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AMD Ryzen Threadripper PRO 3955WX vs AMD Ryzen Threadripper PRO 3975WX: Comparison
Ryzen Threadripper PRO 3955WX vs Ryzen Threadripper PRO 3975WX: the l3 cache difference
Start with l3 cache, because it is the widest measured gap between them: Ryzen Threadripper PRO 3955WX 64 MB against Ryzen Threadripper PRO 3975WX 128 MB, 50% in favour of Ryzen Threadripper PRO 3975WX. SPECrate® 2017 Integer (base), 1-chip backs the spec sheet up. Ryzen Threadripper PRO 3975WX scores 255 to 133, 48% clear. Ryzen Threadripper PRO 3975WX also leads on l2 cache, 8 MB on the Ryzen Threadripper PRO 3955WX versus 16 MB on the Ryzen Threadripper PRO 3975WX. They differ on base clock too, 3.9 GHz on the Ryzen Threadripper PRO 3955WX versus 3.5 GHz on the Ryzen Threadripper PRO 3975WX. Memory support is not the same on both, DDR4, 8-Channel, Up to 3200 MT/s on the Ryzen Threadripper PRO 3955WX versus DDR4-3200 ECC RDIMM on the Ryzen Threadripper PRO 3975WX.
Ryzen Threadripper PRO 3955WX vs Ryzen Threadripper PRO 3975WX: which one fits your build
The Ryzen Threadripper PRO 3955WX suits mainstream desktop builds and everyday productivity, though it is the wrong buy for extreme overclocking (unless K/X-series) and workstation-class multi-threaded workloads. Take the Ryzen Threadripper PRO 3975WX for professional workstation workloads needing genuine 32-core, 64-thread single-socket throughput without the top-tier 64-core price. Avoid it for anyone outside professional workstation use, this is specialized, expensive hardware far beyond consumer needs.
What Ryzen Threadripper PRO 3955WX and Ryzen Threadripper PRO 3975WX have in common
The common ground is wider than the gap: tdp, memory channels, release year, socket and max memory speed are identical here. They match on 1 further specification as well.
Frequently asked questions
Do the Ryzen Threadripper PRO 3955WX and Ryzen Threadripper PRO 3975WX differ on boost clock?
Yes. Boost Clock reads Up to 4.3 GHz on the Ryzen Threadripper PRO 3955WX versus 4.2 GHz on the Ryzen Threadripper PRO 3975WX.
Is the PCIe Generation the same on the Ryzen Threadripper PRO 3955WX and Ryzen Threadripper PRO 3975WX?
It is. Both are listed at PCIe 4.0, so it is not a reason to pick one over the other.
Specs and benchmarks
Release Year
- AMD Ryzen Threadripper PRO 3955WX
- 2020
- AMD Ryzen Threadripper PRO 3975WX
- 2020
Core Count
- AMD Ryzen Threadripper PRO 3955WX
- 16 cores
- AMD Ryzen Threadripper PRO 3975WX
- 32 cores
Thread Count
- AMD Ryzen Threadripper PRO 3955WX
- 32 threads
- AMD Ryzen Threadripper PRO 3975WX
- 64 threads
Base Clock
- AMD Ryzen Threadripper PRO 3955WX
- 3.9 GHz
- AMD Ryzen Threadripper PRO 3975WX
- 3.5 GHz
Boost Clock
- AMD Ryzen Threadripper PRO 3955WX
- Up to 4.3 GHz
- AMD Ryzen Threadripper PRO 3975WX
- 4.2 GHz
L2 Cache
- AMD Ryzen Threadripper PRO 3955WX
- 8 MB-50%
- AMD Ryzen Threadripper PRO 3975WX
- 16 MBBest
L3 Cache
- AMD Ryzen Threadripper PRO 3955WX
- 64 MB-50%
- AMD Ryzen Threadripper PRO 3975WX
- 128 MBBest
Socket
- AMD Ryzen Threadripper PRO 3955WX
- sWRX8
- AMD Ryzen Threadripper PRO 3975WX
- sWRX8
Memory Channels
- AMD Ryzen Threadripper PRO 3955WX
- 8 channels
- AMD Ryzen Threadripper PRO 3975WX
- 8 channels
Max Memory Speed
- AMD Ryzen Threadripper PRO 3955WX
- 3200 MT/s
- AMD Ryzen Threadripper PRO 3975WX
- 3200 MT/s
PCIe Generation
- AMD Ryzen Threadripper PRO 3955WX
- PCIe 4.0
- AMD Ryzen Threadripper PRO 3975WX
- PCIe 4.0
TDP
- AMD Ryzen Threadripper PRO 3955WX
- 280 W
- AMD Ryzen Threadripper PRO 3975WX
- 280 W
Memory Support
- AMD Ryzen Threadripper PRO 3955WX
- DDR4, 8-Channel, Up to 3200 MT/s
- AMD Ryzen Threadripper PRO 3975WX
- DDR4-3200 ECC RDIMM
Benchmarks
- General CPU
SPECrate® 2017 Integer (base), 1-chip
- AMD Ryzen Threadripper PRO 3955WX
- 133-48%
- AMD Ryzen Threadripper PRO 3975WX
- 255Best
Best published 1-chip result on spec.org, retrieved 23 Sept 2026.
Server-style tasks like compiling and compression on every thread. Best for judging workstation and server work.
SPECrate® 2017 Floating Point (base), 1-chip
- AMD Ryzen Threadripper PRO 3955WX
- 115-45%
- AMD Ryzen Threadripper PRO 3975WX
- 209Best
Best published 1-chip result on spec.org, retrieved 23 Sept 2026.
Scientific and engineering tasks on every thread. Rewards core count and memory bandwidth.
SPEC®, SPECrate® and SPECspeed® are registered trademarks of the Standard Performance Evaluation Corporation. Copied by permission of the Standard Performance Evaluation Corporation (SPEC). Results retrieved from www.spec.org on 23 Sept 2026.
Which one should you pick?
Choose 3955WX if you want the higher memory channels (8 channels vs 8 channels).
Choose 3975WX if you want the higher L2 cache (16 MB vs 8 MB), the higher L3 cache (128 MB vs 64 MB) and the higher SPECrate® 2017 integer (base), 1-chip (255 vs 133).