Re: MDD motherboards
The dual 1.25 will work fine in a single 1.25 motherboard. I don't believe it will harm the motherboard. A number of years ago I did have a dual processor where each processor was running a different speed. An error on my part. It was my first try at overclocking and I somehow skipped part of the directions and only overclocked one processor. I used it for a while before I realized my mistake and overclocked the other processor. On Mar 9, 2:22 pm, David W. Morris bbh...@gmail.com wrote: Thanks for that great reply Wayne! I was beginning to believe that it could not be done. That there was some reason that prevented swapping the single G4 CPU module for use on the dual G4 motherboard. Now, another question is will the dual G4 CPU module work on the single G4 motherboard? As I am trying to trade G4 CPU modules with an owner of a single 1.25GHz G4 MDD PowerMac, it won't be a good trade if he can't use my dual 1.25GHz G4 CPU module. Your idea of changing the clock speed of the unused G4 to its slowest speed (333MHz), is an interesting option and might be less work and trouble. My only concern there is the possibility of messing up my perfectly working motherboard by having two different speeds running on these G4 CPU's. I would be willing to bet no one has tried it before, so no one would know what side effects it might cause. If it is a simple matter of removing, or reconfiguring some resistors on the CPU module to slow down just one of the two G4's, I could try it on the dual 1.25GHz G4 CPU module and keep my dual 1.42GHz G4 CPU model untouched, in case anything went wrong. Anyone else have any comments on this crazy idea? See my original post on this topic for details of what I am trying to do. Thanks David -- 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
Re: MDD motherboards
Hi, 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. Why not just install CHUD, a toolbox for developers? Then you can switch on and off one of the CPUs with a mouse click ... This option has been discussed here and I did it. It works great. When I listen to music, watch a DVD or leave my Mac on at night to download big files I switch it to single CPU mode. When I need all the power I can get, browsing on the net or using Adobe apps, I turn on the second CPU. Works like a charm, de difference in temperature can be up to 16 centigrades. Downgrading a dual MDD would not be very wise IMHO. Regards, Jörg. -- 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
Re: MDD motherboards
Hi, 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. Why not just install CHUD, a toolbox for developers? Then you can switch on and off one of the CPUs with a mouse click ... This option has been discussed here and I did it. It works great. When I listen to music, watch a DVD or leave my Mac on at night to download big files I switch it to single CPU mode. When I need all the power I can get, browsing on the net or using Adobe apps, I turn on the second CPU. Works like a charm, de difference in temperature can be up to 16 centigrades. Downgrading a dual MDD would not be very wise IMHO. Regards, Jörg. -- 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
Re: MDD motherboards
Hi, 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. Why not just install CHUD, a toolbox for developers? Then you can switch on and off one of the CPUs with a mouse click ... This option has been discussed here and I did it. It works great. When I listen to music, watch a DVD or leave my Mac on at night to download big files I switch it to single CPU mode. When I need all the power I can get, browsing on the net or using Adobe apps, I turn on the second CPU. Works like a charm, de difference in temperature can be up to 16 centigrades. Downgrading a dual MDD would not be very wise IMHO. Regards, Jörg. -- 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
Re: MDD motherboards
The reason I suggested this is that he's not going to run MacOS in this machine and the OS he's going to use won't use the second processor at all. CHUD won't work in a non MacOS machine. On Mar 9, 8:17 am, Jörg Duurkoop yaw...@gmail.com wrote: Hi, 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. Why not just install CHUD, a toolbox for developers? Then you can switch on and off one of the CPUs with a mouse click ... This option has been discussed here and I did it. It works great. When I listen to music, watch a DVD or leave my Mac on at night to download big files I switch it to single CPU mode. When I need all the power I can get, browsing on the net or using Adobe apps, I turn on the second CPU. Works like a charm, de difference in temperature can be up to 16 centigrades. Downgrading a dual MDD would not be very wise IMHO. Regards, Jörg. -- 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
Re: MDD motherboards
On Mar 8, 2012, at 11:10 PM, Wayne Stewart wrote: 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 Thanks for that great reply Wayne! I was beginning to believe that it could not be done. That there was some reason that prevented swapping the single G4 CPU module for use on the dual G4 motherboard. Now, another question is will the dual G4 CPU module work on the single G4 motherboard? As I am trying to trade G4 CPU modules with an owner of a single 1.25GHz G4 MDD PowerMac, it won't be a good trade if he can't use my dual 1.25GHz G4 CPU module. Your idea of changing the clock speed of the unused G4 to its slowest speed (333MHz), is an interesting option and might be less work and trouble. My only concern there is the possibility of messing up my perfectly working motherboard by having two different speeds running on these G4 CPU's. I would be willing to bet no one has tried it before, so no one would know what side effects it might cause. If it is a simple matter of removing, or reconfiguring some resistors on the CPU module to slow down just one of the two G4's, I could try it on the dual 1.25GHz G4 CPU module and keep my dual 1.42GHz G4 CPU model untouched, in case anything went wrong. Anyone else have any comments on this crazy idea? See my original post on this topic for details of what I am trying to do. Thanks David -- 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
Re: MDD motherboards
On Mar 9, 2012, at 8:17 AM, Jörg Duurkoop wrote: Hi, 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. Why not just install CHUD, a toolbox for developers? Then you can switch on and off one of the CPUs with a mouse click ... This option has been discussed here and I did it. It works great. When I listen to music, watch a DVD or leave my Mac on at night to download big files I switch it to single CPU mode. When I need all the power I can get, browsing on the net or using Adobe apps, I turn on the second CPU. Works like a charm, de difference in temperature can be up to 16 centigrades. Downgrading a dual MDD would not be very wise IMHO. Regards, Jörg. Your solution would work if I were still going to run MacOSX on this G4 PowerMac MDD system, but I am not. If you had read my original message more closely, you would have seen that I will only be running MorphOS2.7 on this computer from now on. MorphOS2.7 is not SMP capable, so there is no need for the second G4 CPU. The CHUD program you wrote about is for MacOS only, unless it is some kind of Open Firmware program. I could only use it if it can be run from the Open Firmware prompt, before I boot into MorphOS2.7. Thanks for the response anyway. David -- 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
MDD motherboards
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
Re: MDD motherboards
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
