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ECS K7S5A Modification (2) The first item I wanted to control was Vcore.
My fastest AMD processor is (officially) an AMD 1.33GHz Thunderbird. I have it
running at 1.6GHz in a modified Abit KT7A. I water cooled it and boosted Vcore
to nearly 2V. I wanted to have the same ability on the K7S5A. To boost the Vcore
provided by the K7S5A, I modified the K7S5A Vcore regulation circuit so that I
can specify Vcore voltages between 1.6-2.0 volts. (I am currently compressing
video with the 1.6GHz so it will probably be another week before I test it in
the K7S5A.) The voltage boost modification is the simplest modification to perform. To do this, I added a resistor between pins 1-7 on the KA7500B chip. The resistor that I used is a Brown/Gray/Orange (18K). Larger resistances decrease the voltage boost. (I tried larger resistors but did not try smaller resistors.) Below are some notes from my Vcore boost experiments: 60K between 1-7 of KA7500B raised min voltage from 1.472 to 1.504. 34K between 1-7 of KA7500B raised min voltage from 1.472 to 1.552. 22K between 1-7 of KA7500B raised min voltage from 1.472 to 1.600. 18K between 1-7 of KA7500B raised min voltage from 1.472 to 1.616. 18K between 1-7 of KA7500B raised max voltage
from 1.856 to 2.00.
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