FIC PA-2007 Voltage Adapter
 
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Graham Technologies
 
What is an FIC PA-2007 voltage adapter?
How does the voltage adapter work?
How do you build the voltage adapter?
Notes & Credits & BIOS recognition
 
What is a PA-2007 voltage adapter?
First of all, the FIC PA-2007 is a motherboard that is still very popular.  Until recently when good socket 7 motherboards with AGP became available, the PA-2007 and Shuttle HOT-603 were the best motherboards you could buy.  (Which one you got depended on which minor differences you prefered.)  Anyway, the PA-2007 supported all of the socket 7 CPUs available at the time of its release, and makes a pretty good attempt at supporting CPUs later available.  And its to this end that many PA-2007 owners are interested in a voltage adapter.  The problem is that the PA-2007 doesn't support the voltage officially required for using it with .25 micron AMD CPUs like the K6-266.  The K6-266 officially requires 2.2v, but the closest setting the has PA-2007 is 2.1v.  Although there have been many reports of the K6-266 running fine at 66x4=266MHz at 2.0v, the lack of voltage practically eliminates any chance of overclocking it.  So how can PA-2007 owners drop a K6-266 in and overclock to something like 75x4.5=337.5MHz?  They build voltage adapters!
 
How does the voltage adapter work?
The voltage regulator on most motherboards, including the PA-2007, determines how much voltage to pump into your CPU by the value of the resistors next to the voltage jumpers.  When you jumper for a voltage setting, you're actually completing a circuit for telling the voltage regulator the resistor value.  Below are the values for this on the PA-2007
Resistor # 
Value
Voltage
Jumper
R268 61.9k ohms 3.52v VRE
1-2
R269 75.0k ohms 3.28v STD
3-4
R272 90.0k ohms 3.2v
5-6
R274 158k ohms 2.9v
7-8
R277 210k ohms 2.8v
9-10
R701 82.5k ohms 2.1v
11-12
This information is available thanks to FIC Technical Support.
 
How do you build the voltage adapter?
It's probably easier than you think.  How does just putting another jumper on sound?  Well jumpering both jumpers 11-12 and 9-10 will result in a combined resistor value that results in voltage of 2.3v; a little over spec. but great for overclocking.  Need even more voltage for those major overclocks?  Jumpering both 11-12 and 7-8 results in voltage of 2.4v.  Now, if you thinking, "Hey, what if I want the official voltage of 2.2v?", don't fret.  It can be done, but takes a little more work.  It involves real building with splicing, purchasing a few parts, and maybe even a little soldering.  (Before you freak, that soldering iron won't come anywhere near your precious PA-2007.) 
Jumpers
New & Old Jumpers
First you're going to have to find a jumper with leads comming off it to replace the regular jumper.  The regular jumper just connects the two leads on the motherboard, where as the new jumper will allow you to put an additional resistor in between.  If your case came with a turbo button, it probably has exactly what you need to do this.  However, you'll have to cut off the jumper and strip the insulation from the end of the wire to make leads.  This will of course ruin your turbo button.  If you attach a 47k ohm resistor inbetween, you'll barely get 2.2v, but a 100k ohm resistor will get you a nice and stable 2.25v. Turbo Button 
Turbo Button from my
PCP&C AT/ATX Mid-Tower
Complete list of how to get voltages between 2.1v and 3.3v in 0.1v increments:
Approx. Voltage
Exact Voltage
Jumper Setting Used
2.1v 2.123v 11-12
2.2v 2.196v 11-12 w/ 47k ohm Resistor
2.2v 2.251v 11-12 w/ 100k ohm Resistor
2.3v 2.340v 11-12 & 9-10
2.4v 2.414v 11-12 & 7-8
2.5v 2.501v 11-12 & 9-10 & 100k ohm Resistor
2.6v 2.625v 11-12 & 5-6
2.7v 2.735v 11-12 & 3-4
2.8v 2.791v 9-10
2.9v 2.899v 7-8
3.0v 3.072v 11-12 & 9-10 & 5-6 & 100k ohm Resistor
3.1v 3.134v 11-12 & 9-10 & 5-6
3.2v 3.205v 5-6
3.3v 3.301v 3-4
This information is available thanks to Antonia Cataldo (DownUnder Geek).
 
Notes & Credits & BIOS Recognition
Notes:  I take absolutely no responsibility for anything unfavorable that happens because of something you do from reading this.  If you damage your motherboard by using unsupported methods, it's your own fault.  Please read the disclaimer.  If you're wondering why I bothered to make a page for the PA-2007 and no other motherboard, it's because I own a PA-2007
Credits:  I would like to thank whoever it was that told me that resistors could be used to get otherwise unavalable voltages on a motherboard (originally for getting 4.0v since 3.5v is the ceiling on most motherboards), Antonio Cataldo for doing all of the testing necessary for the information he provided and letting me post it here (visit his site, the PA-2007 Technical Reference), and finally I'd like to thank FIC for making kick-ass motherboards and excellent support.  FIC is working on a BIOS update for K6-266 and K6-300 recognition.  You can download a beta of it here: 113cd15.  It works with both the 586A and 586B south bridge, adds K6-266 and K6-300 recognition (with the 66MHz bus), corrects the problems with the low memory write speed, and increases performance by about 5% over 109cd12.  Be aware however that you should know what you're doing when flashing your BIOS, and I am in no way responsible for any damage or inconvenience caused if you flash your BIOS to 113cd15.
 
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