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253668 参数 Datasheet PDF下载

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型号: 253668
PDF下载: 下载PDF文件 查看货源
内容描述: 双核英特尔​​®至强®处理器 [Dual-Core Intel Xeon Processor]
分类和应用:
文件页数/大小: 104 页 / 3687 K
品牌: INTEL [ INTEL ]
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Features  
Note:  
Not all Dual-Core Intel Xeon Processor 5000 series are capable of supporting Enhanced  
Intel SpeedStep Technology. More details on which processor frequencies will support  
this feature will be provided in future releases of the Dual-Core Intel® Xeon® Processor  
5000 Series Specification Update when available.  
Enhanced Intel SpeedStep Technology creates processor performance states (P-states)  
or voltage/frequency operating points. P-states are lower power capability states within  
the Normal state as shown in Figure 7-1. Enhanced Intel SpeedStep Technology  
enables real-time dynamic switching between frequency and voltage points. It alters  
the performance of the processor by changing the bus to core frequency ratio and  
voltage. This allows the processor to run at different core frequencies and voltages to  
best serve the performance and power requirements of the processor and system. The  
Dual-Core Intel Xeon Processor 5000 series have hardware logic that coordinates the  
requested processor voltage between the processor cores. The highest voltage that is  
requested for either of the processor cores is selected for that processor. Note that the  
front side bus is not altered; only the internal core frequency is changed. In order to  
run at reduced power consumption, the voltage is altered in step with the bus ratio.  
The following are key features of Enhanced Intel SpeedStep Technology:  
• Multiple voltage/frequency operating points provide optimal performance at  
reduced power consumption.  
• Voltage/frequency selection is software controlled by writing to processor MSR’s  
(Model Specific Registers), thus eliminating chipset dependency.  
— If the target frequency is higher than the current frequency, VCC is incremented  
in steps (+12.5 mV) by placing a new value on the VID signals and the  
processor shifts to the new frequency. Note that the top frequency for the  
processor can not be exceeded.  
— If the target frequency is lower than the current frequency, the processor shifts  
to the new frequency and VCC is then decremented in steps (-12.5 mV) by  
changing the target VID through the VID signals.  
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Dual-Core Intel® Xeon® Processor 5000 Series Datasheet  
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