| Processor Family | 1st Generation Intel Core i5 processor |
| Processor Segment | Desktop |
| Processor Number | i5-661 |
| Box CPU part number |
BX80616I5661 |
| OEM Part |
CM80616004794AA |
| Step Code | SLBTB |
| Number of Cores | 2 |
| Number of Threads | 4 |
| Frequency | 3.333 GHz / 3333 MHz |
| L3 Cache | 4 MB |
| Bus Speed | 2.5 GT/s |
| Socket | 1156 |
| Dimensions | 1.48inch x 1.48inch / 3.75cm x 3.75cm |