Currently Being ModeratedNov 20, 2012 12:50 PM (in response to gpsPowerMac)
Hi, my guess is it started life as a Dual 1.0 GHz, (the label), then had the logic board replaced from a Dual 1.25 GHz, (embeded Serial# read in About this Mac), then had the CPUs upgraded to 1.42 GHz, (physical evidence).
Some 1.0s/1.25s were FW/800, some were not...
Currently Being ModeratedNov 21, 2012 2:45 AM (in response to gpsPowerMac)
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.....
Currently Being ModeratedNov 21, 2012 3:07 AM (in response to japamac)
(PC2700 except for the DP 867 MDD, 1.0 FW800)
Then again, PC2700 is backwards compatible with PC2100, so, no need for special RAM between all models.