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The 2013 revamp of the desktop Mac series known as the Mac Pro.

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PCIe Diode temperature - any physical solution?

Hello folks at iFixit,

as seen in my own machine (and researched in many web-discussions), this Mac Pro 6,1 develops great amounts of heat alone from its "PCIe Diode"-Circuit.

As I know you iFixit-people as honest and sincere in researching and adressing repairability-issues, I want to ask especially all of you "trashcan"-users, if anybody of you has found out a way of physically modifiying this specific semiconductor with a heatsink or any other physical workaround - to push it's temperature, which on summer-days easily exceeds the recommended 70 degrees C (a value, which, by its manufacturer, is rated as highest working value).

Up to today, I personally use the software tool "TG pro" to "auto boost" the internal fan to 35% of it`s maximum of 1900 rpm always, when the PCIe diode temp goes over 70 degree C. (To imply this, go to "Auto Boost Rules", add a new rule by pressing "+", select "35" / "PCIs Switch Diode" / 70 C)

But nevertheless - besides these software solutions - hopefully some of you have found effective ways to physically duck the temperature below this critical value (without ramping up the fan...)?

Your experiences are valued! Thank you very much!

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Putting a pin in this so I remember to come back to this later. I have 5 minutes before I have to clock in for the day, and this is definitely not a 5 minutes to write it answer. Please feel free to tag me if I don't materialize in a timely fashion


@flannelist Thx, would appreciate that.


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@chrishees - Well… This gets tricky! While I agree this chip should have a sink as even my 2013 Trashcan gets too hot!

So how? I know some folks slapped on an off the shelf sink. But this only goes so far!

Once the heat sink gets saturated with heat it needs time for the heat to dissipate into the air stream and that’s the rub here! The air flow down at the base is mostly drafted to the systems heat sink, this area gets very little flow!

So one needs to get the heat higher into the chimney area without touching the systems sink or anything else. I ended up making my own sink using some thick copper for the base and copper rods mounted to this base about 3.5” long so the rods are able to shed the heat deeper in the air flow. I drilled and taped the holes and threaded the rods into the block with thermal paste in the threads and used a heat transfer double stick tape to hold the block on with a few drops of epoxy just a small dot on each side just to be sure the block didn’t shift

Now to be clear, I was a heavy graphics user when I was shooting and my data is not on the systems SSD drive I use a M.2 RAID setup via Thunderbolt so the PCI interface is running hard.

My solution is quite extreme and I fix Mac’s so I have the tools and skill to do this. I also use TG Pro to monitor things as well! Or stick with the off the shelf solution.

So consider your use and maybe getting an A/C system to cool your place maybe the better answer. Pumping cool air into the vent area might get you over heat of the day.

Reference: Step 15 in this guide Mac Pro Late 2013 Interconnect Board Replacement

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