I wrote the post below in 2006 (it's been edited here for clarity), and have written a number of posts on this subject. So search this group's archives using strings such as "G3 iMac motherboard," "G3 iMac logic board," G3 iMac mobo," or "Jim Scott." The information below is a good skeleton guide. The "divider board" is the perforated aluminum board to which the logic board is attached on the bottom, with the power/analog board on the other side. Swapping divider boards requires almost complete disassembly of a G3 slot-load iMac, including removing the power lead from the CRT -- a dangerous task unless you follow proper safety procedures for discharging any electrical charge.
Good luck! Jim Scott On Sep 11, 2006, at 1:16 PM, Jake wrote: > > Hello, > > I bought my iMac G3 for school, but it has become my main computer. I > would like to swap the motherboard for something a little faster (its > only a 350 without firewire). Can I use any motherboard that was > desiged for an iMac G3?? > > Thanks, > > Jake > Quick answer: no. Longer answer: any 400 or 450 MHz G3 iMac logic board (the Apple term for motherboard) will fit and work perfectly. Some 500 MHz logic boards also will work, IF they have a Motorola cpu. 500-700 MHz logic boards with IBM cpus will not work in an original 350-500 MHz Motorola iMac because the cpu is in a different location on the logic board, and thus will not mate up with the heat sink on the Motorola-based G3 iMac divider boards. Put an IBM 500-700 MHz logic board in a G3 iMac with a heat sink on the divider panel meant for a Motorola cpu, and you'll fry the logic board in a matter of a couple of minutes. Been there, done that. Search this group's archives for extended answers and how-to tips on this subject. Jim Scott On Apr 16, 2009, at 8:05 PM, Po-en Tsai wrote: > > I would also like to know this. Anyone? > > On 4/17/09, Paul <pper...@gmail.com> wrote: >> >> There were several sets of slot loading G3 iMac's. They all had a 100 >> MHz bus, and used the same kind of memory. I have some from at least >> two different sets. Is it possible to move a motherboard from a later >> one into an earlier one? --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to Low End Mac's iMac List, a group for those using G3, G4, G5, and Intel Core iMacs as well as Apple eMacs. The list FAQ is at http://lowendmac.com/imac/list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to imaclist@googlegroups.com To unsubscribe from this group, send email to imaclist-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/imaclist?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
