My 4,1>5,1 has a 5°C difference. Normal.
It would seem that increasing Exhaust fan speed might reduce the difference slightly.
Off topic :
I would love to learn how to wire up new Noctua Intake & Exhaust fans original Apple cables to work with Apple thermal sensing.
Possible ? All ideas more than welcome !
I have already bought ( for my PSU ) a Noctua 120MMx120 NF-A12x25 fan kit
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. . . .along with the Noctua NA-FX1 fan controller fan kit
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- I have both a passive thermal sensor along with a Laser Thermal gun to monitor PSU temps so I don't need Apple Thermal monitoring. Anything under 40°C for the PSU in summer will please me.
This is normal. What is not normal is CPU B hotter than A. Which I have seen in the thread where people try redirecting the fan flow towards the Northbridge diode.
Bear in mind that my main plan is to use a Noctua PSU fan without Apple thermal control but as I posted before, I can easily monitor and control that.Very curious how this works out for you. These kits are really nice and have been looking at them for a while now....
Bear in mind that my main plan is to use a Noctua PSU fan without Apple thermal control but as I posted before, I can easily monitor and control that.
I'm going to contact Noctua regarding pinouts for their 80mm fans for the CPU Tray ( Intake & Exhaust ) to make them Apple thermal control compliant. It's all about the cable pinouts ( hopefully ).
Seeing that there are still literally millions of working, aging cMPs out there it could be good for Noctua to come up with a "Mac Pro Noctua fan adaptor cable kit". It is certainly worth considering and their fans are excellent and well crafted.
NOTE : The 4,1 & 5,1 's PSU fan cable runs UNDER the motherboard= a time consuming pain in the arse to remove.
Mac Pro fan RPM measuring is completely different than what PC fans use and the signals are not compatible at all.The thermal control aspect is what's deterred me from going further. Cable routing does sound like a royal pain... I'll keep my eyes open for what developments you discover on this front. Time and money are something I don't have a lot of to invest in this area right now. Appreciate your efforts!
That Austrian ? guy's video is spot on - he is truly bi-lingual but I cringed when he picked up the CPU Tray by the heatsink ! Definitely a NO NO with 4,1 & 5,1's trays.
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At the moment, in my De-dusting & cooling the Northbridge epic, https://forums.macrumors.com/thread...mp-reduction-in-dual-cpu-cmp-4-1-5-1.2179729/ the PSU temps are the only thing that concerns me, especially as I'm in humid, fiercely hot Japan. Yet due to Climate Change JP's Summer has been peaking about two weeks earlier since I first arrived here in 1994.
I'll report any developments re: CPU Tray area Intake & Exhaust fans.