AMD Ryzen 9 9955HX

Desktop CPUAMD

Also called amd ryzen 9 9955hx, ryzen 9 9955hx, 9955hx, ryzen-9-9955hx

AMDDesktop CPUZen 5

AMD Ryzen 9 desktop processor on Zen 5, with 16 cores and 32 threads and 16384 KB L2, 64 MB L3 at 55 W TDP on a 4 nm process addressing up to 96 GB and Yes.

What you need to know

Still a capable Ryzen 9 desktop chip.

AMD Ryzen 9 9955HX launched in January 7, 2025., It has 16 cores and 32 threads on Zen 5, dropping into the FL1 socket. It is no longer the newest SKU in every store, but the chip is still useful when the rest of the PC keeps up.

Still good?: Yes, for most work this class is sold for
Product age: 1 year old
Upgrade pressure: Low

Feex says

Old is not the same as bad. If the GPU is the bottleneck, swapping this CPU is one of the more expensive ways to learn that lesson.

What this hardware means today

Age and usefulness are not the same number. This page keeps them separate.

Performance today: Excellent. Excellent for the class when RAM, storage, and the GPU keep up.
Product age 1 year old: Current generation. Launched January 7, 2025. Newer platforms exist. That does not make this chip unusable by itself.
Support status: Supported. Current Windows and current applications still run on this class of CPU. Platform BIOS support depends on the motherboard or laptop vendor.
Upgrade pressure: Low. Upgrade pressure is low unless you need a different platform feature.

Where does it sit?

Zen 5 sits on AMD's recent Zen desktop and laptop timeline. Later chips keep the brand and change the core.

Zen 2

Zen 3

Zen 4

Zen 5

Performance context

These are qualitative readings, not a fake 8.7 out of 10. Workload still wins.

Gaming: Very Good

Plenty for current games when the GPU is the limit, which it often is.

Productivity: Excellent

16 cores cover office, browser, and compile work in this class.

Multithreaded workloads: Very Good

32 threads. Heavy encodes still scale further on higher-core parts.

General use: Excellent

Everyday Windows use is not where most people notice this SKU first.

Efficiency: Good

Rated 55 W base power. That is a platform number, not a promise about your cooler.

Should you upgrade?

Probably not if this chip already matches your work.

Upgrade makes more sense if

Your workload is strongly CPU limited
You need a newer platform for memory, I/O, or chipset features
You need substantially more multicore performance
You need newer connectivity that your current board cannot offer

Upgrade makes less sense if

The GPU is the real bottleneck
Current applications are already responsive
The CPU rarely limits your workload

Specifications

Figures below follow the Feex Hardware Database record for this SKU. Fields without a recorded value are omitted.

Processor

AMD Ryzen 9 9955HX is built on Zen 5 using a 4 nm process at TSMC.

AMD Ryzen 9 9955HX specifications: Processor
Manufacturer	AMD
Family	Ryzen 9
Architecture	Zen 5
Codename	Fire Range
Generation	Ryzen 9000 Series
Manufacturing process	4 nm
Foundry	TSMC
Segment	Desktop

Cores and threads

AMD Ryzen 9 9955HX has 16 cores and 32 threads.

AMD Ryzen 9 9955HX specifications: Cores and threads
Cores	16
P-cores	16
Threads	32

Clock speeds

Base clock is 2.5 GHz. Boost reaches 5.4 GHz.

AMD Ryzen 9 9955HX specifications: Clock speeds
Base frequency	2.5 GHz
Max boost	5.4 GHz

Cache

Cache on this sheet is 64 MB L3.

AMD Ryzen 9 9955HX specifications: Cache
L2 cache	16384 KB
L3 cache	64 MB
Total cache	80 MB

Memory

AMD Ryzen 9 9955HX addresses 96 GB across 2 memory channels.

AMD Ryzen 9 9955HX specifications: Memory
Supported types	DDR5
Max capacity	96 GB
Channels	2

Package and power

AMD Ryzen 9 9955HX uses the FL1 socket and a 55 W TDP.

AMD Ryzen 9 9955HX specifications: Package and power
Socket	FL1
TDP	55 W
PCIe	Revision 5.0, 28 lanes

Integrated graphics

AMD Ryzen 9 9955HX includes Yes.

AMD Ryzen 9 9955HX specifications: Integrated graphics
Integrated graphics	Yes

Market

AMD Ryzen 9 9955HX launched January 7, 2025.

AMD Ryzen 9 9955HX specifications: Market
Launch date	January 7, 2025
Model	9955HX

Features

AMD Ryzen 9 9955HX records 38 instruction sets on this sheet.

AMD Ryzen 9 9955HX specifications: Features
Instruction sets	AES-NIAVX-512AVX2AVXAVX-VNNIFMASHAVAESx86-64-v464-bit (x86-64)BMI1BMI2CLMULF16CGFNIPCLMULQDQRDRANDRDSEEDSSE4.1SSE4.2x86-64-v3ABMADXCMPXCHG16BFXSRInvariant TSCLZCNTPOPCNTRDTSCPSSESSE2SSE3SSSE3x86-64-v2XSAVEXSAVEOPTMMXMOVBE
Security	AMD SEVAMD SMEExecute Disable (NX)
Virtualization	AMD SVMAMD-V (Hardware Virtualization)NPT / RVIIOMMU
OS capabilities	Docker / Hyper-V readyLinux KVM readyWindows 11 eligibleAndroid emulator readyWSL2 ready

Independent scores

These are PassMark CPU figures. They are not Feex measurements.

AMD Ryzen 9 9955HX specifications: Independent scores
Single-core score	4,385
Multi-core score	55,991
Overall score	15,669
Productivity score	42,533
Creator score	38,688
Engineering score	64,390
Gaming score	27,153
Performance per watt	1,018

Compatibility

Compatibility
Socket	FL1
Board	A shared socket is not automatic compatibility. Check the motherboard CPU list and BIOS revision.
Memory	DDR5, up to 96 GB
Graphics	Yes

A shared socket is not automatic compatibility. Boards often need a BIOS update before a newer chip in the same socket will post.

Cooler clearance, VRM quality, and power limits matter as much as the socket name.

Read the memory list on the board. The CPU can list more standards than one motherboard will accept.

No post after a CPU swap

Clear CMOS only after you confirm the board list includes this SKU and the BIOS is new enough. A supported name on a box is not the same as a flashed board.

Sources and verification

Reviewed by Feex editorial. Last verified August 2026 Status: Partially Verified. How we research.

Feex Hardware Database · Specification source used for this sheet. CC BY 4.0.
PassMark Software · CPU benchmark page for AMD Ryzen 9 9955HX

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