AMD Ryzen Threadripper PRO 3945WX vs AMD Ryzen Threadripper PRO 9965WX

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Ryzen Threadripper PRO 3945WX compared with Ryzen Threadripper PRO 9965WX

	AMDRyzen Threadripper PRO 3945WX	AMDRyzen Threadripper PRO 9965WX
Overview
Released
Released	September 2020	July 2025
Cores and clocks
Cores
Cores	12	24 (better)
Threads
Threads	24	48 (better)
Base clock
Base clock	4 GHz	4.2 GHz
Boost clock
Boost clock	4.3 GHz	5.4 GHz (better)
L3 cache
L3 cache	64 MB	128 MB (better)
Cores
Cores	Castle Peak; Zen 2. Tray ID 100-000000168. 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 Release is kept at OEM month precision; an exact first-sale day for this model is unpublished. The socket is sWRX8 according to LDLC’s exact tray listing; AMD’s current support page omits it.	Shimada Peak; Zen 5 architecture. Boxed 100-100000724WOF; tray 100-000000724. AMD’s 17 July 2025 blog names this model and says PRO 9000 systems are available starting 23 July; announcement and on-sale dates are distinct.
Clocks
Clocks	Precision Boost 2; maximum boost up to 4.3 GHz. Locked for overclocking.	Precision Boost 2; Precision Boost Overdrive and Curve Optimizer voltage offsets supported
Cache
Cache	L1 768 KB; L2 6 MB; L3 64 MB	L1 1920 KB; L2 24 MB
Graphics and AI
Built-in graphics
Built-in graphics	No	No
Graphics
Graphics	A separate graphics card is required	A separate graphics card is required
Platform
Socket
Socket	sWRX8	sTR5
Base power
Base power	280 W	350 W
Unlocked
Unlocked	No	Yes
Cooler in the box
Cooler in the box	–	No
Memory support
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.	DDR5 RDIMM; eight channels; up to 6400 MT/s. ECC enabled by default; AMD EXPO supported. WRX90 supports up to 2 TB; TRX50 reduces this to four channels and up to 1 TB.
PCIe
PCIe	PCIe 4.0; AMD’s exact-model launch table lists 128 lanes	PCIe 5.0; 148 native/platform lanes, 144 usable, including 128 PCIe 5.0 lanes with WRX90. TRX50 limits expansion to 92 total/88 usable lanes, including 80 PCIe 5.0. Four native USB 3.2 Gen 2 ports and four SATA ports; NVMe boot and RAID 0, 1, 5 and 10 supported.
Chipsets
Chipsets	–	WRX90, TRX50 and AMD PRO 695; AMD PRO technologies, DASH management and AMD Memory Guard supported. Platform capabilities depend on the motherboard; AMD’s platform guide says OEM systems do not support overclocking.
Process
Process	CPU cores: TSMC 7 nm FinFET	CPU cores: TSMC 4 nm FinFET; I/O die: TSMC 6 nm FinFET. 5 package dies.
Cooler
Cooler	AMD’s current specification does not state whether a cooler is included. Maximum operating temperature 90°C.	Cooler not included; maximum operating temperature 95°C