AMD Ryzen Threadripper PRO 3955WX 16-core sTRX4
With 128 PCIe 4.0 lanes and eight-channel DDR4 memory, this 16-core processor provides unmatched I/O bandwidth for multi-GPU and high-speed storage configurations. Its built-in AMD PRO security features and 4.3 GHz boost clock deliver reliable, high-frequency performance for sensitive workloads. This chip is best for workstation users running concurrent 3D rendering, simulation, and 4K encoding tasks who need maximum expandability.
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Panoramica
The 30-Second Version
The Threadripper PRO 3955WX is a 16-core workstation monster with best-in-class platform I/O and strong multi-thread performance. Efficiency is its Achilles heel at 280W TDP. Worth it if you need the lanes and cores, skip it if you care about power draw.
Pros & Cons
Pro
- 16 cores and 32 threads crush multi-threaded workloads 97th
- 128 PCIe 4.0 lanes is absurd I/O headroom 91st
- Eight-channel DDR4 memory bandwidth is workstation-grade 89th
- Top-tier platform ranking in our database 79th
Contro
- 280W TDP means serious cooling and power bills
- No cooler included in the box
- Efficiency score is rough at 30.7 out of 100
- DDR4 only, no DDR5 support
Le prove
Performance
Multi-threaded work is where this thing shines. A PassMark score of 39,788 puts it in the 90th percentile for multi-thread performance, and the 128 PCIe 4.0 lanes mean you can load up on GPUs and NVMe drives without running out of bandwidth. Single-thread is solid too, landing in the 76th percentile with a 2,681 score. The weak spot is efficiency. A 280W TDP for 16 cores is not exactly sipping power, and the efficiency score of 30.7 out of 100 tells the story. You are trading electricity for raw throughput.
Specifications
Full Specifications
Processor
| Brand | AMD |
| Series | Ryzen Threadripper PRO |
| Model | 3955WX |
| Class | hedt |
Cores & Clocks
| Cores | 16 |
| Threads | 32 |
| Base Clock | 3900 |
| Boost Clock | 4300 |
Cache
| L2 Cache | 8 |
| L3 Cache | 72 MB |
Performance
| PassMark Multi | 39788 |
| PassMark Single | 2681 |
Memory
| Memory Type | DDR4 |
| Channels | 8 |
Platform & Power
| Socket | sTRX4 |
| PCIe | 4 |
| PCIe Lanes | 128 |
| TDP | 280 |
| Unlocked | Yes |
vs Competition
Against something like the Intel Core Ultra 9 285K, the 3955WX wins on raw platform capability and PCIe lanes but loses on efficiency and single-thread snappiness. The 285K is a newer architecture with better power characteristics. The other competitors in our list are not really direct rivals, a G.Skill memory kit and a Phenom II X6 are not in the same conversation. The EPYC chip is server territory, which is a different beast entirely. For pure workstation throughput per dollar, the 3955WX holds its own, but it is aging.
| Spec | AMD Ryzen Threadripper PRO 3955WX | Intel Core Ultra 9 285K | Dell Xeon E5-2637 V2 | SMC EPYC 9555P | D&H Core i9 BX80673I99980X | Hewlett Packard Enterprise Xeon P67080-B21 |
|---|---|---|---|---|---|---|
| Cores | 16 | 24 | 32 | 64 | 18 | 16 |
| Threads | 32 | 24 | 64 | 128 | 36 | 32 |
| Boost Clock Mhz | 4300 | 5700 | 3500 | 4400 | 4400 | 3900 |
| L3 Cache Mb | 72 | 36 | 256 | 256 | 24.75 | 37.5 |
| Tdp W | 280 | 125 | 200 | 360 | 165 | 195 |
| Socket | sTRX4 | LGA 1851 | Socket A/Socket 462 (PGA 462) | AMD Socket SP5 | LGA2066 | LGA 4677 |
| Integrated Graphics | - | Intel Graphics | No | - | - | No |
| Compare | Compare | Compare | Compare | Compare |
| Prodotto | AI | Feature | Platform | Efficiency | Multi Thread | Riscontro degli utenti | Affordability | Single Thread |
|---|---|---|---|---|---|---|---|---|
| AMD Ryzen Threadripper PRO 3955WX | 90.9 | 79.3 | 97.3 | 66.3 | 88.7 | 26.1 | 15.4 | 75.3 |
| Intel Core Ultra 9 285K Compare | 96.2 | 99.9 | 95.9 | 97 | 96.2 | 90.4 | 18.5 | 99.9 |
| Dell Xeon E5-2637 V2 Compare | 99.1 | 90.9 | 76.4 | 97.4 | 99.1 | 0 | 88.4 | 88.7 |
| SMC EPYC 9555P Compare | 99.3 | 77.1 | 96.8 | 88.9 | 99.4 | 0 | 0.4 | 85.2 |
| D&H Core i9 BX80673I99980X Compare | 97.3 | 62.6 | 82.5 | 99.4 | 99.8 | 72.4 | 7.7 | 95.7 |
| Hewlett Packard Enterprise Xeon P67080-B21 Compare | 91.8 | 77.1 | 90.7 | 78.1 | 89.4 | 0 | 2.7 | 79.7 |
Prezzo
Value & Pricing
At $500 USD for a used or older listing, this chip is a weird value proposition. You get workstation-class I/O and 16 cores for less than many mainstream high-end desktop CPUs. But you also need an sTRX4 motherboard, which are not cheap, plus a beefy cooler. The total platform cost adds up fast. If you already have the board or find a bundle deal, it is a steal. If you are starting from scratch, do the math before you commit.
Approfondisci
Overview
The Threadripper PRO 3955WX is a workstation chip that refuses to slow down. 16 cores, 32 threads, and a 4.3GHz boost clock with 72MB of L3 cache means it chews through renders and simulations without breaking a sweat. The platform sits in the 97th percentile in our database, which is basically the top of the charts for this class of CPU.
But this is not a chip for everyone. It pulls 280W, needs a cooler you have to buy separately, and runs on the sTRX4 socket with eight-channel DDR4. If you are building a serious workstation, that I/O is a dream. If you just want to game, you are shopping in the wrong aisle.
Common Questions
Q: Does the Threadripper PRO 3955WX come with a cooler?
No, AMD does not include a cooler with this chip. You will need a beefy aftermarket cooler rated for at least 280W TDP.
Q: What motherboard do I need for this CPU?
You need an sTRX4 socket motherboard, which is the workstation platform for Threadripper PRO chips. These boards are not cheap and are aimed at professional builders.
Q: Can I use this for gaming?
You can, but it is overkill and not ideal. The single-thread performance is decent at 2,681 PassMark, but you are paying for cores and PCIe lanes you will not use in games.
Who Should Skip This
Skip this if you are a gamer or a casual user. The platform cost, power draw, and lack of a cooler make it a terrible fit for anything but heavy workstation tasks. If you need efficiency or modern features like DDR5, look at newer mainstream chips instead.
Verdict
Buy this if you need a high-core-count workstation on a budget and you already have or can find an sTRX4 board. It is built for 3D rendering, video encoding, and heavy simulation work. The 128 PCIe lanes alone make it worth considering for multi-GPU setups. Just know you are buying into a platform that is not getting any younger.
