AMD Ryzen 9 3900X vs AMD Ryzen 9 3950X

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Ryzen 9 3900X compared with Ryzen 9 3950X

	AMDRyzen 9 3900X	AMDRyzen 9 3950X
Overview
Released
Released	July 2019	November 2019
Cores and clocks
Cores
Cores	12	16 (better)
Threads
Threads	24	32 (better)
Base clock
Base clock	3.8 GHz	3.5 GHz
Boost clock
Boost clock	4.6 GHz	4.7 GHz (better)
L3 cache
L3 cache	64 MB	64 MB
Cores
Cores	Zen 2; Matisse; twelve cores with simultaneous multithreading. Two CPU chiplets with six active cores each and a separate I/O die (PCGamesN).	Zen 2; Matisse; sixteen cores with simultaneous multithreading. Two fully enabled eight-core CPU chiplets (PC Perspective).
Clocks
Clocks	Unlocked for overclocking; Precision Boost Overdrive with Automatic Overclocking supported, as described in AMD's launch notice.	Unlocked for overclocking; Precision Boost 2.
Cache
Cache	768 KB L1; 6 MB L2; 64 MB L3.	1024 KB L1; 8 MB L2; 64 MB L3.
Graphics and AI
Built-in graphics
Built-in graphics	No	No
Graphics
Graphics	No integrated graphics; a separate graphics card is required.	No integrated graphics; a separate graphics card is required.
Platform
Socket
Socket	AM4	AM4
Base power
Base power	105 W	105 W
Unlocked
Unlocked	Yes	Yes
Cooler in the box
Cooler in the box	Yes	No
Memory support
Memory support	DDR4; two channels; up to 3200 MT/s.	DDR4 UDIMM; two channels; up to 128 GB. Two single-rank or dual-rank modules support 3200 MT/s; four single-rank modules 2933 MT/s and four dual-rank modules 2667 MT/s. ECC requires motherboard support.
PCIe
PCIe	PCIe 4.0 x16; AMD introduced PCIe 4.0 support with the X570 platform at launch.	PCIe 4.0; 24 native lanes in total, 20 usable. X570 adds 16 usable PCIe 4.0 lanes.
Chipsets
Chipsets	X570 at launch; check the motherboard's CPU support list and BIOS for other AM4 boards.	AMD lists X570, X470, X370 and B450; check the motherboard's CPU support list and BIOS.
Process
Process	TSMC 7nm FinFET CPU cores; 14nm I/O die (PCGamesN).	TSMC 7nm FinFET CPU cores.
Cooler
Cooler	Retail boxed processor includes an RGB cooler (PCGamesN; inclusion also confirmed by TechRadar); AMD's current support specification does not name a cooler. Maximum operating temperature 95°C.	No cooler included; liquid cooling recommended. AMD's November launch notice recommends an AIO with at least a 280 mm radiator. Maximum operating temperature 95°C.