Author Topic: Mac Mini G4 Overclock just because its fun.  (Read 10142 times)

Offline domii

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Mac Mini G4 Overclock just because its fun.
« on: February 27, 2022, 03:55:23 PM »
I know this has been covered before in an old thread, but thought I would start a new one as parts where incomplete.
And it is always a struggle to find the multiplier settings when you need them when many of the old sites have disappeared.

So will post what I have and edit this in future if I make any better progress. Feel free to add anything that would help.
And it is fun - 1.8GHz puts out benchmark numbers over 1000 for geekbench, thats MDD territory.
MacOS 9.22 is ridiculously quick.  Will be posting some Unreal Tournament and Quake fps numbers shortly.

On the backside the resistors R355, R351, R358, R362, Essentially removing them all gives you 1.5GHz
Which should be possible on all the models.

R52 - next to cpu under the heatsink. R52 is important as it provides values above 1.58GHz

You can even use a lead pencil or one of those conductive pens to bridge the pins - providing speeds from 1.67 up to 2GHz.
(there is a 1.92GHz setting with evengthing bridged, not sure if anyone has tried that one, but I would like too in near future)

Some things I found on other threads.
1.25 -> (1.42 safe) or 1.5GHz
1.42 -> (1.5GHz safe) or 1.58/1.67GHz, there is even a chap on youtube with a video claiming 2.0GHz with a massive heatsink.

Late model versions
1.3 -> (1.58GHz safe) or 1.67/1.75GHz
1.5 -> (1.67/1.75 safe) or 1.8GHz

* Obviously replace the heatsink pad/paste with something decent when you do the mods to help with the thermals.
* Also a good time to replace the battery and give it a could cleaning/blasting with air.
* And upgrade the hard drive if you havent already to a mSata SSD using one of those adapters.

The main drawback is heat & voltage. I haven't figured out how to adjust the voltage.
It seems the cpu will go to 1.8GHz with the stock blower and Aluminum heatsink. Which is not horrible, they are well designed for the tiny space.

But I would like to go copper as it would most likely provide up to 50% better heat dissipation on something this small.
After which I might give the 1.92 & 2GHz speeds a go.  (which is silly speeds)

Took some measurements and pictures.

Stock aluminum finned heatsink. 40mmx50mmx20mm.
The Cpu pushpin mounts, 35mm spacing between posts. (or 49mm on the diagonal).
60x60x15mm, 12v 2pin blower flan.

I could probably cut/hacksaw a heatsink smaller and drill the holes if needbe, just need to find something suitable out there.
Might replace the blower as well if there is something more silent. Noctua has good stuff but not sure if they have a 60mm blower. There does seem to be various generics on Amazon - not sure if any are better than stock though.

* I know dosdude1 is doing a full on 7447B chip replacement that rocks 2GHz nicely.
* There was a chap that wired dip switches to the resistors and figured out many of the settings on a thread somewhere. Booted his 1.33 mini all the way to 1.92GHz.
« Last Edit: February 27, 2022, 04:38:26 PM by domii »

Offline FBz

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Re: Mac Mini G4 Overclock
« Reply #1 on: February 27, 2022, 04:07:31 PM »
Impressive!

Especially for all you speed demons out there. ;)

Offline teroyk

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Re: Mac Mini G4 Overclock just because its fun.
« Reply #2 on: March 01, 2022, 02:23:04 AM »
I just think: How about underclocking to 1.00 Ghz with big copper heatsink...fanless solution possible?

Offline smilesdavis

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Re: Mac Mini G4 Overclock just because its fun.
« Reply #3 on: August 26, 2022, 10:04:37 PM »
i think even if we need to stick out a heatsink like an old drag car a fanless solution is the only way to go
Looking for: Steinberg Cubase MAC Standard/Score v1-5 & Cubase Audio v1, Cubase Audio v2 for, Cubase Audio v3 for DAE/TDM => complete or in parts

Offline teroyk

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Re: Mac Mini G4 Overclock just because its fun.
« Reply #4 on: September 16, 2022, 06:37:44 AM »
i think even if we need to stick out a heatsink like an old drag car a fanless solution is the only way to go

That was what I thinked too :)
Is there anybody who can test is underclocked fanless solution possible?

Offline indibil

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Re: Mac Mini G4 Overclock just because its fun.
« Reply #5 on: October 15, 2022, 06:44:59 AM »
Hello, I am writing to you from Spain. I have a Mac Mini G4 at 1.42 that I want to use for OS 9.2.2 (Now I write to you from the Classilla browser inside Mac OS 9). I'm searching the internet and I can't find overclock resistor settings for speeds above 1.58GHz. My intention is to reach 1.67GHz, but all the photos on the internet are disappearing. Can someone post a photo of the resistor positions, for speeds greater than 1.58GHz? Thank you.

