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Square ceramic chip with gold contacts and silver heat spreader labelled Ryzen 9 3900X

AMD

AMD Ryzen 9 3900X 12-Core 3.8 GHz desktop processor

SKU CH-9BD3-1B1C2

12-core desktop processor with 24 threads, 3.8 GHz base clock, 4.6 GHz max boost, 64 MB L3 cache and 105 W TDP for Socket AM4 motherboards

  • Product nameRyzen 9 3900X
  • CPU cores12-Core
  • CPU socketSocket AM4
  • TDP rating105 W
  • Processor classDesktop
  • Processor codenameMatisse (Zen 2)
  • 12 cores and 24 threads for heavy multi-threaded workloads
  • 8 GHz base clock with 4.6 GHz max boost for strong single-thread speed
  • 64 MB L3 cache reduces latency in data-intensive tasks
  • 105 W TDP fits standard AM4 cooling solutions
  • PCIe 4.0 support with 16 lanes enables high-speed storage and GPUs

12-Core Ryzen 9 3900X for desktop builds

This 12-core processor targets content creators and multitaskers who need sustained throughput on Socket AM4. With 24 threads and a 3.8 GHz base clock it moves through rendering, compilation and heavy multitasking without bottlenecks. The 7 nm Matisse architecture keeps power draw at 105 W while delivering 4.6 GHz max boost for burst workloads. Windows 11 support is confirmed.

64 MB L3 cache and PCIe 4.0 headroom

The 64 MB L3 cache feeds all 12 cores during large dataset work, while 6 MB L2 handles per-core hot data. Dual-channel DDR4 memory scales bandwidth for memory-bound tasks. Sixteen PCIe lanes at revision 4.0 or 3.0 give fast GPU and storage connectivity until the lane budget is exhausted. Heavily threaded loads saturate the 105 W envelope, so sustained clocks settle below the 4.6 GHz peak.

Bundled Wraith Prism cooler enables immediate

The included Wraith Prism cooler mounts directly on Socket AM4 without extra hardware, letting builders boot straight into the OS. RGB lighting on the cooler is controllable through motherboard software for basic aesthetics. No thermal paste tube or mounting brackets are supplied, so reuse existing compound or source separately. The processor ships without original retail packaging or manual.

How it compares

Measured against everything we stock in Desktop Processors, at today’s prices. Recalculated every night.

Price $180.99
Pricier than about 57% of the 494 comparable items (median $149.99).
CPU cores 12-Core
Higher than about 60% of the 271 comparable items (median 8).
TDP rating 105 W
Higher than about 60% of the 320 comparable items (median 95 W).

New to this? Buying a processor with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameAMD
Product lineRyzen 9 3rd Gen
Product nameRyzen 9 3900X
Performance
Working frequency3.8 GHz
Processor
CPU cores12-Core
CPU socketSocket AM4
TDP rating105 W
Processor classDesktop
Processor codenameMatisse (Zen 2)
CPU threads24-Threads
Level 2 cache6 MB
Level 3 cache64 MB
Process node7 nm
CPU instruction set64-Bit
Virtualization supportYes
Max PCIe lanes16
Memory
Channel configuration2
Ports & slots
PCIe generation4.0 / 3.0
Compatibility
Compatible systemsWindows 11
In the box
Included coolerNot included - Processor Only

Questions about this item

Will my existing AM4 motherboard and DDR4 memory work with the Ryzen 9 3900X?

The processor uses the Socket AM4 interface and supports DDR4 memory in dual-channel mode, so current AM4 boards and DDR4 modules are compatible.

How can I confirm the 12-core chip is hitting its 4.6 GHz max boost after installation?

Monitor per-core clocks under single-threaded load; you should see frequencies reach 4.6 GHz on one or two cores while the 105 W TDP is respected.

Does the 100-100000023BOX package include a cooler or do I need to buy one separately?

The supplier notes no cooler is included and the CPU ships without the original box or manual, so a separate AM4-compatible cooler is required.

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