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Power Efficiency
- Foxton technology
- Blind replication of Itanium 2 cores at 90 nm would lead to roughly 300 W peak power consumption (Itanium 2 consumes 130 W peak at 130 nm)
- In case of lower than the ceiling power consumption, the voltage is increased leading to higher frequency and performance
- 10% boost for enterprise applications
- Software or OS can also dictate a frequency change if power saving is required
- 100 ms response time for the feedback loop
- Frequency control is achieved by 24 voltage sensors distributed across the chip: the entire chip runs at a single frequency (other than asynchronous L3)
- Clock gating found limited application in Montecito
Foxton Technology
- Embedded microcontroller runs a real-time scheduler to execute various tasks
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