Offline sonicsky

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Re: Mac Mini G4 Overclock just because its fun.
« Reply #6 on: October 26, 2023, 08:57:58 PM »
hello I'm come from china shenzhen, I find the Power10.2 Model is different from the Power10.1 Model
Power10.2 Model jumper set  R351 R355 R358, is different from this article
https://thehouseofmoth.com/ppc-overclocking-station/#G4mini

Does anyone known all the new jumper set in the  Power10.2 Model?

Offline FBz

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Re: Mac Mini G4 Overclock just because its fun.
« Reply #7 on: October 26, 2023, 10:50:08 PM »

If you have the 1.33 GHz model - House of Moth mentions a fifth resistor that he had yet to locate.

To set the jumpers for 1.33GHz, a 5th resistor has to be located (as it needs to be removed).
With the 5th resistor, for now, permanently enabled, you can only configure for the 4 clock speeds shown above. A common belief is that the 5th resistor is always enabled and acts as a ground but that does not work as the 1.33GHz configuration needs that resistor removed. Comparing a 1.33GHz board with another G4 mini board should help in locating that 5th resistor. Once this is located I will update this page.”
  - House of Moth

You may however wish to review this thread…
http://macos9lives.com/smforum/index.php?topic=4408.0

Offline sonicsky

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Re: Mac Mini G4 Overclock just because its fun.
« Reply #8 on: October 26, 2023, 11:58:15 PM »
So is there any possible to replace the CPU to he hign model 7447A, for example 1.5GHZ and 1.667GHZ and overclock again?
 I bought the two model from ebay

Offline FBz

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Re: Mac Mini G4 Overclock just because its fun.
« Reply #9 on: October 29, 2023, 08:41:33 PM »
@sonicsky Have you removed the heatsink from your PowerMac 10,2? (Actually a 1.33 GHz Mac mini?)


                                                                                                                                               sonicsky's images
If you have the heatsink off, do you see a resistor @ R52?



Better view:

« Last Edit: October 29, 2023, 09:45:57 PM by FBz »

Offline sonicsky

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Re: Mac Mini G4 Overclock just because its fun.
« Reply #10 on: October 29, 2023, 08:56:45 PM »
@FBz, I have not tested the 1.33 GHz Mac mini,
now I decide to change the 1.25GCPU to 1.5GHZ MC7447B HX1500YH QND0645, and set the jmuper to 1.58GHZ first
If the result is ok, and I will change the 1.33 GHz CPU to 1.67GHz MC7447B HX1667ZF QUD0529 and the jmuper to 1.83GHZ last.

I worry the overclock due to cpu power is not enough,  so did i change the adpater to 110W make it normal use?
My aim is to overclock the Mac Mini G4 and Long-term use, thx you give me the graph to compare the jmuper set,
I will take off the heatsink and check the 1.33GHz whether the R52 is different

Offline FBz

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Re: Mac Mini G4 Overclock just because its fun.
« Reply #11 on: October 29, 2023, 09:13:47 PM »
Over 1.5 GHz you probably should increase the CPU voltage ...

You may need to make other changes to the board to increase the power to the CPU - for anything above 1.5 GHz.
What, I do not know.

But maybe 1.67 is possible without changing the CPU to 1.67GHz MC7447B HX1667ZF QUD0529?
OR 1.5GHZ MC7447B HX1500YH QND0645?

You have a 1.25 GHz mini? I thought your pics were of a 1.42 and a 1.33 GHz? ???

Maybe the 1.33 GHz PowerMac 10,2 already has the R52 removed? You will tell us.

The 1.42 GHz PowerMac 10,1 may have the R52 (which may need to be removed?).
                                                        [1.25 GHz Mac minis DO have the R52 in place.]

   

I'd suggest that everyone re-read domil's first post in this thread (at the top) above.
http://macos9lives.com/smforum/index.php/topic,6226.msg46606.html#msg46606

AND Roman78's comments over on this other thread too...
http://macos9lives.com/smforum/index.php/topic,4408.msg31058.html#msg31058
« Last Edit: October 29, 2023, 09:41:12 PM by FBz »

Offline FBz

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1.33 GHz Mac Mini?
« Reply #12 on: November 03, 2023, 09:27:19 PM »
A question for those that may have one of these specific, stock G4 Mac minis.
(Still awaiting a response on this from @sonicsky. So, anyone else with a 1.33?)

     1.33 GHz Mac Mini ONLY

Q: Is there a resistor present at the R52 location (under the heatsink)?

   
       Resistor location red-dotted here on a 1.25 GHz Mac mini.


And if you’ve ever removed (or tried to remove) your G4 Mac mini’s heatsink, you might try this:


                                                          Easier heatsink removal, with a nylon spacer and steel pin from the backside.

