Intel Core 2 Quad Processors
Intel has released Intel Core 2 Quad Processors, these are capable of handling 4 threads simultaneously.
Read and experience more at Intel.
http://www.intel.com/products/processor/core2quad/index.htm
http://www.intel.com/products/processor/core2quad/demo/demo.html
All recent processors.
http://www.intel.com/performance/desktop/dighome/index.htm