Classic Mac Hardware (Troubleshooting, Upgrading, & Modifying) > Mac CPU Upgrades
1.42 GHz MDD CPU to 867 MHz MDD / swap
FBz:
Yes, there will be pics when all are done.
Rain day here, so out in the garage cleaning another 867MHz and a 1.25 GHz case for two more 1.42 GHz MDD CPU transplants. Rather than rob side panels from better looking MDDs… used quadruple-aught (that’s four zeroes - 0000) steel wool, lightly sprayed with GOO GONE (goo and adhesive remover) to diminish the look of the now typical gouges, scratches and other time-worn abrasions on the MDD side cases… without reducing the normal sheen / shine of the polycarbonate too much. If you just use the steel wool alone, you end up with a dull matte finish where you’ve attacked the targeted areas.
THEN with Meguiar’s QuikWax sprayed on afterwards, buff that out with a clean terry cloth towel. Might not be perfect - but ’tis much more visually acceptable. (Short of spraying them entirely with clear coat.) Not today.
Once I get these two done, I’ll await simple instructions from MacTron, Knez or others (that maybe a six year-old could follow - because it’s me after all)… about just how to overclock one or more of the 1.42’s.
Then maybe I can rest a bit… after attempting to install six SSDs in a Quicksilver.
(Why IIO, why?) ;)
FBz:
This second MDD 867 MHz DP transition to 1.42 GHz went very well last night.
The R676 resisitor removal was much easier & quicker this time.
Did test a 1.25 GHz DP MDD CPU first and that worked fine… before finally changing to the 1.42.
[So peeperpc, you may have a faulty 1.25 CPU.]
However, the machine would not initially power up with the first PSU installed, even after it had tested functional in it’s previous home. So I swapped out that 360 Watt AcBel PSU for a 400W AcBel and it booted the 1.25. THEN I swapped in the 1.42.
And then… thinking that maybe the 1.42 required a 400W PSU… I checked the first 867 that I’d successfully transitioned and it had a 360W Samsung PSU that booted and continues to run the first 1.42. Seems that I now have some more PSU work to do.
Or maybe Andy Cuffe down in Austin Texas will get some of my PSU work? (I still have another 1.25 GHz MDD to transition to a 1.42 and I’ll need a functioning PSU.)
*No problem with the J20 ram slot in this machine… like the first-transitioned 867 mobo. AND this one has four, 512MB sticks of PC2700 RAM installed
*Above image, after cleaning and polish.
peeperpc:
--- Quote from: FBz on May 27, 2022, 12:28:41 PM ---
This second MDD 867 MHz DP transition to 1.42 GHz went very well last night.
The R676 resisitor removal was much easier & quicker this time.
Did test a 1.25 GHz DP MDD CPU first and that worked fine… before finally changing to the 1.42.
[So peeperpc, you may have a faulty 1.25 CPU.]
--- End quote ---
Does this second MDD 867MHz DP also have 820-1445-A board and is the 1.25MHz DP CPU card 820-1472-A? I just want to be sure.
FBz:
Yes, the 867 MHz DP MDD mobo is an 820-1445-A ©2002
BUT NO… the 1.25 GHz DP MDD CPU is an 820-1452-A ©2002
Not the 820-1472-A CPU that you mentioned.
Getting conflicting results from a search for your 820-1472-A.
Some note it as a 1 GHz DP while others say 1.25 GHz DP. (?)
I’ve another stock 1.25 GHz DP MDD CPU installed and will check
that CPU number next time I have the heatsink off for re-paste.
Other MDD CPUs here:
1 GHz SP 820-1497-A ©2002
1.25 GHz DP also… 820-1497-A ©2002
1.4 GHz DP 820-1470-A ©2002
peeperpc:
--- Quote from: FBz on June 01, 2022, 09:28:04 AM ---Yes, the 867 MHz DP MDD mobo is an 820-1445-A ©2002
BUT NO… the 1.25 GHz DP MDD CPU is an 820-1452-A ©2002
Not the 820-1472-A CPU that you mentioned.
--- End quote ---
Thanks for the info. 820-1452-A is not often seen. I don't know if it can be called a rare item.
--- Quote from: FBz on June 01, 2022, 09:28:04 AM ---Getting conflicting results from a search for your 820-1472-A.
Some note it as a 1 GHz DP while others say 1.25 GHz DP. (?)
--- End quote ---
An 820-1472-A card can be 867MHz DP, 1.0GHz DP, or 1.25GHz DP.
I think the code refers to some kind of board layout version. Since it is not always specific to the speed of the card. For more example, an 820-1470-A can be 1.25GHz DP (FW800 MDD), 1.33GHz DP (Xserve G4), or 1.42GHz DP.
--- Quote from: FBz on June 01, 2022, 09:28:04 AM ---
I’ve another stock 1.25 GHz DP MDD CPU installed and will check
that CPU number next time I have the heatsink off for re-paste.
Other MDD CPUs here:
1 GHz SP 820-1497-A ©2002
1.25 GHz DP also… 820-1497-A ©2002
1.4 GHz DP 820-1470-A ©2002
--- End quote ---
All 820-1497-A cards I've seen are SP. Are you sure this 1.25GHz is DP?
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