Ryzen 9 9900X vs Ryzen 9 7845HX
Aggregate performance score
Ryzen 9 9900X outperforms Ryzen 9 7845HX by a significant 20% based on our aggregate benchmark results.
Primary details
Comparing Ryzen 9 7845HX and Ryzen 9 9900X processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 157 | 109 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 63.40 |
| Market segment | Laptop | Desktop processor |
| Power efficiency | 49.52 | 27.24 |
| Architecture codename | Dragon Range-HX (Zen 4) (2023−2024) | Granite Ridge (2024) |
| Release date | 4 January 2023 (1 year ago) | 15 August 2024 (less than a year ago) |
| Launch price (MSRP) | no data | $499 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Ryzen 9 7845HX and Ryzen 9 9900X 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 cores | 12 (Dodeca-Core) | 12 (Dodeca-Core) |
| Threads | 24 | 24 |
| Base clock speed | 3 GHz | 4.4 GHz |
| Boost clock speed | 5.2 GHz | 5.6 GHz |
| L1 cache | 64K (per core) | 80 KB (per core) |
| L2 cache | 1 MB (per core) | 1 MB (per core) |
| L3 cache | 64 MB (shared) | 64 MB (shared) |
| Chip lithography | CCD = 5 nm, I/O = 6 nm | 4 nm |
| Die size | 2x 71 mm2 | 2x 70.6 mm2 |
| Maximum core temperature | 100 °C | 95 °C |
| Number of transistors | 13,140 million | 16,630 million |
| 64 bit support | + | + |
| Windows 11 compatibility | + | no data |
| Unlocked multiplier | + | + |
Compatibility
Information on Ryzen 9 7845HX and Ryzen 9 9900X 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 configuration | 1 | 1 |
| Socket | FL1 | AM5 |
| Power consumption (TDP) | 55 Watt | 120 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Ryzen 9 7845HX and Ryzen 9 9900X. You'll probably need this information if you require some particular technology.
| Instruction set extensions | MMX, SSE, SSE2, SSE3, SSSE3, SSE4A, SSE4.1, SSE4.2, AVX, AVX2, AVX-512, BMI2, ABM, FMA, ADX, SMEP, SMAP, SMT, CPB, AES-NI, RDRAND, RDSEED, SHA, SME | SMT, AES, AVX, AVX2, AVX512, FMA3, MMX (+), SHA, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, SSE4A |
| AES-NI | + | + |
| FMA | + | - |
| AVX | + | + |
| Precision Boost 2 | + | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Ryzen 9 7845HX and Ryzen 9 9900X are enumerated here.
| AMD-V | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Ryzen 9 7845HX and Ryzen 9 9900X. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR5 | DDR5 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card Compare | AMD Radeon 610M | AMD Radeon Graphics |
Peripherals
Specifications and connection of peripherals supported by Ryzen 9 7845HX and Ryzen 9 9900X.
| PCIe version | 5.0 | 5.0 |
| PCI Express lanes | 28 | 24 |
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. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.
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.
Geekbench 5.5 Multi-Core
Blender(-)
Geekbench 5.5 Single-Core
7-Zip Single
7-Zip
WebXPRT 3
Pros & cons summary
| Performance score | 28.78 | 34.54 |
| Integrated graphics card | 2.85 | 1.98 |
| Recency | 4 January 2023 | 15 August 2024 |
| Power consumption (TDP) | 55 Watt | 120 Watt |
Ryzen 9 7845HX has 43.9% faster integrated GPU, and 118.2% lower power consumption.
Ryzen 9 9900X, on the other hand, has a 20% higher aggregate performance score, and an age advantage of 1 year.
The Ryzen 9 9900X is our recommended choice as it beats the Ryzen 9 7845HX in performance tests.
Be aware that Ryzen 9 7845HX is a notebook processor while Ryzen 9 9900X is a desktop one.
Should you still have questions on choice between Ryzen 9 7845HX and Ryzen 9 9900X, ask them in Comments section, and we shall answer.
Similar processor comparisons
We picked several similar comparisons of processors in the same market segment and performance relatively close to those reviewed on this page.
