Performance comparison: which is faster?
Core i5-660 (Intel, 2010) and Core 2 Quad Q9550 (Intel, 2008) 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: i5-660 is about 3.1% faster
The sockets differ (LGA1156 / LGA775), 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 | i5-660 | 2 Quad Q9550 |
|---|---|---|
| Performance Score | 3,300 | 3,200 |
| Generation | 1st Gen | Core 2 |
| Socket | LGA1156 | LGA775 |
| Release Year | 2010 | 2008 |
| Type | Desktop | Desktop |
| Compatible GPU Example | Radeon HD 7850 | GeForce GTX 1030 |
| If You Want To... | Recommended |
|---|---|
| Prioritize maximum speed for heavy work or a high-end GPU | i5-660 |
| Upgrade while reusing the current motherboard | Choose the CPU matching your motherboard socket |
| Prioritize value and adequate performance | 2 Quad Q9550 (the lower model is often sufficient) |
i5-660 is about 3.1% higher by score (i5-660: 3300 points / 2 Quad Q9550: 3200 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.
i5-660 is 1st Gen, while 2 Quad Q9550 is Core 2.The sockets differ (LGA1156 / LGA775), so switching requires a motherboard replacement.
Using our CPU:GPU = 0.9:1 guideline, Radeon HD 7850 pairs well with i5-660 and GeForce GTX 1030 pairs well with 2 Quad Q9550. If either GPU is too strong or too weak, one part holds the other back.
