Quick Verdict
An extremely powerful workstation CPU that trades blows with top Xeon parts in multi-threaded workloads while offering substantially more PCIe 5.0 lanes and memory bandwidth, but it comes at a very high price and requires robust cooling and platform investment.
Overview
Launch
2025
Status
LaunchedGeneration
Ryzen Threadripper PRO 9000 WX-Series (Zen 5)
Market
Workstation
The AMD Ryzen Threadripper PRO 9985WX is a 64-core, 128-thread Zen 5 workstation processor on the sTR5 platform, designed for heavy multi-threaded workloads such as VFX rendering, scientific simulation, and large-scale AI development, with 8-channel DDR5-6400 and up to 148 PCIe 5.0 lanes.
Based on AMD’s 4nm Zen 5 Shimada Peak silicon, the 9985WX pairs 64 cores and 128 threads with a 3.2 GHz base and up to 5.4 GHz boost, 256 MB of L3 cache, and a 350 W TDP.
It supports 8-channel DDR5-6400 ECC RDIMMs up to 2 TB and up to 148 PCIe 5.0 lanes (128 Gen5) on WRX90, making it well-suited for heavy rendering, simulation, and local AI workloads. It is not a gaming-first or efficiency-focused part; it is designed for sustained, bandwidth-heavy professional compute.
Specifications
Performance
Exceptional multi-threaded performance for professional applications; competes with or exceeds top Xeon workstation CPUs in many rendering and compilation workloads.
Excellent for running many VMs or containers simultaneously, thanks to 128 threads, 8-channel memory, and massive PCIe connectivity.
Capable of high-refresh-rate gaming at 1440p and 4K in CPU-heavy titles, but not its focus; mainstream high-end desktop CPUs often match or beat it in gaming while costing far less.
High absolute performance but also high power draw; efficiency per watt is not a strength versus lower-core mainstream or server alternatives.
- •Strong single-thread performance thanks to Zen 5 and 5.4 GHz boost.
- •More than capable for 1440p/4K gaming with a high-end GPU.
- •Significantly more expensive and power-hungry than gaming-focused desktop CPUs.
- •Best suited for gaming as a secondary task on a workstation that also does heavy compute.
- •Good for CPU-based AI inference and model development, especially with 8-channel memory bandwidth.
- •Lacks dedicated matrix or AI accelerators found in some newer server and workstation CPUs.
- •Best for hybrid workflows combining local CPU inference with remote GPU or cloud acceleration.
Architecture
TSMC 4nm FinFET
Process Node
Shimada Peak
Codename
64C / 128T
Core Config
256 MB
L3 Cache
350 W
TDP
Architecture Overview
The Ryzen Threadripper PRO 9985WX uses AMD’s Zen 5 microarchitecture on the 4nm Shimada Peak silicon, repackaging EPYC-derived compute dies into a workstation-focused sTR5 platform with enhanced I/O and security features.
CPU Design
64 Zen 5 CPU cores organized in CCDs with 32 MB L3 per CCD (8 CCDs × 32 MB = 256 MB L3), each core supporting SMT for 128 threads. The large L3 and high core count target throughput-heavy workloads.
Memory Subsystem
8-channel DDR5 interface supporting ECC RDIMMs up to DDR5-6400, with up to 2 TB capacity on WRX90/TRX50. Peak theoretical bandwidth up to 410 GB/s in an 8-channel configuration, greatly benefiting bandwidth-sensitive workloads like simulation and large dataset processing.
PCIe & I/O
Up to 148 total PCIe lanes from the CPU (144 usable, 128 PCIe 5.0) when paired with WRX90, enabling multi-GPU, NVMe RAID, and high-speed networking configurations. TRX50 limits PCIe and memory channels for HEDT use.
Overclocking
Unlocked multiplier for enthusiast tuning, but practical headroom is limited by the 350 W TDP and thermal constraints; most users will rely on Precision Boost and EXPO rather than manual overclocking.
- Zen 5 IPC uplift and higher boost clocks versus Zen 4 Storm Peak.
- Higher official DDR5 speed (6400 vs 5200 MT/s) and 8-channel support retained.
- Full PCIe 5.0 lane count from CPU instead of relying heavily on chipset.
