Running idle for about half hour. But i should mention it is about 2 feet from AC unit. My other PC's in room are usually about 34 celcious in summer time.
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MP 1,1-5,1 Northbridge Temp
- Thread starter s.m.t.
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I did a little mod with my 2 x 3.46 Mhz 6 Core and a Full PCI Bus.
Cooler Northbridge on The Mac Pro 5,1 Dual CPU
Thanks for the post, I must say this is a very informative read on a problem I've been avoiding for 5 years Since I'm an old school engineer I'll make a passing comment that everyone should carefully avoid blocking a heat sink. I'm pretty sure that obstructing the intake of any fan reduces its...
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Cooler Northbridge on The Mac Pro 5,1 Dual CPU
Just a quick update with Fans speeds achieved, which is "nearly normal" as per "auto" settings
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5,1 Mac Pro water cooled project - Working, with photos
@p11hlf Thanks for the post the watercool and your neat metal work looks good. Will you post your NB Heats sink shroud on thingiverse or another site ? I'd like to get some basic measurements on the Heatsink, I'm a bit stuck as I've only got one cMP 5,1 and I use it ! I'm keen to get a shroud...
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I have play around with Mac Fan Control so long, but i never get optimal settings with it.
Now i have TGPro running. The advantage of TGPro is that you can add 10% to the standard rpm curve for example.
Here you can also setup, that Intake and Exhaust on 1000 rpm at idle to keep the Northbridge cooler and when the CPUs are calculating the Fans normally speed up.
What is the advantage ?
This has worked well for me for many months.
My only complaint is it does not load until AFTER login.
Therefore My NB Deta TºC goes unmanaged until I Login.
Then you never used all cores for calulating for a longer time. I had a setup like you for around three months.
The problem: When all cores are working, CPU-Pack-A is getting hotter, but not the Northbridge. The fans does not react to this situation, the CPU-Pack-A goes up to over 90°C and start with throttling.
Meanwhile Mac Fan Pro is thinking: Oh, the Northbridge is pretty cool, Booster-A can stay at 799 and Intake at 1200. Ok, the Exhaust speed up, but this is not good like Booster-A and Exhaust together and i would say it is much louder.
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Thanks
I had not considered that yet It did not show as a problem when I ran tests for 45 minutes all cores. I sue VMware fusion so my calcs are "randomised" following the host loads.
I will recheck ! Thanks
Cooler Northbridge on The Mac Pro 5,1 Dual CPU
@h9826790 Yes that is indeed a great idea. I've also been thinking of a way to get more air over the NB Heatsink. I was just brute forcing the problem for a few days with a Macs Fan Control driven brute force attempt at pushing more air through the A CPU ( at rear of the Mac ). I'm just...
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IMHO this scenario is quite easy to avoid by either:
- set the Boost A fan more agressively and the Intake less agressive .
In my setup (both fans at NB diode=sensor and min T=55 maxT= 75 ) the intake is between ~800 and ~ 1200 rpm.
The Boost fan is at ~ 1100 at idle and increases with NB T (and indirectly with the CPU load).
At least in my setup the NB Temp is directly related to the CPU(s) load so both are controlled this way.
Or:
- Intake fan set as above and the Boost fan set to "auto" it will spin at ~1100 at idle and respond to the CPU load as the SMC dictates.
This should keep the CPU A at safe Temps (but we know the way Apple weighs noise vs Temps may lead to high Temps before the fan(s) really ramp up).
If not:
- set Intake to NB diode=sensor as above and Boost A as CPU A= sensor min T= 55 maxT = 80
Based on loads of tests the Exhaust fan can be left to auto (=min rpm) as it mainly adds noise and not lowers significantly any Temp .
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For a dual CPU , running at idle, fans all at "auto" and not being in a tropical climate this is more or less "normal" IMO.
Note that the NB heatsink and die should have good thermal contact , indicated by a Delta NB diode vs NB heatsink of ~ 12 Celsius max.
75°C is a common answer. So your machine is ‘normal’. However, most of us having started looking at this weak spot in the design have taken steps to
1. Replace retaining pins
2. Repaste the heatsink
3 clean the heat sink and the fans
4. Put some more ‘modifications’ in place
Here’s my journey.
I run at mid 50°C now
Post in thread 'Cooler Northbridge on The Mac Pro 5,1 Dual CPU'
https://forums.macrumors.com/thread...he-mac-pro-5-1-dual-cpu.2173519/post-28485488