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Square green ceramic chip with gold contacts and silver heatspreader, AMD Ryzen 9 9900X branding

AMD

AMD Ryzen 9 9900X desktop processor

SKU CH-RXK2-6KB1W

12-core desktop processor with 24 threads, 4.4 GHz base clock, 5.6 GHz max boost, 64 MB L3 cache, DDR5-5600 support, integrated Radeon graphics, and Socket AM5 compatibility

  • Product nameRyzen 9 9900X
  • CPU cores12-Core
  • CPU socketSocket AM5
  • Maximum turbo clockUp to 5.6 GHz
  • TDP rating120 W
  • Processor classDesktop
  • 12 cores and 24 threads handle heavy workloads
  • 6 GHz max boost speeds up single-thread tasks
  • 64 MB L3 cache keeps data close to cores
  • DDR5 5600 support feeds memory bandwidth
  • Integrated Radeon graphics output video without a card

Ryzen 9 9900X 12-core desktop processor

The AMD Ryzen 9 9900X is a 12-core, 24-thread desktop CPU built on the Zen 5 architecture. It fits the Socket AM5 platform and operates at a 4.4 GHz base frequency with a maximum boost of 5.6 GHz. Integrated Radeon graphics run at 2200 MHz, providing display output without a discrete card.

DDR5-5600 dual-channel memory support

This processor officially supports DDR5 memory at 5600 MT/s across two channels, with a maximum capacity of 192 GB. The memory controller is a decisive spec; systems requiring higher native speeds or quad-channel bandwidth should verify motherboard capabilities before purchase.

Suited for high-thread workloads on AM5

Content creators and developers who need 12 cores and 24 threads on the current AM5 platform will benefit from the 64 MB L3 cache and unlocked multiplier. Buyers without a compatible cooler or those targeting quad-channel memory platforms should consider alternatives.

How it compares

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

Price $359.99
Pricier than about 80% of the 494 comparable items (median $149.99).
CPU cores 12-Core
Higher than about 60% of the 271 comparable items (median 8).
Maximum turbo clock Up to 5.6 GHz
Higher than about 90% of the 246 comparable items (median 4.7 GHz).

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 9000 Series
Model name100-100000662WOZ
Product nameRyzen 9 9900X
Performance
Working frequency4.4 GHz
Processor
CPU cores12-Core
CPU socketSocket AM5
Maximum turbo clockUp to 5.6 GHz
TDP rating120 W
Processor classDesktop
Processor codenameGranite Ridge
CPU threads24-Threads
L1 cache size768 KB
Level 2 cache12 MB
Level 3 cache64 MB
Process nodeZen 5 TSMC 4 nm FinFET
Max PCIe lanes24/28 (Usable/Total)
Memory
Supported memoryDDR5 5600
Channel configuration2
Memory limit192 GB
Graphics
Built-in graphicsAMD Radeon Graphics
GPU base clock2200 MHz
Ports & slots
PCIe generation5.0
Compatibility
Compatible desktop chipsetsAMD A620 / AMD B650 / AMD B650E / AMD B850 / AMD X670 / AMD X670E / AMD X870 / AMD X870E
Compatible systemsRHEL / Ubuntu / Windows 10 / Windows 11
More details
Advanced technologiesAMD EXPO Technology, AMD Ryzen Technologies

Questions about this item

What does the 5.6 GHz max boost frequency mean for everyday workloads?

The processor can reach 5.6 GHz on demanding single-threaded tasks when thermal and power headroom allow, while the 4.4 GHz base clock is sustained across all 12 cores under continuous load.

How does the DDR5-5600 memory controller limit real-world memory speed?

The integrated controller officially supports DDR5-5600 in dual-channel mode; faster modules will run at this speed unless the motherboard and BIOS enable higher data rates through overclocking profiles.

What cooler mounting and clearance does the AM5 socket require?

The chip uses the standard AM5 socket with a 120 W TDP, so any cooler rated for AM5 and 120 W or higher will mount on the existing back-plate without extra brackets.

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