- Refined power management and PRO feature set under the 9000 WX-Series branding.
Key Highlights
- 64 Zen 5 cores and 128 threads for extreme multi-threaded throughput.
- 8-channel DDR5-6400 with ECC and up to 2 TB capacity for large datasets.
- Up to 148 PCIe 5.0 lanes (128 Gen5) for multi-GPU and NVMe RAID configurations.
- AMD PRO technologies for security, encryption, and remote management.
- Unlocked multiplier for enthusiast tuning.
- Significant IPC uplift over prior Zen 4 Threadripper PRO generation.
- Very high platform cost (CPU, WRX90/TRX50 motherboard, 8-channel DDR5 RDIMMs).
- 350 W TDP requires robust cooling and a high-quality power supply.
- Efficiency per watt is unremarkable compared to lower-core alternatives.
- No integrated graphics; discrete GPU required for display.
- Overkill for gaming and light productivity workloads.
History
The Ryzen Threadripper PRO 9985WX is part of AMD’s Threadripper PRO 9000 WX-Series, launched on July 23, 2025 as the direct successor to the Zen 4-based 7985WX. It brings AMD’s Zen 5 architecture—first introduced in Ryzen 9000 desktop CPUs—to the workstation platform under the Shimada Peak codename, repackaging EPYC-derived compute dies into the sTR5 socket. Compared to the prior generation, it offers higher IPC, faster DDR5 support, and a full PCIe 5.
0 lane count from the CPU, cementing AMD’s position in the high-end workstation segment against Intel’s Xeon W9 and Xeon W5 families. The 9985WX specifically targets users who need 64+ cores and 8-channel memory bandwidth, but don’t require the flagship 96-core 9995WX.
Improvements over Previous Generation
- Zen 5 IPC uplift and higher boost clocks versus Zen 4 Storm Peak.
- Higher official DDR5 speed (6400 vs 5200 MT/s) and 8-channel support retained.
- Full PCIe 5.0 lane count from CPU instead of relying heavily on chipset.
- Refined power management and PRO feature set under the 9000 WX-Series branding.
Alternatives & Competitors
Should You Buy It?
Recommended for the right buyer
Building or upgrading a professional workstation for 3D rendering, simulation, AI development, or virtualization where you need 64+ cores, 8-channel memory, and massive PCIe 5.0 expansion.
Avoid if…
- Primary use is gaming with no serious professional compute workload.
- You are highly sensitive to power consumption or heat output.
- Your workload fits comfortably in 16–32 cores and 4 memory channels.
- You cannot justify the platform cost (CPU + WRX90/TRX50 motherboard + 8-channel DDR5 RDIMMs + high-end cooling).
Use Cases
Interesting Facts
Shimada Peak is the codename for the Zen 5-based Threadripper 9000/PRO 9000 WX silicon, derived from AMD’s EPYC Turin server chips repackaged for the sTR5 workstation platform.
The 9985WX’s 148/144/128 PCIe lane count is among the highest available on any workstation CPU, enabling exotic multi-GPU and storage configurations.
Geekbench 6 shows a ~3,270 single-core and ~31,233 multi-core score for the 9985WX, placing it near the top of workstation-class CPUs.
The 8-channel DDR5-6400 interface can deliver up to 410 GB/s of memory bandwidth in a fully populated configuration.
Unlike some earlier Threadripper generations, the PRO 9000 WX-Series uses a distinct package with four additional compute dies compared to the non-Pro HEDT parts, rather than simply disabling cores on the same silicon.
AMD claims up to a 16% geomean uplift in workstation benchmarks and up to 25% in SPEC AI/ML workloads versus the Zen 4 Threadripper PRO 7000 WX-Series.
Retail listings such as B&H Photo have priced the 9985WX around $7,499–$8,299 USD, reflecting its enterprise-grade positioning.
The 9985WX can address up to 2 TB of DDR5 RDIMM memory across 8 channels, far exceeding typical desktop capacity limits.
The sTR5 socket is shared between Threadripper 9000 HEDT and PRO 9000 WX CPUs, but PRO parts require WRX90 to unlock full I/O and memory channel count.
