold are shown as "Not recorded" rather than estimated.

Not recorded: Core Configuration: Performance Cores, Efficiency Cores, Hybrid Architecture and All-Core Boost. Architecture & Generation: ISA Family and Market Status. Cache: L4 Cache. Memory Support: Memory Bandwidth and ECC Memory. Platform & Compatibility: Package, Package Size and PCIe Lanes. Power & Thermals: Base Power, Maximum Turbo Power, Configurable TDP (Min), Configurable TDP (Max), Max Junction Temperature and Tcase. Physical & Manufacturing: Transistor Count, Die Size and Die Count. Naming & Aliases: SKU, Processor Number and Part Number.

Processors that use the same sTR5 socket as the AMD Ryzen Threadripper PRO 9955WX and have the closest multi-core scores in the Feex database include AMD Ryzen Threadripper PRO 9945WX, AMD Ryzen Threadripper PRO 7945WX, AMD Ryzen Threadripper 9960X, AMD Ryzen Threadripper PRO 9965WX and AMD Ryzen Threadripper PRO 7975WX.