Mac Pro 4.1 2009 board that support CPU-Tray with single CPU

[ammoune78]

Hi,
I've found on everymac, that my replacement logicboard, only support single CPU. While my faulty board support double cpu, maybe this is why the CPU Fans on the double CPU-Tray are running at full speed. Is there a trick to solve that problem?
Thanks

 

[tsialex]

Hi,
I've found on everymac, that my replacement logicboard, only support single CPU. While my faulty board support double cpu, maybe this is why the CPU Fans on the double CPU-Tray are running at full speed. Is there a trick to solve that problem?
Thanks

This is a no-issue.

All 4,1 and 5,1 backplanes are EXACTLY the same, the only difference from 2009 to 2010/2012 is that the 2009 come from factory with SMC 1.39f5 and the 2010/2012 ones with 1.39f11. Zero diff between single and dual Mac Pros.

 

[kohlson]

EXACTLY the same

May I ask a point of clarification?
A friend with a 2010 single CPU wants to upgrade to a dual CPU. Does he just need a dual CPU processor board?

 

[tsialex]

May I ask a point of clarification?
A friend with a 2010 single CPU wants to upgrade to a dual CPU. Does he just need a dual CPU processor board?

He needs to buy dual 2010/2012 CPU processor board, 2009 will mismatch the SMC and all fans will run at full RPM.