Even at 350 W TDP, the 9985WX can boost to 5.4 GHz on lightly loaded threads, balancing high single-thread performance with massive multi-thread capability.
People Also Ask
Is the AMD Ryzen Threadripper PRO 9985WX good for gaming?
It is more than capable for high-refresh-rate gaming at 1440p/4K, but it is not a gaming-focused CPU. Mainstream high-end desktop CPUs like the Ryzen 9 9950X or Intel Core i9 offer similar or better gaming performance for far less money and power.
How much RAM does the Ryzen Threadripper PRO 9985WX support?
On a compatible WRX90 or TRX50 motherboard with 8 DDR5 RDIMM slots, it can support up to 2 TB of DDR5-6400 ECC memory.
How many PCIe lanes does the 9985WX have?
It provides up to 148 total PCIe lanes from the CPU, with 144 usable and 128 of those as PCIe 5.0, when used with WRX90 motherboards.
Does the 9985WX have integrated graphics?
No, it does not have integrated graphics. A discrete GPU is required for display output.
What socket does the Ryzen Threadripper PRO 9985WX use?
It uses the AMD sTR5 socket, shared with other Ryzen Threadripper 9000 and PRO 9000 WX processors.
Is the 9985WX better than the 7985WX?
Yes, the 9985WX is based on the newer Zen 5 architecture with higher IPC and boost clocks, plus official DDR5-6400 support. It generally offers better performance at similar or slightly higher power, but at a higher price.
Can you overclock the Ryzen Threadripper PRO 9985WX?
Yes, it has an unlocked multiplier and can be overclocked, but practical headroom is limited by the 350 W TDP and thermal solution.
What chipsets are compatible with the 9985WX?
It is compatible with AMD WRX90 and TRX50 chipsets, with WRX90 enabling full 8-channel memory and maximum PCIe lane count.
Is the 9985WX good for AI workloads?
It is very good for CPU-based AI inference, data preprocessing, and hybrid CPU+GPU workflows, especially with 8-channel memory bandwidth, but it lacks dedicated AI accelerators and is not a replacement for high-end GPU or dedicated AI accelerators.
How does the 9985WX compare to Intel Xeon w9-3495X?
The 9985WX offers more cores (64 vs 56), higher memory bandwidth (8-channel DDR5 vs Xeon’s 8-channel DDR5 but often at lower official speeds), and more PCIe 5.0 lanes. The Xeon may have advantages in per-core performance and software optimization in some ISV applications.
Frequently Asked Questions
Does the Ryzen Threadripper PRO 9985WX support ECC memory?
Yes, it supports DDR5 ECC RDIMMs, which is important for mission-critical workloads where data integrity matters.
What cooling is recommended for the 9985WX?
A high-end 360mm (or larger) AIO liquid cooler or a robust custom loop is recommended to handle the 350 W TDP under sustained multi-threaded load.
Can I use the 9985WX on a TRX50 motherboard?
Yes, TRX50 motherboards are supported, but they limit memory to 4 channels and reduce total PCIe lane count compared to WRX90.
Is the 9985WX suitable for small-form-factor builds?
No. The 350 W TDP, large sTR5 package, and need for robust cooling and power delivery make it best suited for full-tower or rackmount workstation enclosures.
Does the 9985WX come with a cooler?
No, it is shipped as a processor-only unit; a separate cooling solution is required.
What is the max boost clock of the 9985WX?
The maximum boost clock is up to 5.4 GHz on lightly loaded threads.
How does the 9985WX differ from the 9980X?
The 9985WX is a PRO model with 8-channel memory, AMD PRO technologies, and higher official DDR5 speeds; the 9980X is a HEDT part with 4-channel memory and fewer PCIe lanes, targeted at enthusiasts rather than enterprise workstations.
Is the 9985WX good for video editing?
Yes, it is excellent for video editing, especially 8K or multi-stream 4K workflows, thanks to its many cores, high memory bandwidth, and support for multiple GPUs.
Can I run multiple GPUs with the 9985WX?
Yes, with up to 148 PCIe lanes (128 Gen5), you can run several high-end GPUs plus fast NVMe storage without running out of lanes, particularly on WRX90.
What is the default TDP of the 9985WX?
The default TDP is 350 W, the same as the maximum TDP for this SKU.