xserve processor in a G4 MDD

I have purchased a dual 1.33 ghz xserve processor from mac-resouces.com & I put it into my Dual 867 MDD (133mhz buss)w/pc2100 ram(768mb or close to that)
It fit right in, but I had to replace the original aluminum heatsink with the copper heatsink
it boots up just fine in X & 9.22 however the problem/question I have is that the system profiler in X(10.3.9) shows the processor as a dual 1.07ghz, not 1.33ghz, the profiler in 9 shows the same thing, as does the apple hardware test CD.
Is this right? Did I NOT get a dual 1.33ghz card?
Any insight woul be great!
Thanks!
Rick

G4 MMD DP867, Mac OS X (10.3.9)

Posted on Apr 6, 2006 5:59 PM

19 replies

Apr 23, 2006 8:25 PM in response to Rick Camburn

Rick,

Have you considered adjusting the ratio?

When I got some of my first upgrade cards it was the bus ratio that was user adjustable and made the processor clock at higher speeds. I just am not sure which ones to pull since the Xserve cards seem to be different (as far as I can tell).

Rick Camburn Author

Level 1

5 points

Apr 24, 2006 2:02 PM in response to Carl Jerris

Hi Carl, I'm not sure I follow you on the "ratio"
If you mean the multipliers on the processor card, yeah, they do seem different than the card shown on the bits and pieces site listed near the top of this thread.
If there is a way to do that, I'm willing to try, its just that that web page seems to have a different card compared to these xserve cards.
All I've been brave enough to do is change the buss speed on the motherboard by pulling the 676 resitor.
Some days the computer would work fine, others it would freeze after 10 minutes of iDvd, so I bumped the buss back to 133mhz by bridging the resitor 676 with a conductive pen, and now it runs @ 1070mhz and freeze & crash free.
If you have any tips, thoughts or questions, feel free to throw them up here.

Thanks & have a great day!
Rick

Apr 24, 2006 2:08 PM in response to Rick Camburn

Hi

It is quite possible that your specific MoBo is just not stable @ 167 MHz. Sometimes changing the core voltage will balance the equation (see bits & pieces), but I cannot say, I've never had to do that mod myself.

Apr 24, 2006 2:40 PM in response to Rick Camburn

Sorry for the confusion Rick. Yes, it is the bus multiplier that I am referring to but was called the bus ratio back in my G3 Powerlogix days.

I was not going to mess with my mobo because as far as I know, the makers of upgrades for mdd's were able to do the mods with bus multipliers. When the card became unstable then switch the dip switches back to a stable multiplier and happy computing. How they got a 133 bus to end up at 1.4gz is truly a feat. Perhaps they were able to adjust the motherboard bus speed from the daughter card???? I just couldn't figure out which resistors were the ones to work with on these xserve cards.

I think that Hussein has the answer to the mobo issue (core voltage) but I'm not willing to mess with my motherboard without a backup to replace it in case of a disaster on my part.

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xserve processor in a G4 MDD