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ill mention a few things 1 your going to need a Firmware Patch for the 7457 to boot 2 I have schematics for all iMac G4s, and on the first gen ones which use 7450 CPUs, there are un-used pads for some L3 cache however I dont know exactly what needs to be populated for those to work, they do...

very nice work! shame the L3 refuses to show up :/  have you seen how far you can clock the stock CPU? the fastest 7450 Apple used was on the 867Mhz quicksilver IIRC but I hear late 800Mhz eMacs can clock up to 1.33Ghz but I cant recall if those had 7450s or 7455s. also interesting on the...

very interesting, which resistors are those exactly on both the 745x based Beige PCI cards and on the MDX upgrades? im guessing the 745x upgrades have regular PLL Resistors as they dont have to worry about auto-ranging since the bus speed is always set to 50Mhz with one of these... I have...

very nice work! im quite interested in how you managed to overclock the sonnet CPU card? generally sonnet CPU cards are not overclockable... (I have a 500Mhz 7410 Sonnet encore ZIF id love to be able to fiddle with multiplier on that especially as in my 83.3Mhz bus G3 beige it sets the...

so im happy report some good new developments in the world of swapping CPUs around  :)   the first one relates to Core voltage of various PPC CPUs, since the start of this whole thing we had been wondering how do we check the Core voltage of various PPC CPUs/Macs when yesterday it hit me, we...

(forgot to mention, the L2 cache in the iBook, according to the L2 Cache chips data-sheet it says it works at both 3.3V and 2.5V, seeing as the L2 cache is working fine with the 7410 im guessing its running at 2.5V in the iBook I guess I could check with a DMM at some point to find out for sure ...

Just wanted to let you guys know that I was able to successfully swap the PPC750L in my iBook G3 clamshell for a 533Mhz 7410 from a DA CPU card :) I made a nice detailed post about it...

interesting :)  id expect that CPU to work in a G3 BW, did you try and drop the FSB down to 66Mhz? (also might be worth running the G4 CPU patch, which stops the G3 BW from complaining about unsupported CPUs)

I remember reading about that on your blog (yay for google translate :) ) but I cant seem to find the article these days which CPU did you try I have noticed theres 2 types of 604 ZIFs one older? black type where you cant see the CPU it self, and a newer type which is a PCB with a 255CBGA...

http://ps-2.kev009.com/rs6000/redbook-cd/sg245144.pdf found this has some interesting info but nothing on the clock multiplier for the CPU sadly I do know when those 604e ZIFs are installed in G3 beiges the CPU speed is still set by the motherboard Jumpers, So I dont think the IBM ZIF CPUs...

indeed I have noticed those 300 pin ZIF 604 CPUs I have been meaning to pick one up to play with but I dont fee like paying £40 for a 20 year old CPU :)  but indeed I too would not be surprised if its just the 60x bus in a socket :)  I want to try one of these 604 ZIF CPUs in one of my BW G3s...

as Dan says the ZIF that comes with G3 BWs is not compatible with a 750CX but in theory you could design a new PCB that takes 750CXs. The PowerLogix 750FX/GX ZIF cards are surprisingly simply theres just the CPU it self and just a few passives on the card, i dont think it would be THAT hard in...

I know the Voltage is set by the CPU ZIF module  :)  (If you read back near the start of this thread you can see me discuss what might be the VID resistors) I have seen a few different designs of ZIFs including some sexy IBM ones with metal capped Cache chips :) but you have a pinout of the...

very cool! thank you for taking the time to reverse engeniner the Pismos Vcore stuff :) my Pismo is still humming along just fine at 2.0V with a Core Clock of 600Mhz :) the CPU Cooler does a surpassingly good job and keeping the overclocked 7410 cool. have you had any luck in reducing the...

this is very Awesome! its cool to see the L2 cache is working, what is the L2 cache voltage on this card? because the 7400 requires a certen pin be pulled high or low etc to set cache voltage, where is the MPC750 just passes it straight through IIRC. so its neat to see L2 works at all. and...

Considering it happens during the Boot screen which is strictly the OpenFirmware frame buffer it looks like indeed something is up with the Graphics chip or related circuitry

im going to guess finding the voltage of the L2 requires googling for the specific chips data sheet? when i get to the CPU card again (likely when i upgrade it to 1GB of RAM) ill make sure to grab a picture of the L2 and to check what voltage it is :) I have other Systems/chips i can check...

I am happy to report some good news in regards to my Pismo that I upgraded the CPU on as I mentioned in my other posts in this thread, while the CPU Swap went well it seemed the L2 cache did not want to work. a few weeks later i decided to give the 7410 a reflow to see if it would fix the L2...

interesting thats some good info there :) when you say 750 are you talking about the MPC/XPC750 or the PPC750L? as the PPC750L by IBM has 1.8v 2.5v and 3.3v cache support. IBM PPC750Ls seem quite popular on 300Mhz and faster G3 upgrades from sonnet etc and in apple PowerBooks/iBooks/iMacs, I...

thats a a very good spot :) (I saw it in the datsheet but never gave it much thought...) must also explain why (aside from core voltage) why my 7410 did not Post properly when soldered onto the 266Mhz ZIF... (iv not checked the L2 cache voltage on that but id not be surprised if its 3.3v as...