MP 1,1-5,1 Cooler Northbridge on The Mac Pro 5,1 Dual CPU

MIKX

macrumors 65816
Dec 16, 2004
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MapleGreen

I agree with h9836790, all your temps are OK . .especially if it is summer where you are.
 

MapleGreen

macrumors member
Jun 25, 2019
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All numbers are very acceptable now.
Thanks a lot
I know this topic is about Northbridge, but I want to know your opinion about Kingston pcie ssd witch is 40 degrees, I think using heatsink may decrease its temperature too
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MapleGreen

I agree with h9836790, all your temps are OK . .especially if it is summer where you are.
thank you, It is summer definitely but I use air conditioning all the time, room temperature is about 25
 

MapleGreen

macrumors member
Jun 25, 2019
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MapleGreen

Why don't you start a new thread re cooling hot SSDs ?
I don't know if there is such a thread already?
Maybe after purchasing heatsink
Here is all about cooling with internal fans
I was wondering maybe combining two methods would be useful for pcie ssd's
 

howiest

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Aug 16, 2015
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Do you guys think this is normal?

I converted a 25 min video in Handbrake and within a very short period of time, certain temps climbed dramatically.
I find the CPU temps during conversion (2nd picture) a wee bit scary.

before conversion temps...



during conversion temps...
 

MIKX

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howiest

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howiest

This may give you some ideas

https://forums.macrumors.com/threads/de-dusting-northbridge-temp-reduction-in-dual-cpu-cmp-4-1-5-1.2179729/

Have you ever de-dusted your lower Intake and exhaust fans ? I removed a ton of dust from the lower exhaust fan. If you do de-dust them put a pencil in between the blades first and use a long haired brush.

I have two extra USB powered fans installed for teh Northbridge chip and CPU RAM. Works.
I did open it up the other day, removed the CPU Tray, and blasted out all the dust with compressed air.

I'm really curious if others see a similar temp increase when using Handbrake. Maybe it's normal, but in my pics you can see a 45 degree CPU A rise just converting a 25 minute video. I'm alarmed by that.
 

MIKX

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Howiest

Have you checked your lower exhaust fan / that's the worst one for gathering dust.

Also, are your Northbridge heatsink spring rivets OK ?
 
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firedownunder

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May 5, 2011
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Your images show a 34 degree spike, and yeah it's normal with handbrake. The PCECI (TJ Max - Temperature Junction Maximum) temp as definded by Intel is their "Thermal Specification that defines the core temperature limit at which the processor will "throttle" (reduce core speed) to protect against thermal damage". On my machine it shows as "CPU A - Relative to ProcHot".
 
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howiest

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Howiest

Have you checked your lower exhaust fan / that's the worst one for gathering dust.

Also, are your Northbridge heatsink spring rivets OK ?
Rivets are fine so far, my IOH Diode runs between 65 to 70 degrees (it's pretty warm here these days).
I bought some of those replacement rivets from China for that eventual day.
 

paulcons

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Apr 3, 2017
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Rivets are fine so far, my IOH Diode runs between 65 to 70 degrees (it's pretty warm here these days).
I bought some of those replacement rivets from China for that eventual day.
I am noticing something I see on my rig, a rather large jump between the Northbridge and it's heat sink... and my delta is about 40º. I set up auto fan control with Macs Fan Control, it's summer here and no a/c, so it runs from 73º to 78º depending on ambient and where I am running a game or not (without some extra spin, would be 80º-82º). Within known tolerances, BUT everyone seems to think I have an issue with my heat sink, but it was JUST serviced with a fresh thermal pad and no issues with the hold down rivets. Theoretically if I replace the pad with paste, I may gain about 2º, I might try it for the hell of it.

I found a really good price ($36) on a replacement tray so I bought it. Long story, the first one was badly damaged in transit, the vendor sent out a new one but even though I asked, he didn't seem to want the damaged one back (the damage was to one of the RAM slots). I am also reading everything I can so when I attempt to do anything, I know WTF I am doing, PLUS waiting for some easier ambient temps for me to work on it! PLUS I have 2 extra trays to kinda play with... I'd be thrilled if I got one of the trays to run it's Northbridge in the 60s even lacking fan spin.
 

fatespawn

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Feb 22, 2009
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I'd be thrilled if I got one of the trays to run it's Northbridge in the 60s even lacking fan spin.
See my post #14 for my solution for a broken northbridge rivet.

