Oracle's Multi-Core Factor in Licensing 
It is conventional knowledge that in the world of Oracle licensing, one license is needed per processor, but multi-core processors are a different animal. Multi-core processor licensing costs have to do with the number of cores multiplied by Oracle's defined multi-core factor. For example, the IBM AIX (a.k.a. RISC) system has 4-eight core processors, which means that it requires 24 Oracle licenses based on Oracle's "multi-core factor", which is 0.75 for the IBM AIX system.
In this case the formula for determining that 24 Oracle licenses are needed is 4*8*0.75 = 24
The multi-core factor is as follows:
- 0.25 for SUN's UltraSparc T1 processors
- 0.50 for Intel and AMD processors
- 0.75 for SUN's UltraSparc T2 processors
- 0.75 for all other multi-core processors
- 1.00 for single-core processors
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