| Processor Number | i5-661 |
| # of Cores | 2 |
| # of Threads | 4 |
| Clock Speed | 3.33 GHz |
| Max Turbo Frequency | 3.6 GHz |
| Intel® Smart Cache | 4 MB |
| DMI | 2.5 GT/s |
| Instruction Set | 64-bit |
| Instruction Set Extensions | SSE4.2 |
| Embedded Options Available | No |
| Lithography | 32 nm |
| Max TDP | 87 W |
| VID Voltage Range | 0.6500V-1.4000V |
| Processor Graphics ‡ | Intel® HD Graphics |
| Graphics Base Frequency | 900 MHz |
| Intel® Flexible Display Interface (Intel® FDI) | Yes |
| Intel® Clear Video HD Technology | Yes |
| Max CPU Configuration | 1 |
| TCASE | 69.8°C |
| Package Size | 37.5mm x 37.5mm |
| Processing Die Size | 81 mm2 |
| # of Processing Die Transistors | 382 million |
| Graphics and IMC Lithography | 45 nm |
| Graphics and IMC Die Size | 114 mm2 |
| # of Graphics and IMC Die Transistors | 177 million |
| Sockets Supported | FCLGA1156 |
| Intel® Turbo Boost Technology | 1.0 |
| Intel® Hyper-Threading Technology | Yes |
| Intel® Virtualization Technology (VT-x) | Yes |
| Intel® VT-x with Extended Page Tables (EPT) | Yes |
| Intel® 64 | Yes |
| Idle States | Yes |
| Enhanced Intel SpeedStep® Technology | Yes |
| AES New Instructions | Yes |
| Execute Disable Bit | Yes |