Offline sonicsky

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Re: Mac Mini G4 Overclock just because its fun.
« Reply #13 on: November 05, 2023, 07:12:42 PM »
@FBz Yes you are right,  The PowerMac10.2 1.33G Model do not  have the jmpuer,
And I test the change the PowerMac10.1 1.25G CPU to 1.5GHZ MC7447B HX1500YH QND0645,
then overclock it to 1.5GHz, it can not work, I don't konw why? Maybe the CPU is different?

Offline FBz

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Re: Mac Mini G4 Overclock just because its fun.
« Reply #14 on: November 06, 2023, 07:05:37 AM »
@sonicsky / The new CPU does not work? Could you change it back?

Still not certain that your mini was a 1.25 GHz to begin with - as the “backside” resistors matched both 1.42 GHz minis here. (R351 & R358 present.) *Unless someone had already changed your 1.25’s resistors around before.


 A 1.25 here (left side) - and your two are the middle and right examples.

And have not tested this yet, but removal of all four backside resistors from a 1.25 and the 1.42 GHz Mac minis - should yield an overclock of 1.5 GHz. (OR optionally… leaving only R358 in place should net an overclock of 1.58 GHz.) Both instances with the original CPUs and R52 in place.

Thank you for confirming that the 1.33 GHz mini does not have the R52 present.
Overclocking the 1.33 GHz mini will be different than the 1.25 & 1.42 and should not require a CPU swap.



AND if you check the link in the next post below here, you'll note that they found
a similar CPU [to the one that you placed in your 1.25(?)] already in their 1.5 GHz mini.

« Last Edit: November 06, 2023, 08:43:15 AM by FBz »

Offline FBz

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1.5 GHz to 1.83 Mini Overclock
« Reply #15 on: November 06, 2023, 08:23:29 AM »
Thinking about overclocking a 1.5 GHz Mac mini?



Found this obscure gem from one of our Czech “Mac comrades” concerning overclock of 1.5 Ghz Mac mini
to 1.83 GHz. A very intensive resource.

Translated via Google Translate… to English:
https://www-amigaportal-cz.translate.goog/node/156189?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp
(Hope this works for everyone.)

If not... the original (Czech) version: https://www.amigaportal.cz/node/156189

Offline DieHard

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Re: Mac Mini G4 Overclock just because its fun.
« Reply #16 on: November 06, 2023, 08:50:25 AM »
From the article referenced by FBz:

This is what my processor looks like - it's an MPC 7447B, and according to the factory code, it's rated at 1500 MHz.
This is good news because the "B" type was capable of higher frequencies than the "A" type.
Searching the web shows that "B" types are capable of going up to 2 GHz in practice.


Damn, 2 Ghz with a 9200, that's an amazing OS9 rig for it's size :)

Hey FBz,

Is the "A" or "B" just random luck ?  Or is there a pattern for which minis have a "B" series CPU ?

Offline FBz

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Re: Mac Mini G4 Overclock just because its fun.
« Reply #17 on: November 06, 2023, 09:19:51 AM »
Hey FBz,

Is the "A" or "B" just random luck ?  Or is there a pattern for which minis have a "B" series CPU ?

Dunno... without pulling the 1.42 and 1.5's here apart again. I'll check eventually. More homework!

BUT the lowly 1.25 mini that is now open here does have an MC7447B. (I just can't quite make out its' MHz rating - but it isn't 1500 MHz / if that does make a difference.) And I have found no references to successful overclocks noted of 2 GHz. Cooling being the big concern. And if my memory serves me well, I think there was a mention of attaining 1.92 with some stability.

Ahh, Roman78 took a 1.42 to 1.92 http://macos9lives.com/smforum/index.php/topic,4408.msg31132.html#msg31132 but it crashed running XBench. Additional info (also from Roman78, I think) was later posted to Applefritters. Sorry don't have that link handy. ::)

Offline Philgood

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Re: Mac Mini G4 Overclock just because its fun.
« Reply #18 on: December 11, 2023, 11:17:56 AM »
*G4 MDD 1.25GHz (Single 2003)* with 2x 80Gb harddrives, 1Gb RAM, Tascam US-428 and Edirol FA-101 USB/Firewire soundcards-*iMac G3 DV 400MHz* with installs from OS 8.6-OSX Tiger on different harddrives-*Powerbook G4 1.67Ghz* with new SSD ! Love it.

Offline DieHard

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Re: Mac Mini G4 Overclock just because its fun.
« Reply #19 on: December 11, 2023, 12:30:13 PM »
Just read this over at macrumors. Could be interesting.

https://forums.macrumors.com/threads/g4-7448-and-7457-swap.2233532/page-11?post=32783020#post-32783020

Wow, he has stable results for a Mini running 1.92Ghz, we really gotta get this duplicated and documented here if possible