Mac Pro 4,1 RAM

Discussion in 'Mac Pro' started by GP-SE, Feb 27, 2013.

  1. GP-SE macrumors 6502

    Feb 27, 2013
    Hey guys, just got a Mac Pro 4,1
    I added some RAM (3x4GB) for 12GB total, I have a few questions:

    1) I added the RAM to the first 3 slots, leaving slot 4 empty, does this mean I'm running in triple channel?
    2) The RAM I bought doesn't have thermal sensors, does this cause any issues? So far everything seems to be working fine, all fans are running at 600RPM except "Expansion Slots" which is at 800RPM according to istat.
    The RAM temp is reported at 128 for the 3 slots and 129 for the 4th empty slot, although a few other sensors say 129 (CPU B) I have a single CPU system.

    thanks for all the help!
  2. mjsmke macrumors 6502a

    Mar 2, 2010
    Your RAM should be running in triple channel as all 3 modules are the same.

    I dont think the absence of thermal sensors will cause an issue but someone else may be able to help you out more on this one.

    Your fans sound normal. My exhaust, intake, and power supply are 600rpm and expansion slots are 800rpm, Booster (cpu) is 860

    Regarding the temps im having a similar issue with my machine, Also i single cpu mac pro. iStat has my CPU B as 129 and PCI slots as 129. But my Ram is between 30 and 40 C.

    Search for stat 4 on this forum and you will see other temp issues.

    I think when stat can't find a temp it defaults to 129. But im still looking into this.
  3. GP-SE thread starter macrumors 6502

    Feb 27, 2013
    Thanks for the reply, I did a SMC Reset and PRAM reset and nothing changed, so I'm assuming everything is fine. I also think 129 is the default if it gets no reading.

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