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RPi3 overheating

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DaOld Man:
OK , final test results.
After letting it alone with the attract mode screen saver running.
10:23 AM 74.1C
The genesis console was sitting on the floor, with carpet underneath.
I decided to set it on a hard back book, to allow air to circulate under the case. (Pads on bottom should raise case about 1/8 inch off surface).
10:30 AM 75.2C
10:45 AM 72.0 C
Surprisingly, it didnt seem to make any difference if the air slots on bottom were covered or not. I sat the case back on carpet.
11:15 AM 71.4 C
Well, I guess thats it for now, unless I see some unusual behavior later.
What did I learn?
I will not waste money on the cheap "stick on" heatsinks.
My next project I will use a "real" heat sink with silicone heatsink compound.
Will probably mount heatsink in a similar fashion, unless I come up with something better. Probably wont use the hotglue for this, I can see where it could be a mess if it gets hot enough for the glue to run.)
Here is my rig, with a Gigaware USB controller:



I shut it down and pull top cover off, while glue was warm the blobs came off pretty easy. Glue was soft but not to the point of becoming liquid like it was yesterday.
Maybe the paper clip wire pressed the heatsink down closer to the cpu when the glue softened, allowing better heat transfer? I dont know.

morton:
There are people who were running a Pi in the Genesis USB case at one point. Was cool given the only real product at the time was the baby Nintendo. Saw one Genesis USB with a tiny fan to cool the Pi.

Mine is in one of those Flirc cases. The whole case acts as a sink. I am not sure what the tape used is or if it's the good stuff, but have never had any heat issue in a case that is basically the size of the Pi. Maybe it's never been an issue due to how I use it?

There is a cool video where a guy goes all out using a piece of copper, and then a CPU sink and fan, which is excessive... But makes me wonder if moving air through the sink is the only way to make a sink inside enclosure efficient?

There are now dedicated coolers that look insanely over the top and I want to try one but haven't found the need yet. I also feel like getting airflow is good... Maybe some slightly taller feet and an intake fan to pull cool air in and displace the hot air? That Argon case looks like a cool one if you're familiar.

There are obviously lots of solutions, but I appreciate the people who manage to find their own solutions or work with what they have. Probably get more done. I only manage to make excuses LOL. 

mahuti:
This is the cooling tower I use for the emby server . Its over the top and doesn't fit in a case.

That said, when not overclocking drastically I've only ever had heat issues with the Pi4. One time I had it laying flat on carpet and it overheated. Turning on its side caused a major cooldown with no fan or heatsinks involved.

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