High 70's seems a bit high for the diode. After applying new thermal paste, mine barely moves. The problem was my thermal paste was all dried up after 10 years - and then of course a rivet broke and I replaced it with some nylon fasteners. I had to scrape off the thermal paste (carefully) with a plastic tool.
 

MIKX

macrumors 65816
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TzunamiOSX

It would depend on the fan's CFM rating but you should try it and report back.

Personally, I would orient that fan 90° so that the airflow is directed to the base of the NB heatsink.
 

flyproductions

macrumors member
Jan 17, 2014
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Close up.
View attachment 827332
Note : The black thing is a USB 3.0 external dock - not related to the fan cable.
Just came across this thread and started from beginning.

Sorry, but you did not really cut the MPs’s side panel and sat some clunky USB-hub besides it just to lower the northbridge-temp by a few degrees...which could have easily been reached by increasing the speed of the stock-fans a bit via Macs Fan Control...if necessary at all?

Surely not my cup of tea!
 

MIKX

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flyproductions

1.
Did you see in my post that that side panel is actually from a cMP 2,1 ? my current cMP is a 4,1>5,1.
( I also drilled a hole in that side cover to insert a drive-activity LED which is attached tomy Samsung M.2 970's M.2 PCIe adaptor - very useful ! )

2.
I replaced that "clunky" USB-external DOCK ( it's not a HUB. - with a USB 3.0 two HDD/SSD drive extrnal DOCK which is powered from it's own AC power adaptor and is attached to my Inateck USB 3.0 PCIe card

3.
The "black cable is no longer there.

4.
I live in Japan. This summer, in August we had many days with consecutive 39 ~ 40°C / 102 ~ 104°F temperatures.
I now have a 16.5 CFM fan powered from Drive bay #3's SATA - this fan cools my Northbridge.

in 2018, prior to installing the SATA powered fan my Northbridge was running at 75° ~ 85°C / 167° ~ 185° F in Summer. I don't know where you live but I think that the above higher temps are excessive and just heating up the whole area around the Northbridge
Since August 2019 ( peak summer here ) my Northbridge has maintained - at idle - 56° ~ 59°C. / 132.8 ~138°F - under sustained stress.

I not only regard this Northbridge SATA powered fan as neccessary but absolutely essential in Japan's summer.

Perhaps this thread https://forums.macrumors.com/threads/de-dusting-northbridge-temp-reduction-in-dual-cpu-cmp-4-1-5-1.2179729/ may elucidate for you precisely what I am getting at.

I assure you that I have given "cooling the Northbridge" a great deal of time and experimentation and refinement, I regard this project a resounding success.

PS : On the hottest days I DO use Macs Fan Control very moderately.

Summary : The combination of a high CFM fan along with mild CPU fan speed adjustments is a workable compromise in reducing the cMP Northbridge temperatures. A thorough de-dusting of the cFM case - including the 'cheesegrater case holes also yields real case temp reductions.
 

flyproductions

macrumors member
Jan 17, 2014
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prior to installing the SATA powered fan my Northbridge was running at 75° ~ 85°C / 167° ~ 185° F in Summer.
I have 75ºC all the way, which to my knowlege is exactly what most users experience and is widely considered normal.

Anyway, i gave Macs Fan Controls a quick try with a northbridge diode based setup for intake and exhaust with an "increase" value of 65ºC (which should be on the very sure side for that component) and a max value of 75. This gave me an instant drop of nearly 10 degrees for the northbridge with a barely audible ~300 r/pm spinup of the fans.

I think, if i ever find it necessary, this would be my choice instead. ;)

northbridge.jpg
 
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MIKX

macrumors 65816
Dec 16, 2004
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flyproductions

My NB is currently running considerably cooler than yours. 😇

Have you ever removed your CPU tray and de-dusted the Exhaust fan and all the 'cheesegrater case holes"?
Doing that alone yields a noticeable temp reduction and increases the fan efficiency.

Anyway, enough. . to each his own.

4,1>5,1 DP 2.93Mhz temps Sept. 22nd. 2019.jpg
 

flyproductions

macrumors member
Jan 17, 2014
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My NB is currently running considerably cooler than yours. 😇
Yes! ...while you put considerably more effort to the topic with even (IMHO) destroying the beauty of the case itself. Without any real need to do so, as nortbridge-chips are known hotrunners and should easily take temps around 70ºC for extended periods of time without any danger of dammage.

But, as you said: to each his own.