Mac Pro 1,1 fan speed maxes out

[badlydrawn]

Dear 1,1 users who upgraded cpu,

my mac pro has been running smooth as butter for 5 days since an upgrade from 2 x5150 to 2 x5365, temps were a little higher, in the ranges between 55C-70C on full stress. However, since yesterday my fan01 and fan02 kicks in at full speed from boot, and I have no control over them (via smcFanControl). Today it was slightly different, it booted up with normal speeds, but since an hour fan01 and fan02 is back at max speed again.

I checked my temp readings, they show a sudden fall in read out, going to -128C just when the fans kicked in to max speed. As you can see from the screengrab, ambient, and the drive bay 1-4 were affected by this drop.

Can anyone suggest a possible problem, and following solution to fix it? I am unsure of what I should look for here.

Fan #0:
    Actual speed : 648
    Minimum speed: 649
    Maximum speed: 2900
    Safe speed   : 1200
    Target speed : 649
    Mode         : auto

Fan #1:
    Actual speed : 2780
    Minimum speed: 641
    Maximum speed: 2900
    Safe speed   : 1200
    Target speed : 2900
    Mode         : auto

Fan #2:
    Actual speed : 1551
    Minimum speed: 639
    Maximum speed: 2900
    Safe speed   : 1200
    Target speed : 1550
    Mode         : auto

Fan #3:
    Actual speed : 598
    Minimum speed: 600
    Maximum speed: 2800
    Safe speed   : 1200
    Target speed : 600
    Mode         : auto

 

[Neodym]

You could check whether the temp sensor cables from the CPU coolers are seated properly. Also - did you do a SMC reset after upgrading the CPU's?

 

[badlydrawn]

Ah thanks no I haven't done an SMC reset. I have tried it now and monitoring the system for the next few days. If the problem persists, I will have to check the temp sensors connections. Is there an online resource where theres a clear layout of the MacPro 1,1 mainboard?

 

[666sheep]

If SMC reset won't cure your problem, you'd have to check Ambient Board cable connector and HDD temp cable connector. They're very close each other (under front fan assembly, very close to upper PCIe power socket) and could be loosen/damaged. Are temp read outs -128 from boot or they're lowering to this amount?
If you need a service manual, feel free to PM me

 

[EvilMonk]

You could check whether the temp sensor cables from the CPU coolers are seated properly. Also - did you do a SMC reset after upgrading the CPU's?

Happened to me when I changed the Dual cores Xeons for Quad cores, its the only things I can think of, Control - Command - P - R at boot and check heatsink connectors are properly connected on the logic board.

 

[mrgossett]

Just swapped mine out last weekend on my 1,1 - same upgrade - 5150s to 5365s. Mine has been running perfectly with no fan or temp problems at all, so far. I have not done the SMC reset, but I did do the Firmware Upgrade from 1,1 to 2,1. I don't know if using the old firmware would affect your fan speed and temps, but here's the upgrade tool if you want to try it. You can also downgrade back to the 1,1 firmware if you decide to:

 

[badlydrawn]

Out of curiosity, what temps are you guys operating under during idle and full load?
My idle temp is 35C-47C core wise with these fan settings:

Total fans in system: 4

Fan #0:
    Actual speed : 915
    Minimum speed: 914
    Maximum speed: 2900
    Safe speed   : 1200
    Target speed : 914
    Mode         : auto

Fan #1:
    Actual speed : 927
    Minimum speed: 929
    Maximum speed: 2900
    Safe speed   : 1200
    Target speed : 929
    Mode         : auto

Fan #2:
    Actual speed : 1013
    Minimum speed: 924
    Maximum speed: 2900
    Safe speed   : 1200
    Target speed : 1014
    Mode         : auto

Fan #3:
    Actual speed : 600
    Minimum speed: 600
    Maximum speed: 2800
    Safe speed   : 1200
    Target speed : 600
    Mode         : auto

and 59C-67C under full load with these fan settings:

Total fans in system: 4

Fan #0:
    Actual speed : 1743
    Minimum speed: 1743
    Maximum speed: 2900
    Safe speed   : 1200
    Target speed : 1743
    Mode         : auto

Fan #1:
    Actual speed : 1658
    Minimum speed: 1658
    Maximum speed: 2900
    Safe speed   : 1200
    Target speed : 1658
    Mode         : auto

Fan #2:
    Actual speed : 1830
    Minimum speed: 1665
    Maximum speed: 2900
    Safe speed   : 1200
    Target speed : 1843
    Mode         : auto

Fan #3:
    Actual speed : 600
    Minimum speed: 600
    Maximum speed: 2800
    Safe speed   : 1200
    Target speed : 600
    Mode         : auto

additionally, smc seems to not be able to control fan03 (psu) at all.

 

[nambuccaheadsau]

Have you checked out the sensor connections as suggested yet? That is the most likely cause of fans revving up to full speed all the time. Roars like a jumbo jet. Have you given the fans a good clean out also?

 

[dkdavis]

similar thing happened to me a couple of weeks ago. Turned out a stick of RAM had gone bad... go figure

 

[badlydrawn]

Have you checked out the sensor connections as suggested yet? That is the most likely cause of fans revving up to full speed all the time. Roars like a jumbo jet. Have you given the fans a good clean out also?

Haven't had a check on the sensors yet, still waiting for a few tools to come in. However, since the SMC reset and firmware update, I have had it go off only once, and a quick sleep and wake-up calmed it down again. Since last three days no anomalies. Still monitoring though.

I have had a good full clean this summer, a few months before the upgrade, so dust isn't an issue.