Intel Pentium Extreme Edition 840
 

In the case of multi-tasking, I should say we see less of a performance loss than we would with a standard single core CPU, even one equipped with Hyper-Threading. This can be seen from the last multi-tasking benchmarks that we ran where, even though the 840 was far behind in a dedicated environment, it came out on top in a multi-tasking one.

Direct Link: http://www.mbreview.com/ee840.php