XU4 heatsink

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n8xyn
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XU4 heatsink

Post by n8xyn » Thu Feb 27, 2020 12:37 pm

I own several Odroids of various types and love them. My newest is an
N2 and it performs flawlessly so thank you for the fine work. I do have a question though, I'm trying to put two XU4's to work doing seti@home which means they need to run 24/7 at 100% load. I have both of them with large 40mm x 40mm x 38 mm heat-sinks and 40 mm fans. The best I can manage is 1500mhz and keeping them at about 55c. I've noticed the heat-sinks seem to have a slight tilt away from the soc and I'm wondering how do you deal with that fact when you make the quite version of the XU4? I'm assuming the soc is slightly taller than to other chips near it? Thank you.

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Re: XU4 heatsink

Post by odroid » Thu Feb 27, 2020 2:10 pm

This thread might have a hint of the tilt issue.
viewtopic.php?f=99&t=37418

BTW, what happens if you set the max clock frequency at 1.7Ghz?
If the CPU temperature is not over 75°C, you can keep running 24/7 with that configuration.

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Re: XU4 heatsink

Post by o_lampe » Thu Feb 27, 2020 4:48 pm

Back in the days, when CPUs were slow and expensive, I was a serious 'overclocker'. It was a standard procedure to sand and polish the heatsinks until they shine like mirrors. And ofcourse, a good contact between CPU and heatsink was important.
I bet, it would also help in these cases.
A blue heatsink might sell better, but the contact surface ( see odroids link ) looks, like it was cut with a hacksaw. ;)

I found an old pic of a selfmade watercooling block. AMD Athlon 1GHz running stable at 1.7GHz :D
PC-cooling_side2.jpg
PC-cooling_side2.jpg (51.33 KiB) Viewed 1513 times
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mad_ady (Thu Feb 27, 2020 4:55 pm) • n8xyn (Fri Feb 28, 2020 2:32 am)

n8xyn
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Re: XU4 heatsink

Post by n8xyn » Fri Feb 28, 2020 2:40 am

o_lampe wrote:
Thu Feb 27, 2020 4:48 pm
Back in the days, when CPUs were slow and expensive, I was a serious 'overclocker'. It was a standard procedure to sand and polish the heatsinks until they shine like mirrors. And ofcourse, a good contact between CPU and heatsink was important.
I bet, it would also help in these cases.
A blue heatsink might sell better, but the contact surface ( see odroids link ) looks, like it was cut with a hacksaw. ;)

I found an old pic of a selfmade watercooling block. AMD Athlon 1GHz running stable at 1.7GHz :D
PC-cooling_side2.jpg
I have considered water cooling for sure, but that's imo overkill for a small sbc. I wonder if since that "unlevel" exists if might a high quality thermal pad like fujipoly be a better choice rather than thermal paste? I have another XU4 where I used a piece of cardboard and the heatsink is much better as is it's cooling. I ordered some low end silicone thermal pads of various thinkness to see if I can just use one of those on the low end instead of cardboard to level as well as cool that chip. Something to play with if nothing else :-)

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Re: XU4 heatsink

Post by n8xyn » Fri Feb 28, 2020 2:53 am

odroid wrote:
Thu Feb 27, 2020 2:10 pm
This thread might have a hint of the tilt issue.
viewtopic.php?f=99&t=37418

BTW, what happens if you set the max clock frequency at 1.7Ghz?
If the CPU temperature is not over 75°C, you can keep running 24/7 with that configuration.
Actually at 1700 the one where I used a shim to level the heatsink can maintain about 60C.

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Re: XU4 heatsink

Post by o_lampe » Fri Feb 28, 2020 3:31 pm

You can remove the capacitor ( shown in odroids link), if it's too high. It has no other functions then leveling the heatsink.

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