Classic Mac Hardware (Troubleshooting, Upgrading, & Modifying) > Mac CPU Upgrades

1.42 GHz MDD CPU to 867 MHz MDD / swap

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FBz:


Similar story here after resistor removal… except boot-capable.
And this 867 / 1.42 recognizes 1.75 GB under Tiger 10.4.11.
Maybe just a consequence of the process?

Although full 2.0 GB of RAM is installed. (512 MB x 4.)



However OS 9 boots provide the following:



Any “service technician(s)” here? ;)
AHT “red flags” J20 too. :o

Both OS 9 and X “see” the J20, 512 MB RAM as 256 MB.
ALSO, using PC2700U RAM… instead of the noted PC2600U.

And have done the pipe cleaner + alcohol cleaning of slot J20.
Will eventually pull mobo and check all J20’s solder points.
For now, will just leave the J20 slot empty.

Even with the J20 socket empty…
machine boots and runs MUCH faster than before!

refinery:
It's probably a bad stick. OS9 machines will report there is a full 2GB ram installed, it just won't use it. Instead it will always say that finder is using 500+ MB of RAM.

FBz:

--- Quote from: refinery on April 22, 2022, 10:55:19 PM ---It's probably a bad stick.
--- End quote ---

Thanks.
Exactly what I initially suspected.
But further testing with 12 other
(known & tested good) sticks also
provided the same results.

It's either that J20 slot itself - or a
result of that R676 resistor removal?



It recognized the full 2 GB prior
to the removal of that resisitor
and the change from 133 MHz
to 167 MHz FSB. ???

peeperpc:

--- Quote from: FBz on April 23, 2022, 07:14:43 AM ---
It's either that J20 slot itself - or a
result of that R676 resistor removal?



--- End quote ---

My 820-1445-A board also has the resistor removed but still uses the stock 867DP. All 2GB RAM recognized.

FBz:

--- Quote from: peeperpc on April 23, 2022, 01:36:31 PM ---My 820-1445-A board also has the resistor removed but still uses the stock 867DP. All 2GB RAM recognized.
--- End quote ---
Thanks! ;)

Just discovered two more candidates (from storage) for the
1.42 CPU & copper heatsink swap. One’s an 867 DP MDD
and the other… a 1.25 SP MDD.

In that graphic above (funny) but before the resistor removal,
the 1.42 CPU recognized the 2 GB of RAM before the switch
to 167 MHz FSB. I’ll do this other 867 DP next and check it
all again before adding the 1.42 CPU to compare results.

Might be that Mr. Big Fingers damaged that J20 slot?

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