On May 23, 2010, at 9:52 AM, Len Gerstel wrote: > > On May 23, 2010, at 11:38 AM, JOHN CARMONNE wrote: > >> >> On May 23, 2010, at 8:18 AM, Mac User #330250 wrote: >>> >>>> John, I don't know anything about cubes, but the CPU modules get their >>>> clock speed by multiplying the bus speed so 133 x 4 = 533. If you use it >>>> with a 100MHz bus then it will operate at 400MHz! >>>> >>>> Will the cube take a dual? I have a spare dual 450MHz. >>> >> >> Where does the Bus speed come from? The logic board or the Daughter card? >> Also i have a 500 cube with a 100 Bus speed >> So your saying that 5x100= 500. What is determining the multipier in my >> Cube 500? I'm getting confused with all the things >> I'm reading, I'd hate to go to all the work to install a processor just to >> find out it's slower that the old one:-) I would think some >> of the AGP cards from the towers would work in a Cube but maybe that's why >> they get so much for the aftermarket ones. >> > > The bus speed is set by the motherboard. The multiplier is set on the > processor card. > > In some systems, there are ways of changing the bus speed, I do not know > about the cube. There are also ways of changing the multiplier on some stock > Apple cards. HOWEVER, both these involve circuit board level soldering and > are not for the feint hearted. > > I am not real familiar with the cube, but because of heat issues, I would not > mess with these. > > IMNSHO, your best bet is to stay with either a genuine Apple processor > designed for the cube, or an aftermarket one designed for it. >
This is all true, but there are some pretty simple hacks to get a little faster processor in the Cube. I'm running mine with a 533mHz CPU from a DA tower, tweaked to run at 600mHz. There is a bank of resistors on the back of the card that sets the multiplier. You can remove resistors with a tweezer and trace new connections with a circuit writer pen. It took me about 10 minutes to tweak my CPU to run at 600, and it's working great. I may try 650mhz at some point, if I get sufficiently bored. Just my $0.02. -Hal -- 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
