G5 XServe in G5 Tower?

Discussion in 'PowerPC Macs' started by rbbrchckn, Jul 1, 2013.

  1. rbbrchckn macrumors newbie

    Jul 1, 2013
    Is it possible to put XServe G5 processors in a G5 tower?

    I have a G5 2.7 that needs the water-cooling rebuilt. I was hoping to pull the processors from an XServe 2.3, mount them on 2.0 heat sinks, thermal calibrate with an ASD disk and I assume it will work. I know I will have to keep it in the same G5 "family", but is there ANY reason this won't work?
  2. kbfr08 macrumors 6502

    Mar 16, 2007
    If I remember correctly, the logic board is locked to processors of the same clock speed as the ones that came from the factory. I could be wrong though, it's been a long time since I've worked on a G5
  3. rbbrchckn thread starter macrumors newbie

    Jul 1, 2013
    not locked in- but "family"???

    They aren't necessarily locked in to the processors, you do have to thermal calibrate with the ASD disc, but you can cross processors. I switched the 2.7 from a smushed case into a dual 2.0 with a bad power supply and after calibration it worked for a few years before the water-cooling crapped out. I "think" you have to keep the same family though: the first generation G5 had the 970 v2.2 processor, the next 3 generations had the 970fx; while the last generation had the 970mp processor (also PCI-e slots and 4200 RAM). All G5 XServe's had the 970fx processor so I assume as long as I switch out the heat sink and recalibrate it should work, maybe???
  4. Bug-Creator macrumors 6502


    May 30, 2011
    Well according to this it should atleast work.

    Just have to wait for him to test recalibrating those noisy fans :rolleyes:
  5. Intell macrumors P6


    Jan 24, 2010
    G5 processors aren't all compatiable. All but two logicboards are locked to work with only the same speed CPU. While you can put in a non-compatiable CPU, the bus speed will be greatly reduced as well as the overall clock speed. I don't remember exactly which models, but the two fully compatiable logicboards are a 2.0Ghz and a 2.3Ghz single core model. Those two logicboards could swap CPUs without a problem. But if you put in a different speed other than 2.0Ghz or 2.3Ghz, it'd go into reduced mode.

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