You can easily swap CPU modules between MDDs with the same bus speed. You can also do it between MDDs with different bus speeds but you need to do some resistor mods to get the best results or in some cases to work at all
Taking out a dual 1.25 and replacing it with a single 1.25 is just plug and play Your dual 1.25 will have a 2mb cache while the single will have a 1mb so a dual running on one processor should still be faster than a single. Let me throw a bizarre idea out there that no one else would likely ever want to do. The dual processors clock speeds are individually set. Why not set the unused processors clock speed to the lowest possible speed. I think that would be 333mhz On Mar 6, 8:44 pm, "David W. Morris" <bbh...@gmail.com> wrote: > Since all the smart people hang out on this list, having kept their G3 > to G5 Mac computers, I thought this would be the best place to ask for > help with this question > > I own a dual 1.25GHz G4 PowerMac MDD (FW400, not FW800), that I have > upgraded to a stock Apple dual 1.42GHz G4 CPU module. My question is > this: Since I now have two dual G4 CPU modules (dual 1.25GHz & dual > 1.42GHz G4's), I want to trade my dual 1.25GHz G4 CPU module for a > single 1.25GHz G4 CPU module, to a friend of mine that owns a single > 1.25GHz G4 PowerMac MDD. Then I want to look into the possibility of > over-clocking the single 1.25GHz to 1.33GHz, 1.5GHz, or if possible, > 1.67GHz. > > Are all G4 CPU modules for the G4 PowerMac MDD computers > interchangeable (including single and dual G4 models), or in other > words, are all of the motherboards (except the FW 800 model) the same? > > Here are the reasons for this strange question; > > 1. The G4 PowerMac MDD is a very noisy computer > 2. To make it quieter, the fan must be replaced with a quieter > version, which is going to push less CFM's. > 3. If I am going to use this G4 MDD to run an OS that is not SMP > capable, I don't need the 2nd G4 CPU & one way to reduce heat, would > be to use only one G4 CPU. > 4. The single G4 CPU will be okay with the lower CFM's of the quieter > fan. > 5. Using only one G4 CPU will give me greater flexibility to attempt > over-clocking, while still producing less heat than the dual G4 CPU > modules. > > Since I have many other G4 and G5 Mac computers to run MacOSX and > MacOS9 on, repurposing this one Mac for running only an alternative OS > won't hurt my ability to run MacOSX & MacOS9 whenever I need/want to. > > Thanks to anyone here that might be able to answer this strange > question. -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
