On Sep 14, 2009, at 9:26 PM, Kris Tilford wrote:
> > On Sep 14, 2009, at 8:10 PM, John Ruschmeyer wrote: > >> Actually, on a beige, you can get exact 400mhz... it's a 6x >> multiplier of the 66mhz bus. > > I have a 400 MHz G4 CPU for my Beige. It ran fine at 400 MHz, and I > was able to overclock it to 433 MHz with zero problems. I ran it at > 466 MHz for several months, but it would freeze about once a week, and > sometimes this would corrupt some data, so I eventually gave up on 466 > and settled for 433. You can go up to a 10x multiplier I think, but I > never saw any ZIFs fast enough to handle that multiplier. I always had success taking a B & W processor 1 step faster in a beige with no problems. ie, a 400 to 433. Once or twice, I was able to get stability at 2 steps (400 to 466) with lots of cooling. But I always had a lot of drives and could never get enough cooling to run that way for too long. Good ol' OWC, still has the beige jumper setting chart up. Here is is: http://eshop.macsales.com/Tech/Load_Page.cfm?page=beigejumpers.html Unless you really want to live on the edge, I would stick with the 66MHz bus and 33MHz pci settings. Some beiges (Rev A Motherboards, iirc) had a chip near the processor called, iirc, the grackle chip that was rated at 83MHz. Looking near the processor, it is a purplish colored chip and if the numbers end in -83 you could POSSIBLY overclock the main system bus to 83MHz. As far as I know, the highest multiplier was 8x, which gives 533MHz at 66MHz bus. OWC was always friendly to overclockers and my guess is that if there was a was to take a 533MHz rated chip to 566 or even 600, they would have shown it, with the usual disclaimers. Len --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
