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JoyBed

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Jun 14, 2019
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Okay so... As I told I got two 7457 cpus rated for 1.267GHz and one 7448 rated for 1,7GHz. As I again already told you the 7448 is planned to go to my DLSD and the two 7457 into the MDD I will go pick up at the end of the week. I already downloaded the PowerLogix & Newertech G4 Enabler to patch the MDD to accept the new 7457s. Any other ideas? Will the enabler work on the MDD?
 

Macbookprodude

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If you get this working on the DLSD, I may pay you to do it. Any real world difference with the 7448 on the PowerBook ?
 
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B S Magnet

macrumors 6502a
Okay so... As I told I got two 7457 cpus rated for 1.267GHz and one 7448 rated for 1,7GHz. As I again already told you the 7448 is planned to go to my DLSD and the two 7457 into the MDD I will go pick up at the end of the week. I already downloaded the PowerLogix & Newertech G4 Enabler to patch the MDD to accept the new 7457s. Any other ideas? Will the enabler work on the MDD?

A 7448 swap of the 7447b, if successful, will be nifty.

I hope you haven’t written off the 4GB project for the DLSD!
 
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Macbookprodude

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I am sure he hasn’t, but to get any G4 to accept over 2GB of memory requires a total re-write to the memory controller which could be impossible.
 
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JoyBed

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Jun 14, 2019
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If you get this working on the DLSD, I may pay you to do it. Any real world difference with the 7448 on the PowerBook ?
Of course, the only problem is the bootrom patch.

A 7448 swap of the 7447b, if successful, will be nifty.

I hope you haven’t written off the 4GB project for the DLSD!
No I havent, but I work on lots of stuff at the same time.
 
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JoyBed

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Jun 14, 2019
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Fathoming a day when a DLSD 17 has been given a 7448 chip swap, the memory controller issue is figured out and 4GB is somehow possible, and running some stable “final-for-PPC” build of Snow Leopard on it, whilst sourcing an LED board and an LED LCD from a dead MBP.

I can dream. I’m allowed.
You know, were not far from your dream days. The DLSDs has been 7448 swapped by daystar, so its just a matter of getting to the bootrom patcher. The PLL configurations and the BGA CPU swap are easy to do for me. The first thing I will try to swap will be the MDD Im going for today. Dual 7457 sweetness 🥰🥰
 
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Macbookprodude

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JoyBed - are you a developer ? Do you want to help me and Cameron Kaiser get Classila to work with the modern web ? I am currently typing this btw, on my PB G4 DLSD.
 
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JoyBed

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Jun 14, 2019
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If you get this working on the DLSD, I may pay you to do it. Any real world difference with the 7448 on the PowerBook ?
I can get those for you. However, I do have a DLSD whuch I am interested in getting the 7448 installed.
If I get the 7457 and 7448 swap done I can offer to do it for someone else on this forum thats not problem. Next week I am swaping the dual 7455 for dual 7457.
 
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bunnspecial

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I wonder if its possible to swap out the 7455 I have in my G4 Titanium with the 7448 ?

I'm going to go out on a limb with this one and say not a chance.

These CPU swaps have some hope of working when there is pin compatibility between the CPUs being swapped. This is true of some 750 CPUs and 7400s/7410s, which is why we have G4 Pismos, Clamshells, and tray-load iMacs. The FW iBook Clamshells, for example, can't be swapped as they are not 7400 pin compatible.

Similarly, the 7447 is pin compatible with the 7448, so as long as the Boot ROM can be made to play with the CPU, it will work. These are a much newer generation CPU than the 7450 series.
 
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ervus

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Apr 3, 2020
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I wonder if its possible to swap out the 7455 I have in my G4 Titanium with the 7448 ?

This is technically possible (I have something similar in a desktop), but it would not be a simple task. The 7457 would be an easier swap. With the 7457 you could get lower power and/or higher speed, larger L2 cache, and still have the backside L3 cache (if your version of TiBook has that?). I think the main hurdle could be patching the firmware to allow the newer chip. I have not seen any info published on how to do that. The easiest chip swap would probably be a newer 7455. This would be a direct swap, mainly with the possibility of lower power and/or higher speed. The last versions of the 7455 were pretty decent, as they could run at 1.6GHz with a lot of power or something like 1.2GHz with pretty modest power.
 
