A Cold Boot Voltage Selector
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1. board Tie an ris Bi zi maaie hs eed one ET On this picture we can see the socket area in more detail Note how I fixed the DIP switch on the printer connector Hope this is not too much Ghetto style 26 03 2002 13 02 3of5 Martin s Voltage Selector Guide http members dingoblue net au roggefam tua voltreport1 html This is a close up of the socket where the vid pins used to be Now the same on the back side of the board First an overview picture J ust look at those magnificent connections going from the BX northbridge to everything else The socket area 4of5 26 03 2002 13 02 Martin s Voltage Selector Guide http members dingoblue net au roggefam tua voltreport1 html qe Parte ee a Fh 1 NOSIS Re Ach So this is the end If this isn t nuts don t know what is Martin lt Coppermine Lapping Socket Modding for Tualatin 5 of 5 26 03 2002 13 022. Martin s Voltage Selector Guide lof 5 http members dingoblue net au roggefam tua voltreport1 html A Cold Boot Voltage Selector This mod is something had considered for a long time but had never done it due to the perceived difficulty of insulating the CPU pins from the motherboard But with the Tualatin mod developed a method of doing just that So finally a cold boot voltage selector came within reach Read on The Reasons Given the board has the option within the BIOS setup to select the cpu voltage why would anyone implement a manual voltage selector Well there are a few good reasons For starters the CPU always Starts with its default voltage upon cold boot So you can never overclock to a clock speed that requires a higher voltage right from the beginning This is the major gripe have with the Asus CUBX The only other one is the limited number of FSB options but that one is less critical It is also more practical during experiments since otherwise the BIOS must complete a boot sequence before a changed voltage setting becomes active A very annoying quirk of the CUBX One way to overcome the cold boot issue is vid pin modding However this will only give you limited options since you can only pull signals down to logical zero you cannot lift them up without physical destruction The vid pin modding may also lead to mechanical issues depending on the method used Either the CPU is not sitting flat on the socket o
3. of signals Insulating 26 03 2002 13 02 Martin s Voltage Selector Guide http members dingoblue net au roggefam tua voltreport1 html the CPU pins is done by taking the top off the socket and removing the corresponding connectors inside To that end we bend them back and forth until they break off We then connect the socket pins from underneath to a DIP switch according to this diagram Vido Vid1 Vid2 Vid3 Vid4 Vss DIP switch Note that pin 6 can be connected to just any GND pin on the board The corresponding DIP switch 6 must always be switched on to keep the back plane on GND level We can then select the Vid pins we want to pull down to GND The other pins are left floating which is interpreted as logical one by the input gates The following chart contains a reference of relevant voltages voltages above 2 1V are omitted Voltage Identification Definition VID S E FEF only NOTES 1 00 Prosesseor pin connmeched bo Ves 2 17 Operon processor may be pulled upto TTL Viy on motherboard 3 The Celeron processor core utes 02 0 V power source 4 VIDE applies only to the 5 E P Package YDET applies to both S E F and PGA packages The Action First prepared the Selector using a row of DIP switches and part of an old floppy cable View from the top 2 of 5 26 03 2002 13 02 http members dingoblue net au roggefam tua voltreport1 html Martin s Voltage Selector Guide And from the bottom This is top of the
4. r pins are in danger of getting bent or you might short CPU pins Also it is cumbersome to make changes And changes might be required because the BIOS setup only allows to raise the default voltage not to lower it So you cannot hardwire a high voltage to be on the safe side for your experiments and choose to lower it to the required level in the BIOS Btw still think the Asus CUBX Is one of the best BX boards just made it better Similar restrictions apply to other boards and this mod could be done on most other boards in just the same way On Slot 1 boards there is usually no need since you can always use a slotkey and a socket CPU Most slotkeys provide a voltage selection on board The Plan So what is the way out of this We simply drop the premise about not allowing physical destruction and replace the signals provided by the CPU with our own signals Let s have a look at the pinout of the Coppermine CPU O C QO AN TROY DRO BRO ADS TRST Tol TEO D D a AM TES YOC TaS YOC TSS FID Oo 5 O i i AL FIIT DESY THRMON THRMOF TCE Woo Wile rm E AK FWRGO RS RESY TMS Yoru Was C C D cl C Pa AJ YOG Yas Yoo ESEL ESELI Eai Wo D Oo oO ry AH Rad THERM SLP YEG VES Wot ea D kA AG BA INIT STPCL HOMNE ai i tS AF WSS Yoo Ves O AE Pwr IERF FLUSH ry A rm Note that the pin AK36 is connected as Vid4 on the CUBX Now all that needs to be done is to insulate the CPU pins marked red from the socket and to feed in a separate set
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