iMac G3 (Rev A -> C) G4 CPU Upgrade

[LightBulbFun]

here is one max1zzz helped me out with when I was also getting started with all this BGA upgrade fun  

https://forums.macrumors.com/threads/diy-g4-cpu-upgrade-round-2-putting-the-power-into-flowerpower.2040272/

 

[SamsungASUS]

Thank you for showing me the post.

 

[cb88]

Shouldn't it be possible to get an NXP [SIZE=18.2px]MC7448THX1267N[/SIZE] to work in there? Note it's a lower power part bin specifically for that use... the 1400-1700mhz parts are higher power even at idle/sleep than this chip.

Looking at the datasheet if using 2.5V IO, the IO pins can tolerate 3.3v maximum, it is specified to run across 33-200Mhz MPX bus speeds. I think it may be nessicary to make an straight through BGA adapter board to disconnect some pins or reconnect some to the ground and power but other than that it seems possible. Or is there something i have missed on my first perusal of the datasheets?

I'm also curious if it would be possible to swap/upgrade the onboard ram.

 

[herd]

Further testing shows that it seems to be rock solid at 1,75V@500MHz now.

Thanks for sharing your results!

I was tinkering a bit with a 7410 in a Pismo and tried it at 1.6v and 500MHz. It was happy with these settings and cool running. I also tried 1.5v, but that was too low for stable operation once it got warm. So one more data point... ymmv.