• Order of the Butterfly
    Order of the Butterfly
    Posts: 358 from 2019/5/9
    From: Central Bohemi...

    Jim wrote:
    Interesting. Do you think you could remove the MPC7447 CPU from a Peg2 G4 board and refit it with an MPC7447A?

    That would guarantee 1.4 GHz operation (or higher).
    I believe they are pin and voltage compatible.

    I don't think so.
    With higher frequencies ( 1.4 GHz and above ) I had memory read errors. From my opinion is northbridge MV64361 responsible for this, not CPU.
    And also remove SMD and sold dip-switch is easy task, if I replace CPUs - there can be much bigger chance to disrupt something.

    Even if I will succeed replace CPUs and northbridge have no errors with MPC7447A - the max frequency is 1.464 GHz - about 10% more than I have today. It is only small surplus with great risk.
    AmigaOS3: Amiga 1200
    AmigaOS4: Micro A1-C, AmigaOne XE, Pegasos II, Sam440ep, Sam440ep-flex, AmigaOneX1000
    MorphOS: Efika 5200b, Pegasos I, Pegasos II, Powerbook G4, Mac Mini, iMac G5, Powermac G5 Quad
  • »31.05.19 - 09:15