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You are here: MacNN Forums > Hardware - Troubleshooting and Discussion > Mac Desktops > Looking to overclock my MDD G4 (from 1.25 to 1.42)...

Looking to overclock my MDD G4 (from 1.25 to 1.42)...
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Location: Santa Clara, CA
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Dec 15, 2003, 04:59 PM
 
I've seen several different pages about the subject but none actually explain in legible English how to do it? In essence, what materials would I need (a soldering iron, etc)? Thanks.
World of Warcraft (Whisperwind - Alliance) <The Eternal Spiral>
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Dec 15, 2003, 06:53 PM
 
god damnit. I jsut closed the window I spent 1/2 hour typing a reply in.

email me, and I'll probably be more likely to reply to you.

****ing hell I hate finals week.
-Kris Olson | 12" PBG4 1.5GHz
     
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Dec 15, 2003, 11:00 PM
 
ok, so, here's what I typed before, or something like that.:

First of all, what you are going to need is a Soldering iron, with a fine tip, and a very, very, very, very, very, very, very, very, very, very, very, very, very, very, very, very, very, very, very, very, very, very, very, very, very, very, very, very, very, very steady hand.

Secondly, you're going to want to have an alternative cooling solution set up. Might I suggest something like found here:

http://homepage.mac.com/paul74/MDDG4CoolingMod.htm

or here:

http://www.verax.de/verax.php?templa...44&amp;lang=en

or (if you want to water cool) here:

http://homepage.mac.com/rgazaway/Wat...rCooledG4.html

With that out of the way, lets start explaining the (over)clocking process, to the best of my knowledge. The processor is "clocked" by a set of resistors on the processor daughtercard. These regulate something, which in turn regulates what the actual processor's frequency is at.

Because you want something in plain english, I assume you are referring to a site like this:

http://homepage.mac.com/paul74/Multipliers.htm

That's actually quite simple to interpret, because on your processor daughtercard, you will see several spaces (or soldered connections) with the following:

PLL_EXT
PLL_0
PLL_1
PLL_2
PLL_3

So, now we can go about interpreting what all the 0's and 1's mean.

On your 1.25GHz processor, you are set up with a solder or resistor bridge on every one of those PLL's, except PLL_3.

If you want to go to, say, 1.42GHz, according to the multiplier table you will need to "open" (read: remove resistor or solder joint) from PLL_1 and PLL_2, and then close PLL_3.

What keeps you from going to , say, 1.587GHz you ask? Well, your ability to cool it. For a processor running that fast, I can guarantee you'll need the water-cooler.

LEt me know if you have any more questions. This is the best I can do without having a processor daughtercard right in front of me.

Good luck!

-Kris
-Kris Olson | 12" PBG4 1.5GHz
     
Jansar  (op)
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Dec 16, 2003, 01:32 PM
 
I appreciate your help on this one. It's been on my mind ever since I got off of school for Christmas break (since I now have time). I'll leep you updated here in the forums as long as I get going on the project. Once again, thank you very much!
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