Chosen Solution
Hello. I use Mac Pro 2011 (12?) with dual x5670 CPUs. When I try to boot with one CPU removed, it gets fans rev max speed and makes hugh noise. These are my attempt : 2 CPUs - normal 1 CPU on socket B - no boot (blink white led) 1 CPU on socket A - boot, but fans rev max speed. 1 CPU A with 1 cooler - max rev 1 CPU A with 2 coolers - max rev I know swap with the different firmware CPU tray makes max fan, but thats begin immediate booting. In this case, it start with normal quiet, but getting super fast after a minute or two. Either Mac OS and Windows. Also I found not important much but wierd symptom, CPU temp is very normal, but TDP is always max(checked HWMonitor on Windows). Is this intended behavior? Like alarm for broken or not recognise one CPU or stealing one?
When doing any major changes like a CPU change, you will need to use the original system installation disk and run the fan syncing software, or you will get run away fans issues.