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JoyBed

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Jun 14, 2019
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I wonder if its possible to swap out the 7455 I have in my G4 Titanium with the 7448 ?
Not possible, the thing is that the 745X series are pin compatibe and 744X are pin compatible and swapable. In laptops its not possible, you can however upgrade to 7457. In desktop it is possible because there you change the whole daughterboard and all the daughterboards no matter if 744X or 745X duo or single have the same connector pinout.
 
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Macbookprodude

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If I read correctly, the 7457 didn’t give off much heat compared to the 7455 which is in the 1Gh titanium. I believe it also has L3 cache. I would like to see if the L3 can be reprogrammed to accept 2-4MB L3 though. Whether or not this makes a difference in performance is debatable.

yes, I see that the 7447a/b are pin swappable with the 7448 due to the same series set. I am not sure but I feel my Titanium G4 is faster than the DLSD, probably because the 7447 lack L3 cache, but they also doubled the L2 cache which helps. I know 1.67 and 1.00 is a significant difference in terms of the raw processing power. Maybe the L3 is what’s making the Titanium faster. Again, I can put both side by side (when I get a new PB G4 DLSD).
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This is technically possible (I have something similar in a desktop), but it would not be a simple task. The 7457 would be an easier swap. With the 7457 you could get lower power and/or higher speed, larger L2 cache, and still have the backside L3 cache (if your version of TiBook has that?). I think the main hurdle could be patching the firmware to allow the newer chip. I have not seen any info published on how to do that. The easiest chip swap would probably be a newer 7455. This would be a direct swap, mainly with the possibility of lower power and/or higher speed. The last versions of the 7455 were pretty decent, as they could run at 1.6GHz with a lot of power or something like 1.2GHz with pretty modest power.

hi, the version of Titanium G4 I have is the 1Ghz model - the very last before aluminum PowerBooks - it’s processor is similar to the MDD - it’s a 7455. Yes, like the MDD (I had a dual 1.25 2MB L3 back around 12 years ago) ran very hot. The TI G4 has the same processor.
 
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JoyBed

macrumors regular
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Jun 14, 2019
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Okay, continuing with the swap project. The old non-working PSU has been swapped for a ATX PSU(specs can be seen in the photo) so I have a room for a powerful GPU(I need an advice on that what is the fastest GPU I can cram in there), firmware patched, CPUs swapped with the help of my coworker. Now just to get home to test it out. Later I will overclock it. I plan on something like 190MHz bus and 1,7GHz cpus. The uni-north in my DLSD can handle the189MHz with the 7447 so why not the same series just with the L3? Its the only difference between the 7457 and 7447. Maybe I will replace the L3 cache chips with faster ones to get their clockspeeds higher too and I will check if there are wired lines for the possibility of changing the cache chips to full 4megs the 7457 supports. Also who is willing to pay the price of the cpus and shipping back and forth and something for the time and work I am willing to do the upgrades for anyone who wants it(and if the overclock will be stable and the cache chip upgrade will be possible too I will do that too, also new label with new specs and without the barcode).
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Also if someone have a computer that can accept just the 7455 and not anything higher I can replace it with my 7455 since they are fully functional. (I will also do dual and single swap no matter of the series... 7448 7447 7455 7450 7457 dual single... you name it, I do it)
EDIT: Indeed there are... Our stock 300MHz ones can be replaced with 370MHz ones that are faster and pin compatible and in the datasheet they say they are compatible just faster... Sooo... Im going online shopping for them.
 

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weckart

macrumors 603
Nov 7, 2004
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Okay, continuing with the swap project. The old non-working PSU has been swapped for a ATX PSU(specs can be seen in the photo)

First question, as it's an MDD, is the replacement PSU quieter? Even after changing the Delta fans in the stock PSU it's a fairly (annoyingly) noisy unit.
 
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JoyBed

macrumors regular
Original poster
Jun 14, 2019
208
171
First question, as it's an MDD, is the replacement PSU quieter? Even after changing the Delta fans in the stock PSU it's a fairly (annoyingly) noisy unit.
Yes its quieter, and after replacing the big fan that sools the CPUs it will be even more quiet. probably I will throw some Noctua fans on it to be super quiet and super cool(lowest temps possible). Now im just thinking what voltage to give the 7457 CPUs... If i leave the 1,55V or lower it to something like 1,45V.
 
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JoyBed

macrumors regular
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Jun 14, 2019
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Quick insert: For the safe of the CPUs I lowered the voltage to 1,45V. In about an hour and half I will be at home and testing, than I will report back if it works.
 
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