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The SocketA version of the AMD Duron, and the AMD Athlon, are VERY good overclockable. I got my AMD Athlon 500 running at 700 Mhz and my AMD Duron 600 running at ... 900 Mhz !! That is pretty cool for a sub $150 CPU !

Now I know, by the time you read this, it's old news,... but think of this: this trick works most likely for future AMD CPU's as well!!

Take a look at the Duron Tech details for data like temperature etc.

For the Slot-A AMD Druon or Athlon overclocking we used a so called "Gold-Finger" device. A little piece of PCB hooked up to the (hidden) gold-finger connector of the AMD Athlon. Which works great. Take a look at the Athlon overclock page for details.

Overclocking the AMD Athlon or Duron does not require a "Gold-Finger"-device. The trick is cheaper but definitly harder to execute. Or better: it's a more precise excersise.

This does not require any modifications on the mainboard your are use ! You only need a steady hand and patience.

Warning: Overclocking may harm your CPU, hardware and even wreck the data stored on your harddrive, so please read the disclaimer!

AMD Rulezzz

Page Overview

Before we begin ...

I took a good look at several hardware pages like Ace's Hardware page, Anandtech, Tom's Hardware page, Hiroji's Duron900 project and Tweakers.

On all off these pages you will find very valuable tech information on the overclocking subject. Downside is that the information is sometimes incomplete, to hard to do it yourself or simply too technical in general.

This overclocking, does not require any modifications on the mainboard your are using!

Keep in mind though:

  • BIOS: FSB to it's default setting!
    Before you start make sure the FSB (Front Side Bus frequency) setting in your BIOS is set to it's default value !!!!

  • Damage ...
    Overclocking can damage or destroy both mainboard and CPU. All actions are on you own responsibility !!!!

Tip: for revieving your CPU information, use WCPUID, visit the H.Oda homepage for more details.

Just to indicate that it really works, some result:

WCPUID results, and startup screen of the computer: running a Duron600 @ 900 Mhz !


So I bought myself an AMD Duron 600 for about $140 at Korving Computers (Audie: since I mention you here, how about some sponsoring ?). And this what it looks like:

The CPU out of the box ...

A few things we notice on this CPU.

On the right you see a couple of microscopic bridges called L1, L2, L3 and L4.

We also notice the white label. After removing this new bridges are revealed, the L5, L6 and L7.

The CPU after removing the white AMD label

AMD - Overclocking bridges

OK, the pictures I made are maybe not to clear on what I'm refering to, so let's some in for a minute.

I marked the L1, L2, L3 and L4 area as A. The B area marks the L5, L6 and L7.

Highlighted areas A and B

When zooming in to these ares we see the bridges I mentioned (and YES they are very small).

Area A - showing L1, L2, L3 and L4 (rotated 90 degrees counter clock wise).

Bridges L1, L2, L3 and L4

Area B - showing L5, L6 and L7.

Bridges L5, L6 and L7

!! These bridges are the key to overclocking the Athlon/Duron !!

The bridges are used for hardware locking the Duron or an Athlon Socket-A CPU.

An unlocked Duron would have all bridges connected and the BIOS of your mainboard would then have to set Voltage, busspeed and multiplier.

Since most boards do not support this and since autodetection of the CPU settings is a must the Duron is locked. AMD uses a special type of laser to open the bridges if needed.

The names of the bridges and purpose of the bridges are not that important but I'll briefly tell you what we need to do with them.


all need to be closed


- no changes here -


[BP_FID/0V] frequency identifier - we need to changes these


[BP_FID/2V] frequency identifier - we need to changes these


- no changes here -


[FID] frequency identifier - we need to changes these


[VID] voltage settings - we need to changes these too

Let's first create a list of possible settings.

Possible settings - Voltage (L7)

The voltage settings are often changed when overclocking a CPU.

Some mainboards (like the MSI 6330 - K7T Pro) support changing the voltage in the BIOS, other boards don't. To get right to the worse case scenario: let's assume we have a board that doesn't support voltage setting.

In the table below I create an overview (thanks to Thomas pabst). The single dot in these pictures are there for orientation only. Also: the images are orientated, matching the previous zoom-in pictures of the CPU.


Settings L7

1.850 Volt

1.825 Volt

1.800 Volt

1.775 Volt

1.750 Volt

1.725 Volt

1.700 Volt

1.675 Volt

1.650 Volt

1.625 Volt

1.600 Volt

1.575 Volt

1.550 Volt

1.525 Volt

1.500 Volt (default)

As you can see, 1.850 Volt is the max we can get and 1.500 Volt is the default voltage used by a Duron. For overclocking to 900 Mhz my computer works at 1.825 Volts. When doing so, make sure you have to quality cooling ! My cooler actially is pretty good and the cooling fan is running at app. 6600 rpm, which is pretty high.

Possible settings - Frequency Multiplier (L3, L4 and L6)

Next step is to change the multiplier settings. Bridges L3, L4 and L6 are used to do so.
In the table below I create an overview (thanks to Thomas pabst). The single dot in these pictures are there for orientation only. Also: the images are orientated, matching the previous zoom-in pictures of the CPU. The default setting refers to my 600 Mhz Duron.


