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Fan Speed After 4,1 to 5,1 Firmware Upgrade

L

lastmile

macrumors regular
Original poster
Mar 10, 2008
118
7
I just upgraded the firmware on my dual 2.26 quad-core 4,1 to 5,1 (anticipating upgrading to X5675s). No problems with the upgrade; the Mac now shows as a 5,1.

But when booting up the fans rev up to full speed. They drop back down after about a minute but this didn't happen before the firmware upgrade.

I tried a SMC reset but it didn't make a difference.

I was going to see what reverting to 4,1 firmware did but got the 5770 error and didn't want to get into looking into that tonight - I'm going to have to stay with 5,1 firmware when I switch to hex cores anyway.

Any help?
 
The fan should speed up for few seconds during boot. That's normal. If your Mac didn't do that, that's the fault.

However, if they spin up for a minute, that's far too much and abnormal. The only fan may keep spining fast after boot is the PCIe fan, that's a know bug. Nothing to do with the firmware update.
 
Your fans should not spin that fast for a whole minute after Starting Up . You might want to PRAM your Mac to see if that helps . Reset the motherboard again as well , once you have completed the PRAMing .

Also, do all your memory modules profile ?

Just yesterday, I had to replace the memory modules in a Mac Pro that a client brought in since their thermal sensor data was not being reported to the Mac's SMC which caused the CPU booster fan to rotate at an abnormally high rate . Replacement modules returned the System to normal .
 
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OK, I only booted the Mac once or twice before doing the firmware upgrade so I guess it's possible that the fans were an issue before I did it.

It's the PCI slot and power supply fans that are causing the noise. I do have a flashed GTX 680 installed if that would make a difference.

I did a PRAM reset and another SMC reset but it sounds like this is an annoyance I am just going to have to put up with if its a known bug.
 
That's a known bug. You can keep doong SMC reset until it clear itself.

Or, run Luxmark after boot, once the GPU under stress, the fan will go back to normal. (No need to go through the whole 2min cycle).

Or, you can use something like MacsFanControl to manually set the fan profile (recommend base on PCIe ambient temperature). This can permanently fix the issue (as long as the apps works).
 
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