Ryzen 9 9955HX vs Ryzen 9 9900X

VS

Aggregate performance score

Ryzen 9 9900X
2024
12 cores / 24 threads, 120 Watt
34.18
Ryzen 9 9955HX
2025
16 cores / 32 threads, 55 Watt
36.01
+5.4%

Ryzen 9 9955HX outperforms Ryzen 9 9900X by a small 5% based on our aggregate benchmark results.

Primary details

Comparing processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking130115
Place by popularitynot in top-100not in top-100
Cost-effectiveness evaluation67.73no data
Market segmentDesktop processorLaptop
Seriesno dataAMD Dragon Range (Zen 4, Ryzen 7045)
Power efficiency27.3262.79
DesignerAMDAMD
ManufacturerTSMCno data
Architecture codenameGranite Ridge (2024−2025)Fire Range-HX (Zen 5) (2025)
Release date15 August 2024 (less than a year ago)6 January 2025 (less than a year ago)
Launch price (MSRP)$499no data

Cost-effectiveness evaluation

Performance per price, higher is better.

no data

Performance to price scatter graph

Detailed specifications

Ryzen 9 9900X and Ryzen 9 9955HX basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.

Physical cores12 (Dodeca-Core)16 (Hexadeca-Core)
Threads2432
Base clock speed4.4 GHzno data
Boost clock speed5.6 GHz5.4 GHz
L1 cache80 KB (per core)1.3 MB
L2 cache1 MB (per core)16 MB
L3 cache64 MB (shared)64 MB
Chip lithography4 nmno data
Die size2x 70.6 mm2no data
Maximum core temperature95 °Cno data
Number of transistors16,630 millionno data
64 bit support++
Unlocked multiplier+-

Compatibility

Information on Ryzen 9 9900X and Ryzen 9 9955HX compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.

Number of CPUs in a configuration1no data
SocketAM5no data
Power consumption (TDP)120 Watt55 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Ryzen 9 9900X and Ryzen 9 9955HX. You'll probably need this information if you require some particular technology.

Instruction set extensionsSMT, AES, AVX, AVX2, AVX512, FMA3, MMX (+), SHA, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, SSE4Ano data
AES-NI+-
AVX+-
Precision Boost 2+no data

Virtualization technologies

Virtual machine speed-up technologies supported by Ryzen 9 9900X and Ryzen 9 9955HX are enumerated here.

AMD-V+-

Memory specs

Types, maximum amount and channel quantity of RAM supported by Ryzen 9 9900X and Ryzen 9 9955HX. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR5no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics cardAMD Radeon GraphicsAMD Radeon 610M ( - 2200 MHz)

Peripherals

Specifications and connection of peripherals supported by Ryzen 9 9900X and Ryzen 9 9955HX.

PCIe version5.0no data
PCI Express lanes24no data

Synthetic benchmark performance

Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.


Combined synthetic benchmark score

This is our combined benchmark performance rating.

Ryzen 9 9900X 34.18
Ryzen 9 9955HX 36.01
+5.4%

Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance. Other than that, Passmark measures multi-core performance.

Ryzen 9 9900X 54837
Ryzen 9 9955HX 57771
+5.4%

Geekbench 5.5 Multi-Core

Ryzen 9 9900X 21384
Ryzen 9 9955HX 22114
+3.4%

7-Zip Single

Ryzen 9 9900X 8020
+10.9%
Ryzen 9 9955HX 7230

7-Zip

Ryzen 9 9900X 122724
Ryzen 9 9955HX 143206
+16.7%

CrossMark Overall

Ryzen 9 9900X 2289
+3.2%
Ryzen 9 9955HX 2218

WebXPRT 4 Overall

Ryzen 9 9900X 349
+16.8%
Ryzen 9 9955HX 299

Blender v3.3 Classroom CPU(-)

Ryzen 9 9900X 151
+21.8%
Ryzen 9 9955HX 124

Geekbench 6.4 Multi-Core

Ryzen 9 9900X 20380
+4.1%
Ryzen 9 9955HX 19575

Geekbench 6.4 Single-Core

Ryzen 9 9900X 3429
+6.3%
Ryzen 9 9955HX 3225

Gaming performance

Pros & cons summary


Performance score 34.18 36.01
Integrated graphics card 1.87 2.70
Recency 15 August 2024 6 January 2025
Physical cores 12 16
Threads 24 32
Power consumption (TDP) 120 Watt 55 Watt

Ryzen 9 9955HX has a 5.4% higher aggregate performance score, 44.4% faster integrated GPU, an age advantage of 4 months, 33.3% more physical cores and 33.3% more threads, and 118.2% lower power consumption.

Given the minimal performance differences, no clear winner can be declared between AMD Ryzen 9 9900X and AMD Ryzen 9 9955HX.

Note that Ryzen 9 9900X is a desktop processor while Ryzen 9 9955HX is a notebook one.

Vote for your favorite

Do you think we are right or mistaken in our choice? Vote by clicking "Like" button near your favorite CPU.


AMD Ryzen 9 9900X
Ryzen 9 9900X
AMD Ryzen 9 9955HX
Ryzen 9 9955HX

Other comparisons

We've compiled a selection of CPU comparisons, ranging from closely matched processors to other comparisons that may be of interest.

Community ratings

Here you can see how users rate the processors, as well as rate them yourself.


4.2 432 votes

Rate Ryzen 9 9900X on a scale of 1 to 5:

  • 1
  • 2
  • 3
  • 4
  • 5
4.3 4 votes

Rate Ryzen 9 9955HX on a scale of 1 to 5:

  • 1
  • 2
  • 3
  • 4
  • 5

Comments

Here you can give us your opinion about processors Ryzen 9 9900X and Ryzen 9 9955HX, agree or disagree with our ratings, or report bugs or inaccuracies on the site.