AMD · Threadripper

Ryzen Threadripper PRO 3955WX

Released September 2020

A 16-core Zen 2 workstation processor for sWRX8, with eight-channel DDR4 memory, 64 MB L3 cache and PCIe 4.0.

Cores: 16/32
Boost: 4.3 GHz
L3: 64 MB
Power: 280 W
Socket: sWRX8

What reviewers say

Reviewers see the 3955WX as an entry point to workstation memory capacity and connectivity, rather than a reason to buy for core count alone. It competes well with Intel’s Xeon W parts, but cheaper mainstream Ryzen processors offer similar performance in many tasks; ServeTheHome considers the larger PRO models better balanced for this platform.

From servethehome.com and medium.com

Specifications

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Cores and clocks

Cores: 16
Threads: 32
Base clock: 3.9 GHz
Boost clock: 4.3 GHz
L3 cache: 64 MB
Cores: Castle Peak; Zen 2. Boxed product ID 100-100000167WOF; tray ID 100-000000167. Announced 14 July 2020. Lenovo stated September 2020 availability for the first ThinkStation P620 systems, and confirmed them shipping on 14 October. Release is kept at OEM month precision; an exact first-sale day for this model is unpublished. AMD later announced March 2021 standalone retail availability for this model.
Clocks: Precision Boost 2; maximum boost up to 4.3 GHz. Locked for overclocking.
Cache: L1 1024 KB; L2 8 MB; L3 64 MB

Graphics and AI

Built-in graphics: No
Graphics: A separate graphics card is required

Platform

Socket: sWRX8
Base power: 280 W
Unlocked: No
Memory support: DDR4; eight channels; up to 3200 MT/s. AMD’s exact-model launch table supports up to 2 TB ECC UDIMM, RDIMM or LRDIMM memory; motherboard and system limits can be lower.
PCIe: PCIe 4.0; AMD’s exact-model launch table lists 128 lanes
Process: CPU cores: TSMC 7 nm FinFET
Cooler: AMD’s current specification does not state whether a cooler is included. Maximum operating temperature 90°C.

Pros and cons

Pros

16 cores and 32 threads
Eight-channel memory with ECC support
PCIe 4.0 expansion support

Cons

280 W TDP
Requires a compatible workstation motherboard
No integrated graphics

Closest rivals

Model	Cores	Boost	L3	Power	Socket	Released
AMDRyzen Threadripper PRO 3945WX	12/24	4.3 GHz	64 MB	280 W	sWRX8	Sept 2020
IntelCore i9-10980XE	18/36	4.8 GHz	24.75 MB	165 W	LGA2066	Nov 2019
IntelCore i9-10940X	14/28	4.8 GHz	19.25 MB	165 W	LGA2066	2019

Sources

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