Ryzen 7 8840U vs Ryzen 9 9955HX

VS

Aggregate performance score

Ryzen 9 9955HX
2025
16 cores / 32 threads, 55 Watt
36.01
+147%
Ryzen 7 8840U
2023
8 cores / 16 threads, 28 Watt
14.55

Ryzen 9 9955HX outperforms Ryzen 7 8840U by a whopping 147% based on our aggregate benchmark results.

Primary details

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

Place in the ranking115541
Place by popularitynot in top-100not in top-100
Market segmentLaptopLaptop
SeriesAMD Dragon Range (Zen 4, Ryzen 7045)no data
Power efficiency62.7949.84
DesignerAMDAMD
Manufacturerno dataTSMC
Architecture codenameFire Range-HX (Zen 5) (2025)Hawk Point-U (Zen 4) (2023−2025)
Release date6 January 2025 (less than a year ago)6 December 2023 (1 year ago)

Detailed specifications

Ryzen 9 9955HX and Ryzen 7 8840U 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 cores16 (Hexadeca-Core)8 (Octa-Core)
Threads3216
Base clock speedno data3.3 GHz
Boost clock speed5.4 GHz5.1 GHz
L1 cache1.3 MB64 KB (per core)
L2 cache16 MB1 MB (per core)
L3 cache64 MB16 MB (shared)
Chip lithographyno data4 nm
Die sizeno data178 mm2
Maximum core temperatureno data100 °C
Number of transistorsno data25,000 million
64 bit support++

Compatibility

Information on Ryzen 9 9955HX and Ryzen 7 8840U 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 configurationno data1
Socketno dataFP8
Power consumption (TDP)55 Watt28 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Ryzen 9 9955HX and Ryzen 7 8840U. You'll probably need this information if you require some particular technology.

Instruction set extensionsno dataRyzen AI, AES, AVX, AVX2, AVX512, FMA3, MMX (+), SHA, SSE, SSE2, SSE3, SSE4.1, SSE4.2, SSE4A, SSSE3
AES-NI-+
AVX-+
Precision Boost 2no data+

Virtualization technologies

Virtual machine speed-up technologies supported by Ryzen 9 9955HX and Ryzen 7 8840U are enumerated here.

AMD-V-+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Ryzen 9 9955HX and Ryzen 7 8840U. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesno dataDDR5

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics cardAMD Radeon 610M ( - 2200 MHz)AMD Radeon 780M ( - 2700 MHz)

Peripherals

Specifications and connection of peripherals supported by Ryzen 9 9955HX and Ryzen 7 8840U.

PCIe versionno data4.0
PCI Express lanesno data20

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 9955HX 36.01
+147%
Ryzen 7 8840U 14.55

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 9955HX 57771
+147%
Ryzen 7 8840U 23348

Geekbench 5.5 Multi-Core

Ryzen 9 9955HX 22114
+139%
Ryzen 7 8840U 9258

7-Zip Single

Ryzen 9 9955HX 7230
+20.3%
Ryzen 7 8840U 6012

7-Zip

Ryzen 9 9955HX 143206
+149%
Ryzen 7 8840U 57550

CrossMark Overall

Ryzen 9 9955HX 2218
+36.5%
Ryzen 7 8840U 1625

WebXPRT 4 Overall

Ryzen 9 9955HX 299
+24.1%
Ryzen 7 8840U 241

Blender v3.3 Classroom CPU(-)

Ryzen 9 9955HX 124
Ryzen 7 8840U 405
+227%

Geekbench 6.4 Multi-Core

Ryzen 9 9955HX 19575
+88.8%
Ryzen 7 8840U 10366

Geekbench 6.4 Single-Core

Ryzen 9 9955HX 3225
+27.6%
Ryzen 7 8840U 2528

Gaming performance

Pros & cons summary


Performance score 36.01 14.55
Integrated graphics card 2.70 17.10
Recency 6 January 2025 6 December 2023
Physical cores 16 8
Threads 32 16
Power consumption (TDP) 55 Watt 28 Watt

Ryzen 9 9955HX has a 147.5% higher aggregate performance score, an age advantage of 1 year, and 100% more physical cores and 100% more threads.

Ryzen 7 8840U, on the other hand, has 533.3% faster integrated GPU, and 96.4% lower power consumption.

The AMD Ryzen 9 9955HX is our recommended choice as it beats the AMD Ryzen 7 8840U in performance tests.

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AMD Ryzen 9 9955HX
Ryzen 9 9955HX
AMD Ryzen 7 8840U
Ryzen 7 8840U

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Community ratings

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