Settings L6 Settings L3 (0V)

Settings L4 (2V)

1200 Mhz

1150 Mhz

1100 Mhz

1050 Mhz

1000 Mhz

950 Mhz

900 Mhz

850 Mhz

800 Mhz

750 Mhz

700 Mhz

650 Mhz

600 Mhz (default)

550 Mhz

500 Mhz

As you can see, 1200 appears to be the max used by a Duron - don't count on it that you can overclock that far!

I (and several others) tried 900+ Mhz, but it appears that 900 Mhz is the maximum you will get from just changing the multiplier. I still have to do some testing by changing the FSB from 100 Mhz to 100+ Mhz. Since the multiplier seems to run at 9, even a silly additional 5 Mhz could push the Duron to the 1 Ghz barrier ! But, like I said, I still have to test this.

At this moment when I'm writing this article, with the Duron running a performance test (it has been running for 6 straight hours now, playing DivX movies and the temperature remains a steady 41 degrees celcius at 900 Mhz.

The procedure - Step 1: opening bridges

I can tell you this: this is the HARD part !

Before we can start experimenting with settings, we must open all bridges (or at least the onces we want to be open). I have to admit that I didn't do it the safe way: I just opened the settings required for 900 Mhz to strat with.

The bridges are damn small (you might want to get a magnifying glass right now). A medical scalpel does NOT do the job (it took me several attempts to realise this). Finally I used one of the mini drilling machines (like the one from Dremel - as suggested by James D. Flodin on Tom's Hardware page).

Be very very carefull what you are doing ! We do not want the entire contact to be gone !
And believe me: removing the entire contact is done within a microsecond !

So for good experimenting: Open ALL BRIDGES from the L3, L4, L6 and L7.
If your mainboard supports CPU core voltage settings, you do not need to alter L7 (unless you're not sure).
If you decided not to open all bridges (as I did), the check which bridges (Voltage / Multiplier) should be opened.
For example, the 900 Mhz target I used, would require you to open

L3; bridge 4
L4; bridge 3
L6; bridge 4

If you like to set the CPU core voltage as well (I used 1.825 Volt):

L7; bridge 5

The procedure - Step 2: closing bridges

I did not know right away how to close the bridges with an easy removable solution (one might want to return to the CPU's original setting - in case overclocking did not work well).

One solution might be using one of those pen, for fixing PCB's. The pen is capable of drawing electronic conductive lines.

Then I remember a neat trick (thanks Dad!): a simple pencil (I used an regular HB pencil).

The thing with a pencil is that it's easy removable (using alcohol / wet cloth) and on a distance this shot the resistance is minimal. The lead/charcoal mixture in a pencil is electronic conductive enough for our experiments ! So grab a pencil and draw lines over the bridges you want to be closed.

Later, when you have found an ideal setting, you might want to use the conductive pen just to make sure the contacts you create are perfect and lasting (I didn't do that, and it's still working just fine).

Before you start keep in mind that ALL BRIDGES OF L1 must to be connected !
If you forget this, the computer WILL NOT BOOT !

So this is what L1 looks like:

Now set the other bridges, in the way I did it, the bridges look as such:

Voltage - L7
Multiplier - L3
Multiplier - L4
Multiplier - L6


The procedure - Step 3: testing the settings

We now have opened and closed the required bridges for the setting we'd like to test.

Mount the CPU (not using force!) on the Socket-A mainboard.

Next (and don't even THINK of forgetting this !) mount the cooler properly.
This is very important, since the CPU will get too hot otherwise!

Now switch on the monitor, so it will display an image instantly when switching on the computer.

Keep your hand at the power-outlet so you can unplug the powercord when things don't work.

For owners of an MSI motherboard:
take a good look at the D-LED indicators on your board - it's a perfect indicator !

Now, are you ready ? Switch on the computer and see if it boots.

switch off the computer or even better unplug the power-cord.

Possible causes here:
1. bridge contacts are not good enough; try again with the pencil trick.
2. bridge contacts are not set properly; verify the settings for voltage and frequency.
3. CPU core voltage to low; verify the voltage setting and go one step up.
4. CPU core voltage not properly supported by BIOS; don't rely on the BIOS anymore, go for the bridge solution.
5. CPU frequency too high; try a lower frequency.

If it DOES BOOT: Excellent!

Now you should verify the stability of your system.

I did this by simply letting the computer boot Windows and have it playback a DivX movie over and over again.

Before starting the movie however, I started a temperature monitor program that came with the mainboard. If you mainboard does not come with software like that, then download a monitor like MB MONITOR which has great features !

During movie playback I keep the temperature indicator visible. You might, if your software software supports this, set the audiable alert when the CPU reaches a 50 degrees Celcius temperature (the CPU can handle more than just 50 degrees, but I'd rather play on the safe side).

Have the computer running for several hours and see what the temperature does. After a while the temperature stabalizes. If not: you have a cooling problem in your PC !

Also notice: a open PC might not properly indicate the real temperature in comparison to a closed case!



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