Performance comparison: which is faster?
Core Ultra 5 135U (Intel, 2024) and Celeron N5105 (Intel, 2021) 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: Ultra 5 135U is about 233.3% faster
Both use the same BGA 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 | Ultra 5 135U | Celeron N5105 |
|---|---|---|
| Performance Score | 15,000 | 4,500 |
| Generation | Core Ultra | Celeron |
| Socket | BGA | BGA |
| Release Year | 2024 | 2021 |
| Type | Laptop | Laptop |
| Compatible GPU Example | GeForce RTX 4060 Laptop GPU | GeForce RTX 4050 Laptop GPU |
| If You Want To... | Recommended |
|---|---|
| Prioritize maximum speed for heavy work or a high-end GPU | Ultra 5 135U |
| Upgrade while reusing the current motherboard | Either works (same BGA socket) |
| Prioritize value and adequate performance | Celeron N5105 (the lower model is often sufficient) |
Ultra 5 135U is about 233.3% higher by score (Ultra 5 135U: 15000 points / Celeron N5105: 4500 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.
Ultra 5 135U is Core Ultra, while Celeron N5105 is Celeron.Both use the same BGA socket, so they can be installed on the same motherboard.
Using our CPU:GPU = 0.9:1 guideline, GeForce RTX 4060 Laptop GPU pairs well with Ultra 5 135U and GeForce RTX 4050 Laptop GPU pairs well with Celeron N5105. If either GPU is too strong or too weak, one part holds the other back.
