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| Author | TURBO Power Mac 4400/7220 (Read 16783 times) | ||||||||||||||
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Cashed
128 MB  Posts: 192 System 7 Newcomer! 
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on: December 06, 2022, 02:17
Known as one of the road apples. With a tiny intervention, It's possible to bring these up running 240 and 300 MHz. No present overclocking results showed up after a search. TURBO Guide -now on System 7 Today  ps: forgot the image -none of the .hqx archives from that site were captured. lowendmac.com -Additional list of First Generation Power Macs, that can be overclocked. (modern link) |
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Bolkonskij
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Administrator 1024 MB  Posts: 2023
Reply #1 on: December 06, 2022, 09:06
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Very nice, Cashed! Though the TURBO Guide appears to be in Italian? My Italian is a bit rusty ... :-) I think these Macs were coined "Road Apples" at the time when they were relatively new and the "bang for the buck" was worse compared to other Mac models. That said, a Power Mac 4400 still makes a very nice System 7 computer and indeed, if I was on a tight budget, I'd go for these models as they tend to get much less attention on ebay & else. Got little experience overclocking my Macs. But heard of others complaining about stability after the oscillator swaps. And then there's the heat issues - a regular PowerMac 6100 already gets quite warm in that little case, especially with an expansion card in there. I don't know if I'd want to do anything to make it run even hotter? But then like I said, I have no personal experience - looking forward to hear from others who have ? 
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Cashed
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128 MB Posts: 192 System 7 Newcomer!
Reply #2 on: December 06, 2022, 11:09
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Ups sorry about that -hand't noticed my Chrome browser had translated it automatically -head wasn't working yesterday, had the flu symptoms. Exactly my thought too Bolkonskij -I searched the local thrift site right away. As LowEndMac mentions, For the most part, they're not really bad. Second Class Macs & Road Apples Power Mac 4400 and 7220 both links are https Here's the translated Guide: TURBO 4400 Or how to bring the PM 4400 to 240 Mhz The PM 4400, Apple's faithful forklift, can be switched to 240 Mhz. Here's how it is possible to implement the modification that Macity proposes to its readers thanks to the advice of Alessio Murgia and Marco Perici (to whom we say thanks for the precious support) You need to implement the change · A soldering iron, thin tip, 12/15/18 W (even more powerful, for those who are practical but never more than 30W) · A tweezers, ask mom, sister, girlfriend etc. Get the image posted on Macity a few days ago. In case you haven't done it at the time, here is the download link for the 300 DpI image. The image below is 72 Dpi (click for a larger version) WHAT TO DO In the yellow table on the right of the image, the first 4 pairs of numbers indicate the pairs of jumpers to close to obtain the different frequencies, indicated by the last digit; the jumpers instead are those on the left of the "GIF" indicated by the white numbers that we added with Marco. You can also read across the text "CPU Option" in yellow. For example, the card in the photo is at 200MHz; looking closely at the image you can see that the jumpers 1-2/5-6/7-8/10-11 are closed by a resistor, as shown in the table for 200MHz, now to bring the clock of that machine to 240MHZ just move the jumper from 5-6 to 4-5 and the one on 7-8 to 8-9. Close everything, restart, and if you have done everything in a workmanlike manner you will travel at 240 Mhz IMPORTANT NOTE IT IS VERY IMPORTANT not to linger too long with the tip of the soldering iron on the board. In fact, to remove the resistors, just heat them for a few seconds and move them slowly with the tip of the soldering iron, using tweezers to reposition them. Then they must be fixed with a drop of tin The ideal would be to carry out the operation with a practical welder friend. Alessio Murgia assures us that the intervention has been carried out on some Macs that have been operating for some time at 240 Mhz without the slightest problem One last note. According to Alessio, it is also possible to implement a modification that could bring the 4400 to 300 mhz by replacing the oscillator. But that's another story.
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Neal_SE30
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256 MB Posts: 401 System 7 Newcomer!
Reply #3 on: December 06, 2022, 20:29
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Interesting. I believe you can do the same trick on my imac g3ev and up it to 500 or 600mhz. Mine version is 400mhz. I should look into that if it’s that easy. Let me know his you get on
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