> My thinking was that a 7400, which uses more power than a 7410, may still > use about the same amount that an _underclocked_ 7450 will use – in > addition to the thermal issue of possible overheat. > > And the other thinking is, if a Dual-450 will work, then a single 1.4 GHz > (underclocked to 1.2 GHz) should also work. (And if not 1.2 GHz, then at > least 1.0 GHz, or 900 MHz should do the trick…) > > But maybe I'm terribly wrong… and burn my VRM trying it…
Apparently I am wrong. Trying to find how much Watts a specific G4 will pull, I found this quite good yet in some specific points incomplete list (in German): http://www.macinfo.de/hardware/chips.html So apparently the 7400 pulls 5 Watts at 400 MHz and 6 Watts at 500 MHz. So 5.5 Watts at 450 MHz is a good guess. The 7455 pulls 21.3 Watts at 1 GHz. This is four times and thus way too much for an unmodified VRM. Even though neighter a 1.4 GHz 7455 nor a 7455B is explicitly listed, these numbers can't be that far from what my OWC Mercury Extreme G4 (1.4 GHz 7455B processor) should have at 1.0 GHz. And these figures – I'm guessing – are only for the processor, not the complete processor module. Anyway, thanks for your answer. 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 [email protected] For more options, visit this group at http://groups.google.com/group/g3-5-list
