What is the best motherboard for this processor?

This CPU works in many motherboards. I have an Asrock X370 Taichi in which this 3000 series CPU is the most powerful than can be used. This CPU can be used in an X570, 2 generations newer. Your question is backwards. What motherboard is best for your purposes? What CPU can you afford?

Where it says "Memory Types: DDR4 3200" does that mean it only takes that type/speed ? I already have 16GB of DDR4 4400 that I am trying to use.

u may be abel to change the speed in the bios with xmp

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AMD Ryzen 7 3rd Gen - Ryzen 7 3800X Matisse (Zen 2) 8-Core 3.9 GHz Socket AM4 105W 100-100000025BOX Desktop Processor

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7nm Matisse (Zen 2) 105W
32MB L3 Cache
4MB L2 Cache
None Integrated Graphics

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Model
Brand	AMD
Processors Type	Desktop
Series	Ryzen 7 3rd Gen
Name	Ryzen 7 3800X
Model	100-100000025BOX

Details
CPU Socket Type	Socket AM4
Core Name	Matisse (Zen 2)
# of Cores	8-Core
# of Threads	16-Threads
Operating Frequency	3.9 GHz
Max Turbo Frequency	4.5 GHz
L2 Cache	4MB
L3 Cache	32MB
Manufacturing Tech	7nm
Instruction Set	64-Bit
Memory Types	DDR4 3200
Memory Channel	2
Integrated Graphics	None Integrated Graphics
PCI Express Revision	4.0 / 3.0
Max Number of PCI Express Lanes	16
Thermal Design Power	105W
Cooling Device	Heatsink and fan included
Operating System Supported	Windows 11

Additional Information
First Listed on Newegg	September 08, 2026

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Item#: 9SIA8N2M6B3190

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AMD Ryzen 7 3rd Gen - Ryzen 7 3800X Matisse (Zen 2) 8-Core 3.9 GHz Socket AM4 105W 100-100000025BOX Desktop Processor

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