AMD Ryzen Threadripper PRO 3955WX
AMD Ryzen Threadripper PRO 3955WX: An In-Depth Review of the Processor for Professionals
Current as of April 2025
Introduction
The Ryzen Threadripper PRO processors have long been recognized as top-tier solutions for workstations. The 3955WX, released in 2021, remains in demand in 2025 due to its balance of performance, reliability, and unique features. In this article, we will discuss who this CPU is suitable for, how to use it correctly, and what to pay attention to when assembling a system.
1. Key Specifications
Architecture and Process Technology
- Codename: Castle Peak (Zen 3).
- Process: TSMC 7nm FinFET.
- Cores/Threads: 16/32.
- Cache: 64 MB L3 + 8 MB L2.
- TDP: 280 W.
The processor is built on the Zen 3 architecture, which provides high IPC (instructions per clock). Although Zen 5 is already available on the market, Zen 3 remains relevant for professional tasks due to its stability and optimization for multi-threaded workloads.
Performance
- Geekbench 6:
- Single-core: 1677.
- Multi-core: 12534.
These results show that the 3955WX excels in rendering, code compilation, and virtualization. For example, in Blender (demo scene "Classroom"), the processor completes rendering in 2.1 minutes — a result comparable to modern 24-core CPUs.
Key Features
- ECC Memory Support: Critical for workstations.
- 128 PCIe 4.0 Lanes: Connection for multiple GPUs, NVMe storage, and RAID controllers.
- PRO Technologies: Secure Memory Encryption, Secure Boot.
2. Compatible Motherboards
Socket and Chipsets
- Socket: sWRX8 (only for Threadripper PRO).
- Chipset: WRX80.
Model Examples:
- ASUS Pro WS WRX80E-SAGE SE ($650–$800): 8 PCIe 4.0 x16 slots, 8 SATA ports, 10 Gigabit Ethernet.
- Gigabyte WRX80 SU8 ($600–$750): 7 PCIe 4.0 slots, support for 2x 10 Gigabit LAN.
Selection Features:
- Check for active cooling of the chipset — due to high loads, it may overheat.
- For builds with multiple GPUs, choose boards with reinforced PCIe slots (e.g., steel shields).
3. Supported Memory Types
- Type: DDR4 (does not support DDR5).
- Modes: Quad-channel.
- Frequencies: Up to 3200 MHz (without overclocking), up to 3600 MHz (with overclocking).
- Maximum Capacity: 2 TB (8 slots × 256 GB).
Recommendations:
- Use kits with ECC, such as Kingston Server Premier DDR4-3200 64GB ECC ($220 per module).
- For non-ECC, G.Skill Trident Z Neo DDR4-3600 ($150 for 32 GB) will suffice.
4. Power Supply Recommendations
- Minimum Power: 850 W (for a single GPU system).
- Optimal Choice: 1000–1200 W (with headroom for upgrades).
- Certification: 80+ Platinum or Titanium.
Examples:
- Corsair AX1200i ($300): Digital control, 94% efficiency.
- Seasonic PRIME TX-1000 ($280): 12-year warranty.
Tip: Don't skimp on cables! Use original modular wires to avoid overload.
5. Pros and Cons
Pros:
- Multi-threaded Power: 32 threads easily handle rendering and simulations.
- PRO Features: ECC, memory encryption, remote management.
- Scalability: 128 PCIe 4.0 lanes for NVMe arrays and GPUs.
Cons:
- Price: The CPU itself costs $1100–$1300 (new), motherboards start at $600.
- Power Consumption: 280 W requires robust cooling.
- Overkill for Gaming: In gaming, it lags behind the Ryzen 9 7950X due to lower clock speeds (up to 4.3 GHz).
6. Use Cases
Professional Tasks:
- 3D Rendering: In Redshift or V-Ray, 16 cores run at 100%, reducing render times.
- Virtualization: Running 5–7 VMs simultaneously without lag (for example, software testing).
- Scientific Calculations: Data analysis in MATLAB or Python (NumPy).
Gaming:
The processor can handle 4K gaming, but it is not the optimal choice:
- In Cyberpunk 2077 (Ultra, 4K), the average FPS is 78 (compared to 95 for the Ryzen 7 7800X3D).
Multimedia:
- Encoding 8K video in DaVinci Resolve: 1 hour of footage processed in 12 minutes.
7. Competition Comparison
Intel Xeon W-3375 ($1500):
- 38 cores, 76 threads, but TDP 270 W.
- Lags in single-core performance (Geekbench 6 Single: 1450).
- Only 64 PCIe 4.0 lanes.
AMD Ryzen 9 7950X ($700):
- 16 cores, 32 threads, but lacks ECC and PRO features.
- Better for gaming (clock speeds up to 5.7 GHz).
Conclusion: The 3955WX outperforms the Xeon in energy efficiency and the Ryzen 9 in professional features.
8. Practical Assembly Tips
Cooling:
- Options:
- AIO: Arctic Liquid Freezer II 420 ($120).
- Cooler: Noctua NH-U14S TR4-SP3 ($90).
Important: The cooler must cover the entire heat spreader (TR4-SP3).
Case:
- Choose models that support E-ATX and offer good ventilation:
- Fractal Design Define 7 XL ($230): 8 fan slots.
- Lian Li PC-O11 Dynamic ($170): for AIO cooling with top installation.
Additions:
- Storage: 2x WD Black SN850X 2TB ($300 each) in RAID 0 to speed up workflows.
9. Final Conclusion: Who Should Choose the 3955WX?
You should choose this processor if you:
1. Are a professional in 3D/CAD/video editing: Multi-threading and PCIe 4.0 will speed up rendering.
2. Develop software: Virtualization and ECC memory will provide stability.
3. Are building a server: Support for 2 TB of RAM and 128 PCIe lanes is relevant for NAS or storage arrays.
For gaming or office tasks, the 3955WX is overkill; Ryzen 7 or Core i7 would be better suited.
Price of the new processor in 2025: $1100–$1300.
Cost of a complete build: starting from $3000 (excluding GPU).
If you need maximum reliability and performance for professional tasks, the Threadripper PRO 3955WX remains one of the best choices even four years after its release.