Oracle
The Oracle Processor Core Factor has nothing to do with discounts. It has to do with how many licenses are required for a particular processor.
The quad-core SPARC64 is the SPARC64-VII, not the SPARC64-VII+. SPARC64-VII is rated at 0.75 per core (three Oracle licenses per quad-core chip). For an IBM POWER6, two licenses per chip are required (two cores, 1.0 licenses per core).
Originally, Oracle's rule was based on the fact early dual-core RISC chips were about 1.5 times as powerful as the single-core chips which preceded them (hence a 0.75 multiplier), and the first dual-core x86 chips had a much slower clock rate and had a performance on par with the fastest single-core x86 chips (hence a 0.5 multiplier).
The UltraSPARC T1 0.25 multiplier was basically a gift from Oracle to promote the T1 platform. A 0.5 multiplier was more accurate based on performance. Likewise, the 0.5 multiplier for Itanium was a gift to HP. Why Oracle has not rescinded it like the UltraSPARC T is beyond me. Oracle has tripled the licenses required on the UltraSPARC T with three iterations of the chip, and Oracle has only increased IBM POWER licenses by 33% over the course of three iterations, and maintains Itanium at a significant license discount compared to SPARC64 and POWER.
For some reason, Oracle only requires 0.75 licenses on the SPARC64-V single-core processor, the only single-core processor which gets that reduced license.
It doesn't have to make sense. It's Larry.