guryhwa1121的博客

1,found the test point on pcb so i can read the Vcore.

2,after i had replaced the Celeron 353 with ULV PM 753,i found an unstable problems when raise the FSB to a certain freq.some time at FSB 85Mhz,sometime at FSB 90Mhz,and i found the reason maybe the different Vcore in different version bios.

3,in bios 0401,the Vcore is only 0.6V!and celeron runs at 630Mhz stably and cool,due to low power comsumption,the battery can last for a longer time than other bios;in bios 0511,when the cpu freq. was set to MAX battery,Vcore is 0.69V,when set to MAX power,Vcoore is 0.76V,no matter what profile you set,the Vcore is both undervoltage,because the normal Voltage is 0.812V when CPU runs at FSB100*6,600Mhz or 0.892V at FSB100*12Mhz;the original Celeron 353 doesnot support Enhanced Intel Speedstep Technology ,so the only way to save power is to let cpu run at a slower speed,like FSB 70Mhz.i guess neither released bios supports EIST,so my new PM753 always runs at a low voltage,its not easy for it running at full speed 1.2Ghz unless carry out a mod to raise the Vcore.

4,looking for the Vcore PWM IC ISL6218's PDF!