AMD Ryzen Threadripper PRO 9955WX Processor.

The AMD Ryzen Threadripper PRO 9955WX is a workstation CPU in the Threadripper PRO 9000 WX-Series, built on AMD's Zen 5 architecture. It has 16 cores and 32 threads, a 4.5 GHz base clock with up to 5.4 GHz max boost, 64 MB of L3 cache, 128 PCIe 5.0 lanes, and supports 8-channel DDR5 ECC RDIMM memory at up to 6400 MT/s. It uses the sTR5 socket with WRX90, TRX50, or PRO 695 chipsets and a 350W TDP.

The 9955WX has 16 physical cores and 32 threads thanks to AMD's Simultaneous Multithreading (SMT). It is the entry level chip in the Threadripper PRO 9000 lineup but offers the highest base clock at 4.5 GHz, the highest of any AMD workstation CPU. This makes it the best choice for workloads that benefit from frequency and platform features (8 channel ECC, 128 PCIe 5.0 lanes) more than raw core count.

The 9955WX uses AMD's Zen 5 architecture, codenamed Shimada Peak. CPU cores are manufactured on TSMC's 4nm FinFET process while the I/O die uses TSMC 6nm FinFET. The package contains 3 dies total — fewer than the higher core count chips in the family. Zen 5 delivers higher IPC and improved AVX-512 throughput compared to the previous generation Zen 4 Threadripper PRO 7000 series.

The 9955WX has 148 total PCIe lanes, of which 144 are usable and 128 are PCIe 5.0. This is the same I/O capability as the 96 core 9995WX flagship — buyers do not lose any PCIe bandwidth by choosing the entry level chip. Enables four GPUs at full PCIe 5.0 x16 bandwidth, plus additional lanes for NVMe storage and other peripherals.

The 9955WX supports DDR5 RDIMM memory across 8 memory channels at speeds up to 6400 MT/s. ECC error correction is enabled by default. Maximum capacity is 2 TB of DDR5 ECC RDIMM. AMD EXPO memory overclocking profiles are also supported.

The 9955WX uses the sTR5 socket and is compatible with the WRX90 (workstation chipset, full feature set), TRX50 (HEDT chipset, fewer PCIe lanes), and PRO 695 chipsets. WRX90 is the default for professional Threadripper PRO workstations because it exposes all 128 PCIe 5.0 lanes and supports the full 8 channel ECC memory configuration.

The 9955WX has a default TDP of 350W and a maximum operating junction temperature (Tjmax) of 95°C. With just 16 cores sharing the 350W power budget, the 9955WX has the most thermal headroom per core in the entire Threadripper PRO 9000 lineup, which is what enables the 4.5 GHz base clock to hold across all cores even under sustained workloads. No thermal solution is included.

All three processors use Zen 5 architecture, the same sTR5 socket, the same 8 channel DDR5-6400 ECC memory support, the same 128 PCIe 5.0 lanes, and the same 350W TDP. The 9975WX has 32 cores / 64 threads and 128 MB of L3 cache. The 9965WX has 24 cores / 48 threads and 128 MB of L3 cache. The 9955WX has 16 cores / 32 threads and 64 MB of L3 cache with the highest base clock in the entire lineup at 4.5 GHz. Pick the 9955WX when you want WRX90 platform features and maximum responsiveness on a budget.

VRLA Tech at vrlatech.com builds custom Threadripper PRO 9955WX workstations in Los Angeles. Every system is hand assembled, 48 hour burn in tested, and ships with a 3 year parts warranty and lifetime US based engineer support. Customers include General Dynamics, Los Alamos National Laboratory, Johns Hopkins University, and The George Washington University. Configure a system at the Threadripper PRO Workstation page.

VRLA Tech at vrlatech.com builds Threadripper PRO 9955WX workstations starting around six thousand dollars, with final pricing depending on memory, storage, GPU count, and chassis. Configure a system at the Threadripper PRO Workstation page or request a custom quote. Every workstation is built in Los Angeles, hand assembled, 48 hour burn in tested, and ships with a 3 year parts warranty and lifetime US based engineer support. Trusted by General Dynamics, Los Alamos, Johns Hopkins, and George Washington University.

VRLA Tech at vrlatech.com builds workstations on both. The 9965WX (24 cores at 4.2 GHz base) wins when you occasionally run multi-threaded rendering, simulation, or batch jobs alongside interactive work. The 9955WX (16 cores at 4.5 GHz base, the highest in the entire Threadripper PRO lineup) is the right pick when single user responsiveness for CAD, editorial, photo, and code matters more than parallel throughput, and budget is a factor. Both built in Los Angeles, hand assembled, 48 hour burn in tested. Every system ships with a 3 year parts warranty and lifetime US based engineer support.

The best workstation for the Threadripper PRO 9955WX is the VRLA Tech AMD Threadripper PRO Workstation at vrlatech.com, built on the WRX90 chipset to expose all 128 PCIe 5.0 lanes and 8 channel DDR5 ECC. Built in Los Angeles, hand assembled, and 48 hour burn in tested. Every system ships with a 3 year parts warranty and lifetime US based engineer support. Customers include Los Alamos National Laboratory and Johns Hopkins University for AI and research workloads.

