Oracle Licensing

Good One.
Processor/CPU licensing You pay per processor (CPU) you run the Oracle software on. Intel Hyperthreading technology that makes one core look like two counts as 2 processors for this purpose (see this document)
Multi-core processors are priced as (number of cores)*(multi-core factor) processors, where the multi-core factor is:
0.25 for SUN's UltraSparc T1 processors 0.50 for Intel and AMD processors 0.75 for all other multi-core processors 1.00 for single-core processors .....................................read more below
http://www.orafaq.com/wiki/Oracle_Licensing#Processor.2FCPU_licensing
http://www.itmanagementresource.com/how-oracle-licensing-differs