Yey! Did it....late but not the last

[krishnaM]

I am really excited to tell you'll that I upgraded my cMP 2009 quadcore with X5690 cpu this weekend. Thanks everybody who helped me during this process:

https://forums.macrumors.com/threads/help-unable-to-reset-nvram-on-macpro-2009.1936737/
https://forums.macrumors.com/threads/help-needed-for-purchasing-used-mac-pro.1934926/#post-22195025

Every thing is running fine. The SMC temp 36C during casual use. Now I need to test the cpu under stress. Do you recommend using the terminal for this?

http://osxdaily.com/2012/10/02/stress-test-mac-cpu/

Krishna

 

[h9826790]

The YES command works quite well to stress the CPU, just make sure you do kill all of them when you want to stop.

 

[krishnaM]

Thanks. I didn't have the courage after previous mishap. I tried it on all 12 thread together and slowly the SMC temp went up. After about 7-8 minutes, I turned it off as the temp reached to about 68F. The fan speed stayed at around 800rpm. Is that normal? Shouldn't the fan speed increase as the cpu temp went up?

 

[krishnaM]

Should I manually increase the fan speed during high cpu activity?

 

[ActionableMango]

Nice upgrade!

Personally I use Handbrake to hammer the CPU and Furmark to hammer the GPU. Actually, I use Handbrake all the time as it is doing real work. It maxes out all cores quite nicely.

No you don't need to manually adjust the fan speed. The fans take care of themselves when needed. If anything is wrong like a disconnected temperature sensor, they run full speed, not slowly.

 

[krishnaM]

Nice upgrade!

No you don't need to manually adjust the fan speed. The fans take care of themselves when needed. If anything is wrong like a disconnected temperature sensor, they run full speed, not slowly.

The fan is staying at same speed whether the SMC temp is 36F or 68F. Shouldn't it automatically increase? Is the SMC reliable? I see you all use iStat pro instead.

 

[h9826790]

There is nothing to worry about. And I guess you want to say the CPU diode temperature at 68C, not the SMC temperature at 68F.

Anyway, 68C is nothing for the X5690. The Mac usually won't spin up the fan until the CPU reach 80C. Then the fan will spin up a bit to keep it work at around 85C. That's completely normal.

Of course you can install some fan control software, but it's your own preference, not necessary.

 

[ActionableMango]

The fan is staying at same speed whether the SMC temp is 36F or 68F. Shouldn't it automatically increase? Is the SMC reliable? I see you all use iStat pro instead.

It's not 1-to-1 fan speed to temperature. There is a minimum fan speed that covers a large range of temperatures at the lower end.