Core i5-661 is a desktop processor from Intel released on 7 January 2010, and it is in end-of-life production status now. It belongs to Core i5 family and has a Clarkdale architecture. This processor is built on Intel Socket 1156, and uses Gen 2, 16 Lanes(CPU only) PCI express connection. 32 nm process is used in production.
Processor has 2 cores and 4 threads, with the base frequency of 3.333 GHz. It has DDR3 Dual-channel memory support. As for the cache, it supports L1 64K (per core), L2 256K (per core) and L3 4MB (shared).