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  Upping Vcore, CPU Overvolting Explained 
  Mar 06, 2002, 07:30am EST 

Putting it All Together

By: Dan Mepham

So the question then becomes one of the transient state. How long does it take the voltage to reach its intended state (VCC), and how can we reduce the time needed to do so? Part of the time required depends on the design and physical properties of the materials. Thereís really nothing you can do about that, although engineers spend countless hours testing different designs and materials. Fortunately, we can produce the effect of reducing the transient time by increasing the VCC (or rather increasing the difference between VSS and VCC). To illustrate, consider the image below. The red line (VCC+) indicates the new, increased voltage, while the grey VCC indicates the default (proper) voltage for the processor.

Hardware Analysis - Overvolting

When we have VCC+ (or the intended voltage) set to a higher value, it takes less time for our voltage to reach the actual VCC needed by our logic gates. Now, if we decrease the cycle time, our logic highs still come through as logic highs, thanks to the higher core voltage.

Hardware Analysis - Overvolting

Basically, the voltage produces an exponential curve. By increasing VCORE, we're causing the voltage to attempt to reach a higher value in the same amount of time. In hurrying up to the higher value, the voltage reaches our original, desired voltage slightly faster. Unfortunately, we donít have a door example to illustrate this one, so youíll have to take our word for it!

1. Introduction
2. How Your CPU Thinks
3. It's All About Tolerance
4. Transient States
5. Putting it All Together
6. Summary

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