Ryzen 5 8645HS vs Ryzen 7 3800X
Aggregate performance score
Ryzen 7 3800X outperforms Ryzen 5 8645HS by a minimal 1% based on our aggregate benchmark results.
Primary details
Comparing Ryzen 7 3800X and Ryzen 5 8645HS processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 487 | 499 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 15.80 | no data |
| Market segment | Desktop processor | Laptop |
| Series | AMD Ryzen 7 | no data |
| Power efficiency | 13.13 | 30.22 |
| Architecture codename | Matisse (2019−2020) | Hawk Point-HS (Zen 4) (2023−2024) |
| Release date | 7 July 2019 (5 years ago) | 6 December 2023 (less than a year ago) |
| Launch price (MSRP) | $399 | no data |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Ryzen 7 3800X and Ryzen 5 8645HS 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 | 8 (Octa-Core) | 6 (Hexa-Core) |
| Threads | 16 | 12 |
| Base clock speed | 3.9 GHz | 4.3 GHz |
| Boost clock speed | 4.5 GHz | 5 GHz |
| L1 cache | 96K (per core) | 64 KB (per core) |
| L2 cache | 512K (per core) | 1 MB (per core) |
| L3 cache | 32 MB | 16 MB (shared) |
| Chip lithography | 7 nm, 12 nm | 4 nm |
| Die size | no data | 178 mm2 |
| Maximum core temperature | no data | 100 °C |
| Number of transistors | 19,200 million | 25,000 million |
| 64 bit support | + | + |
| Windows 11 compatibility | + | no data |
| Unlocked multiplier | + | - |
Compatibility
Information on Ryzen 7 3800X and Ryzen 5 8645HS 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 (Uniprocessor) | 1 |
| Socket | AM4 | FP8 |
| Power consumption (TDP) | 105 Watt | 45 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Ryzen 7 3800X and Ryzen 5 8645HS. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | Ryzen AI, AES, AVX, AVX2, AVX512, FMA3, MMX (+), SHA, SSE, SSE2, SSE3, SSE4.1, SSE4.2, SSE4A, SSSE3 |
| AES-NI | + | + |
| AVX | + | + |
| Precision Boost 2 | + | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Ryzen 7 3800X and Ryzen 5 8645HS are enumerated here.
| AMD-V | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Ryzen 7 3800X and Ryzen 5 8645HS. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4 Dual-channel | DDR5 |
| Maximum memory size | 128 GB | no data |
| Max memory channels | 2 | no data |
| Maximum memory bandwidth | 51.196 GB/s | no data |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | - | AMD Radeon 760M |
Peripherals
Specifications and connection of peripherals supported by Ryzen 7 3800X and Ryzen 5 8645HS.
| PCIe version | no data | 4.0 |
| PCI Express lanes | no data | 20 |
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.
Pros & cons summary
| Performance score | 14.57 | 14.37 |
| Recency | 7 July 2019 | 6 December 2023 |
| Physical cores | 8 | 6 |
| Threads | 16 | 12 |
| Chip lithography | 7 nm | 4 nm |
| Power consumption (TDP) | 105 Watt | 45 Watt |
Ryzen 7 3800X has a 1.4% higher aggregate performance score, and 33.3% more physical cores and 33.3% more threads.
Ryzen 5 8645HS, on the other hand, has an age advantage of 4 years, a 75% more advanced lithography process, and 133.3% lower power consumption.
Given the minimal performance differences, no clear winner can be declared between Ryzen 7 3800X and Ryzen 5 8645HS.
Note that Ryzen 7 3800X is a desktop processor while Ryzen 5 8645HS is a notebook one.
Should you still have questions on choice between Ryzen 7 3800X and Ryzen 5 8645HS, ask them in Comments section, and we shall answer.
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