Performance comparison: which is faster?
Ryzen 7 8840HS (AMD, 2024) and Ryzen 5 8645HS (AMD, 2024) are compared here. Compare not only scores, but also whether the motherboard can be reused and which GPU class is balanced with each CPU.
Overall performance: Ryzen 7 8840HS is about 12% faster
Both use the same FP8 socket, so they can be installed on the same motherboard. For games, performance balance with the GPU (guideline CPU:GPU = 0.9:1) matters more than CPU speed alone.
Relative performance score (higher is faster). Actual speed varies by workload, cooling, and memory configuration.
| Item | Ryzen 7 8840HS | Ryzen 5 8645HS |
|---|---|---|
| Performance Score | 28,000 | 25,000 |
| Generation | Ryzen 8000 | Ryzen 8000 |
| Socket | FP8 | FP8 |
| Release Year | 2024 | 2024 |
| Type | Laptop | Laptop |
| Compatible GPU Example | GeForce RTX 4090 Laptop GPU | GeForce RTX 4090 Laptop GPU |
| If You Want To... | Recommended |
|---|---|
| Prioritize maximum speed for heavy work or a high-end GPU | Ryzen 7 8840HS |
| Upgrade while reusing the current motherboard | Either works (same FP8 socket) |
| Prioritize value and adequate performance | Ryzen 5 8645HS (the lower model is often sufficient) |
Ryzen 7 8840HS is about 12% higher by score (Ryzen 7 8840HS: 28000 points / Ryzen 5 8645HS: 25000 points). For gaming, the GPU tier usually matters more than a few percent of CPU difference. For CPU-heavy work such as video editing and streaming, choose the faster CPU.
Both are Ryzen 8000-generation CPUs.Both use the same FP8 socket, so they can be installed on the same motherboard.
Using our CPU:GPU = 0.9:1 guideline, GeForce RTX 4090 Laptop GPU pairs well with Ryzen 7 8840HS and GeForce RTX 4090 Laptop GPU pairs well with Ryzen 5 8645HS. If either GPU is too strong or too weak, one part holds the other back.
