AMD Ryzen 9 3900XT vs AMD Ryzen 9 7900X

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Ryzen 9 3900XT compared with Ryzen 9 7900X

	AMDRyzen 9 3900XT	AMDRyzen 9 7900X
Overview
Released
Released	July 2020	September 2022
Cores and clocks
Cores
Cores	12	12
Threads
Threads	24	24
Base clock
Base clock	3.8 GHz	4.7 GHz
Boost clock
Boost clock	4.7 GHz	5.6 GHz (better)
L3 cache
L3 cache	64 MB	64 MB
Cores
Cores	Zen 2; Matisse	Zen 4; Raphael; 3 package dies; simultaneous multithreading
Clocks
Clocks	–	Precision Boost 2; Precision Boost Overdrive and Curve Optimizer supported
Cache
Cache	L2 6 MB	L1 768 KB; L2 12 MB; L3 64 MB
Graphics and AI
Built-in graphics
Built-in graphics	No	Yes
Graphics
Graphics	A separate graphics card is required	AMD Radeon Graphics; 2 graphics cores at 2200 MHz; USB-C DisplayPort Alternate Mode supported
Platform
Socket
Socket	AM4	AM5
Base power
Base power	105 W	170 W
Unlocked
Unlocked	Yes	Yes
Cooler in the box
Cooler in the box	No	No
Memory support
Memory support	DDR4; up to 3200 MT/s	DDR5 UDIMM; 2 memory channels; maximum 128 GB; ECC requires motherboard support. 2 single- or dual-rank DIMMs: DDR5-5200; 4 single- or dual-rank DIMMs: DDR5-3600; AMD EXPO memory overclocking supported
PCIe
PCIe	PCIe 4.0	PCIe 5.0; 28 native lanes, 24 usable (generation from AMD launch release; current technical page omits it); 4 native USB 3.2 Gen 2 ports, 1 USB 2.0 port; no native SATA ports
Chipsets
Chipsets	–	A620, X670E, X670, B650E, B650, X870E, X870, B840 and B850
Process
Process	TSMC 7nm FinFET	TSMC 5nm FinFET CPU cores; TSMC 6nm FinFET I/O die; CPU compute die 71 mm², I/O die 122 mm²
Cooler
Cooler	No cooler included; AMD recommends a liquid cooler with at least a 280 mm radiator or equivalent air cooling; Tjmax 95°C	Not included; Tjmax 95°C; AMD recommends liquid cooling for optimal performance