Correctly Identifying the PowerMac G4 MDD I Own

Back in the fall as a spare house computer, I picked up a PowerMac G4 MDD Dual 1.42 Tower.   As I do all the upgrading, repair and/or maintenance on our computers this particular PowerMac is throwing me for a loop as far as properly identifying it in knowing the exact model I can draw from in order to obtain the correct parts etc.   It appears that this particular Tower has gone through quite a metamorphosis in its lifetime in that the side outer case label serial number/description indicates that it was originally a Dual 1.0 GHz while the serial number listed in "About This Mac" when referenced here in the Support "Tech Specs" section list it as a MDD Dual 1.25 GHz .   To complicate matters the same "About This Mac" tab as well as within the "System Profiel" itself list my MDD as a "Dual 1.42 GHz Power PC G4 2 MB L3 cache per processor" respectively.   In doing my own research, it would appear that the original Dual 1.0 GHz processor was upgraded at some point to a Dual 1.42 GHz.   This all makes as my G4 MDD Dual 1.42 GHz does not possess a Firewire 800 port and despite having four (4) RAM slots, it appears to max out at 2 GB's.  My conclusion therefore has been to assess that in all other instances other then the processor itself, I still basically have a PowerMac G4 Dual 1.0 GHz and therefore if I should ever need to make repairsand/or acquire additional parts as far as following the correct specs as a guidline I should look only at this model as a reference.   My question is I am correct in this assumption or is there anything additional I should consider or be informed about ?

Sounds like your assumptions are correct, but the ramifications have little limitation with regard to parts, upgrades.....
In the long run, and unless you have a FW800 logic board, the only parts that are different between all the MDD/FW800 machines are the logic boards and Airport/Airport Extreme cards.
All the MDD/FW800 machines can use the same drives, optical and hard, same 2GB max RAM (PC2700 except for the DP 867 MDD, 1.0 FW800), same 4x AGP graphics cards, same PCI cards, same PSU, same power switch board, etc., etc.
Only the logic boards are different within the MDD/FW800 models, and non-FW800 MDDs can only use the Airport 802.11b card, not the Airport Extreme 802.11g card that FW800 boards use.
The installation of the 1.42 processors on the earlier DP 1.0 GHz machine actually made life easier, as the later 1.0 GHz machine had a slower logic board bus and required resistor moves.....

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