Performance comparison: which is faster?
Core i9-12900KF (Intel, 2022) and Core Ultra 5 245K (Intel, 2025) 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: i9-12900KF is about 9.2% faster
The sockets differ (LGA1700 / LGA1851), so switching requires a motherboard replacement. 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 | i9-12900KF | Ultra 5 245K |
|---|---|---|
| Performance Score | 41,500 | 38,000 |
| Generation | 12th Gen | Core Ultra |
| Socket | LGA1700 | LGA1851 |
| Release Year | 2022 | 2025 |
| Type | Desktop | Desktop |
| Compatible GPU Example | GeForce RTX 3090 | GeForce RTX 3080 Ti |
| If You Want To... | Recommended |
|---|---|
| Prioritize maximum speed for heavy work or a high-end GPU | i9-12900KF |
| Upgrade while reusing the current motherboard | Choose the CPU matching your motherboard socket |
| Prioritize value and adequate performance | Ultra 5 245K (the lower model is often sufficient) |
i9-12900KF is about 9.2% higher by score (i9-12900KF: 41500 points / Ultra 5 245K: 38000 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.
i9-12900KF is 12th Gen, while Ultra 5 245K is Core Ultra.The sockets differ (LGA1700 / LGA1851), so switching requires a motherboard replacement.
Using our CPU:GPU = 0.9:1 guideline, GeForce RTX 3090 pairs well with i9-12900KF and GeForce RTX 3080 Ti pairs well with Ultra 5 245K. If either GPU is too strong or too weak, one part holds the other back.
