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AMD

Ryzen 9 9900X3D Spec and Price in the United Kingdom

AM512 cores / 24 threads

Released March 12, 2025 ·

A 12-core sibling to the 9950X3D that keeps the same 128MB of 3D V-Cache-backed L3 in a lighter 120W TDP, at a 5.5GHz boost clock. Losing four cores and 200MHz of peak clock against the flagship X3D barely dents gaming performance, since the cache pool is unchanged, while the lower power draw eases cooling requirements. It suits gamers who also want strong multi-core headroom without the 9950X3D's thermal ceiling.

Tied 17th of 65 models in the CPU catalog on Boost clock — 6 models share this figure. Tied 4th of 65 models in the CPU catalog on L3 cache — 8 models share this figure.

Current best price

No tracked price — this page compares specifications alone.

Specifications

Cores
12
Threads
24
Socket
AM5
Boost clock
5.5 GHz
Base clock
4.4 GHz
L3 cache
128 MB
L2 cache
12 MB
TDP
120 W
Integrated graphics
Yes
Architecture
Zen 5
Process node
TSMC 4nm FinFET
Integrated GPU
AMD Radeon Graphics
Memory support
DDR5-5600
PCIe generation
5
PCIe lanes
24
Unlocked
Yes
Included cooler
No

Guides for this category

How to choose a desktop CPUA chip's socket decides what it can go into; cores, cache and TDP decide what you actually get once it's installed.How many CPU cores you actually needWhy more cores is not more speed, how gaming and productivity ask for cores differently, and why a core count alone never ranks two chips.When a CPU price is actually goodWhy a chip's list price and discount percentage tell you little, what a processor's price does over its life, and how to read its tracked history.Laptop CPU vs desktop CPUA mobile chip with the same core count is not the same processor — what the power envelope changes, and why these parts carry no price.

What owners and reviewers say

Summarised from 2 source(s), reviewed September 14, 2026. A source is counted only where it names this model exactly. How we track prices

Commonly praised

  • Reviewers called it the fastest 12-core gaming chip, beating Intel's Core Ultra 9 285K by a wide margin at 1080p.
  • It pairs that gaming lead with strong productivity results, full overclocking support and AVX-512.
  • Under load it was power efficient, landing near the top of the efficiency charts, particularly in Blender.
  • Owners report it matches the 9800X3D in gaming while adding cores for productivity and streaming.
  • It runs cool under load, with owners reporting roughly 40C idle and around 70C under load.
  • Owners describe an easy drop-in upgrade, including one who used a trade-in program.

Commonly criticised

  • Its $599 price left cheaper X3D parts as better alternatives.
  • Because of AMD's thread targeting it behaves like a six-core X3D chip during gaming.
  • Idle power draw was high relative to Intel's competing chips.
  • It needs BIOS and Windows setup, such as the balanced power plan, to handle core parking and reach full performance.
  • Some owners consider it expensive, particularly against the higher-core 9950X3D.
  • One owner notes it runs a little warmer than expected.

Sources behind this summary

Sources

Every spec above was pulled from one of these — a field a source didn't state was left off rather than estimated.

The MSRP above came from this source instead, tracked separately from the specs.