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

MDD 866 Mods

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Protools5LEGuy:
The boards are different. So I decided to take use on my new phone and take some pictures of the R676 on the back side of the motherboard to kill the subject at last.

Protools5LEGuy:
On the CPU Daughtherboard side:

I could find R22, R26 and R27 on the front of the Dual 867, and I couldnt find R22 on the front or back of the Uni 1.25.

I could find R26 and R27 on the back side of the Uni 1.25

Protools5LEGuy:
Just in case someone want to find R22 (maybe is not needed)

Gaz:
Question : I have a working 866 DP , and a broken 1.2 DP, may I swap the Cpu? Can it cause problems with the bus speed? In theory the cpu will be underclocked due to the slower bus clock, other downsides?

Gaz:
Ok the CPU swap worked! Now I have a dual processor @ 1ghz . The slower bus resulted in a underclocked CPU (1Ghz vs 1.25) but for me is now enough, not in the mood to risk damaging the hw overclocking!

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