---------- Original message ---------- Subject: Re: G5 2.7 upgrade to Quad Core? Date: Sonntag 25 Juli 2010N From: Mark Sokolovsky <coolmar...@gmail.com> To: g3-5-list@googlegroups.com
> There is a very slim chance this will work, as it all depends on whether > the processor is compatible, the CPU bus speed, and if the machine will > accept it. I tried putting a dual 500Mhz in my other 400Mhz sawtooth, and > no luck came around. For Power Mac G4s check the UniNorth chip revision. If it is 7 or greater, you can put in a dual processor card, provided it is for the right bus speed or if you modify the multiplier on the processor daughter card. See: http://www.newertech.com/tech_support/uni-north.php > I'm not saying it's impossible, i'm saying I have had too many instances > where something like this failed. The warning is, to not waste money on > something that won't work. try before you buy. Power Mac G5s up to the “Eary 2005” use PowerPC 970 and PowerPC 970FX processors, whereas the “Late 2005” models introduced the Dual-Core PowerPC 970MP. I doubt that system boards for the 970/970FX will handle a Dual-Core CPU at all. Even more, I would be worried if a 970FX CPU will work on a system board made for the original 970 G5 CPU. Also, I couldn't find any source of wisdom that would state how to modify the system bus speed and if a processor card from a different model will fit in any other model that easily. Even more so, the cooling systems on the “Late 2005”s are different to those used in earlier models, so you would have to modify the Quad “Dual-Dual-Core”- CPUs to run on a Dual-2.7 cooling system – or modify the system board and casing of the Dual-2.7 to fit a Quad liquid cooling system. Be aware that the system board of the “Late 2005” is very different to the earlied boards. Prior to the “Late 2005” they used PCI-X and AGP, the ”Late 2005” then introduced PCIe (PCI-Express, not at all compatible with PCI/PCI-X and AGP). The “Late 2005” uses a CPC945 chipset, whereas earlier models use the CPC925 chipset (at least the “Early 2005” does — I'm not sure about the 2003 G5s). It will/would not be so easy to found out if the CPC925 chipset can actually handle a Dual-Core 970MP processor. And still – IMHO – I seriously doubt that earlier system boards will accept a Dual-Core processor. Cheers, Andreas aka Mac User #330250 -- 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
