2008 Mac Pro | constant fan after memory upgrade

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2008 Mac Pro | constant fan after memory upgrade

Hi All,

I just brought my Mac Pro memory up from 26 to 32gb of RAM and the fan is running constantly. Is this the price of more memory, or is there something I can do to quiet this monster down? Specs below:

Model Name: Mac Pro

Model Identifier: MacPro3,1

Processor Name: Quad-Core Intel Xeon

Processor Speed: 2.8 GHz

Number of Processors: 2

Total Number of Cores: 8

L2 Cache (per Processor): 12 MB

Memory: 32 GB

Bus Speed: 1.6 GHz

Boot ROM Version: MP31.006C.B05

SMC Version (system): 1.25f4

System Version: OS X 10.10.5 (14F1713)

Kernel Version: Darwin 14.5.0

Boot Volume: Macintosh HD 2

Boot Mode: Normal

Chipset Model: NVIDIA GeForce GTX 770

Type: GPU

Bus: PCIe

Slot: Slot-1

PCIe Lane Width: x16

VRAM (Total): 4096 MB

Vendor: NVIDIA (0x10de)

Device ID: 0x1184

Revision ID: 0x00a2

Thanks!

Mac Pro, Mac OS X (10.6.8)

Posted on May 4, 2016 5:44 PM

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Answer 1

May 4, 2016 7:26 PM in response to conduit

The Mac pro uses measured temperature from many places inside the cabinet in a feedback loop to control fans speeds. If data are not available, the only fail-safe solution is to run the fans at maximum speed.

When you buy replacement RAM that does not have the required Apple-approved temperature sensors on board, the fans will run at full speed. Return those for the correct modules and it will all calm down to reasonable speeds again.

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