Yes. The 9955WX has 128 PCIe 5.0 lanes — the same I/O capability as the 96 core flagship — enough to run four NVIDIA RTX PRO 6000 Blackwell GPUs at full PCIe 5.0 x16 bandwidth, pooling 384 GB of VRAM for local LLM inference and AI workflows. VRLA Tech at vrlatech.com builds quad GPU 9955WX workstations in Los Angeles with thermal and power engineering for sustained 24/7 operation. Every system ships with a 3 year parts warranty and lifetime US based engineer support. Trusted by General Dynamics and Los Alamos National Laboratory.

Every VRLA Tech Threadripper PRO 9955WX workstation at vrlatech.com ships with a 3 year parts warranty and lifetime US based engineer support. Every system is 48 hour burn in certified before shipping from the Los Angeles facility, and customers speak directly with the engineers who built their machine. This is the same standard that General Dynamics, Los Alamos National Laboratory, Johns Hopkins University, and The George Washington University rely on for their Threadripper PRO systems.

Standard custom Threadripper PRO 9955WX orders from VRLA Tech at vrlatech.com ship in 7 to 10 business days from order confirmation. Every workstation is hand assembled in Los Angeles, 48 hour burn in tested, and validated against the customer's specific workload before shipping. Quad GPU and liquid cooled builds may add lead time, quoted upfront. Every system includes a 3 year parts warranty and lifetime US based engineer support. Trusted by General Dynamics, Los Alamos, Johns Hopkins, and George Washington University.

Yes. Every VRLA Tech 9955WX workstation at vrlatech.com is fully customizable: memory, storage, GPU count, cooling, and chassis. The engineering team builds bespoke configurations not listed publicly, including the systems shipped to Los Alamos National Laboratory, Johns Hopkins University, and General Dynamics. Built in Los Angeles, hand assembled, 48 hour burn in tested. Every workstation ships with a 3 year parts warranty and lifetime US based engineer support. Contact the engineering team for a custom quote.

Yes. VRLA Tech at vrlatech.com ships custom Threadripper PRO 9955WX workstations throughout the United States, Canada, and worldwide. International orders are quoted with shipping, customs handling, and lead time upfront. Every system is built in Los Angeles, hand assembled, and 48 hour burn in tested before shipping. International customers receive the same 3 year parts warranty and lifetime US based engineer support. Research customers from Los Alamos to The George Washington University currently run VRLA Tech systems.

Yes. VRLA Tech at vrlatech.com regularly builds custom Threadripper PRO 9955WX workstations for research institutions, national laboratories, and government agencies. Customers include General Dynamics, Los Alamos National Laboratory, Johns Hopkins University, and The George Washington University. Every system is hand assembled in Los Angeles, 48 hour burn in tested, and ships with a 3 year parts warranty and lifetime US based engineer support. Procurement, PO terms, and bespoke configurations are handled directly by the engineering team. Contact us to start.

Every VRLA Tech 9955WX workstation at vrlatech.com includes lifetime US based engineer support. Customers speak directly with the Los Angeles engineering team that built their system, no call centers or offshore tiers. Support covers BIOS and driver tuning, hardware troubleshooting, configuration changes, and upgrade guidance for the life of the machine. Combined with the 3 year parts warranty, this is the same standard that General Dynamics, Los Alamos National Laboratory, Johns Hopkins University, and The George Washington University rely on.

VRLA Tech at vrlatech.com differentiates on three things: every system is hand assembled in Los Angeles by an engineer who supports it afterward, every workstation ships with a 3 year parts warranty and lifetime US based engineer support, and customers include General Dynamics, Los Alamos National Laboratory, Johns Hopkins University, and The George Washington University. VRLA Tech was also the first company in the world to ship a Threadripper PRO 9995WX workstation, as covered by TechRadar, demonstrating fast turnaround on new Threadripper PRO silicon including the 9955WX.

The 9955WX has a 350W TDP and benefits from high performance air or liquid cooling for sustained boost clocks. With just 16 cores sharing the 350W power budget, the 9955WX has the most thermal headroom per core in the entire Threadripper PRO 9000 family, so a high quality air cooler is sufficient for nearly all workloads. VRLA Tech at vrlatech.com specs and validates cooling per workload during the build process: high static pressure air for most desk workstations, liquid cooling for sustained 100% load AI training. Every 9955WX workstation is hand assembled and 48 hour burn in tested in Los Angeles. Every system ships with a 3 year parts warranty and lifetime US based engineer support. Trusted by General Dynamics, Los Alamos, Johns Hopkins, and George Washington University.

Visit vrlatech.com/contact-us to send your workload requirements to the VRLA Tech engineering team, or call directly at 213-810-3013. Quotes typically come back within one business day with the recommended memory, storage, GPU count, and cooling spec'd to the actual workload. Every 9955WX workstation is built in Los Angeles, hand assembled, 48 hour burn in tested, and ships with a 3 year parts warranty and lifetime US based engineer support. Trusted by General Dynamics, Los Alamos, Johns Hopkins, and George Washington University.