Heatsink modding

[Bitolo]

First of all, Hello. This is my first post.Was a Lucky to find this wonderful forum. After I Have been reading the post for days, I decided to start the mod of my Pipo.
Well, I Have thought to buy this 5mm pad to put on the bottom

http://www.****.es/itm/121310218629?...84.m1423.l2649

Inside the Alu plate this 1mm pad

http://www.****.es/itm/121159893475?...84.m1423.l2649

Then, I wanted to use 2 of* this Heatsink.

http://www.****.com/itm/131132044387?redirect=mobile


But, after read this post

Yesterday I tried some heatsinks with the PCB out of case.

I think, the most important is the heatsink over the cpu, with one 37x37x30 mm the system goes perfect, temps never go to 70º. It can't be fixed because don't fit (with hole in case, could be)

With 12 mm heatsinks the system goes hot over 70º, almost 80º at stress tests. (No one better than play 20 minuntes of 1080 video with chrome, IE works smoothly)

I put 1 mm. thermal pad inside alu plate.

Today I hope do some more test for choose heatsinks.

Some pictures of thermal pad, 12 mm heatsinks, and 12, 15 mm. heatsinks

[ATTACH=CONFIG]10692[/ATTACH][ATTACH=CONFIG]10691[/ATTACH][ATTACH=CONFIG]10693[/ATTACH]

EDIT: with picture of bottom case:

[ATTACH=CONFIG]10694[/ATTACH]

EDIT2: temperatures by playing 15 min vimeo video 1080 with 15 mm heatsink and closed case, by the way case goes hotter than without mod.

I am thinking to make a hole in the top to install a 30mm heatsink if really exist a cooler improvement.
What do you think about it? Is it worth a try?

[avdey85]

tuning Pipo

I solved my problem with overheating somewhere for $ 3.5 , bought thermo 0.5mm and 40mm x 40mm single x 10mm
radiator and copper plates (at work picked up ) all blind and now the temperature is above 60 ° C does not rise , and before that zadolbal throttling console was heated to 80 ° C, and it all starts so terribly laggy , right now, this is not, I enclose a photo of tuning

[smokie171]

I changed my mod by replacing 30x30x15 mm heatsinks with 25x25x12 and I am using 5mm thermal pad under pcb and the temp rose by 4 Celsius to 41 at idle vs 37 at idle with 30x30x15 heatsinks. Being that I lowered the height of the heatsinks used, i used thermal adhesive instead of thermal grease like in my first mod which could result in the increase in temp that I am seeing. I think I can gain back the lower temp by adding phobya pads over cpu and memory. I am not sure as to how much improvement I will gain by doing this because after looking under alum plate I realized there are only 2 small pads to replace as thermal grease was already applied to the memory chips in the factory, and I do not think the pads will be as efficient as the grease. By using the adhesive thermal compound instead of grease my heatsinks are permanently attached. I do not think I can undo this. I had to move a heatsink while it was setting and this was very difficult after 15 minutes and now it has been 24 hours later. I would definitely recommend the 15 mm high heatsinks and attaching by using thermal grease.
Kevin

I was able to remove 25x25x12 heatsinks and replace with 30x30x15 mm, attaching them with thermal grease. My temp dropped back to 37 Celsius at idle. I also applied thermal grease to memory chips.
Good Luck to all.
Kevin

[Vinchenzo]

I was able to remove 25x25x12 heatsinks and replace with 30x30x15 mm, attaching them with thermal grease. My temp dropped back to 37 Celsius at idle. I also applied thermal grease to memory chips.
Good Luck to all.
Kevin

hi again friend,
thank you for that you share with us your different ways of modding,
looking for optimal!
What is the thermal conductivity on the grease you used?

[smokie171]

hi again friend,
thank you for that you share with us your different ways of modding,
looking for optimal!
What is the thermal conductivity on the grease you used?

I am using arctic silver 5. I am not sure what it's thermal conductivity is. Good luck my friend.
Kevin

[Vestiaz]

First of all, Hello. This is my first post.Was a Lucky to find this wonderful forum. After I Have been reading the post for days, I decided to start the mod of my Pipo.
Well, I Have thought to buy this 5mm pad to put on the bottom

http://www.****.es/itm/121310218629?...84.m1423.l2649

Inside the Alu plate this 1mm pad

http://www.****.es/itm/121159893475?...84.m1423.l2649

Then, I wanted to use 2 of* this Heatsink.

http://www.****.com/itm/131132044387?redirect=mobile


But, after read this post





I am thinking to make a hole in the top to install a 30mm heatsink if really exist a cooler improvement.
What do you think about it? Is it worth a try?

I have no idea, dont take my post as I were knowledge, I only doing supositions. Tests I did out of the case were good, but I will try others things before doing hole to case.

[loko]

By using the adhesive thermal compound instead of grease my heatsinks are permanently attached. I do not think I can undo this. I had to move a heatsink while it was setting and this was very difficult after 15 minutes and now it has been 24 hours later.

I was able to remove 25x25x12 heatsinks

Thermal adhesive paste becomes brittle in deep freezer temperatures.

[smokie171]

I have no idea, dont take my post as I were knowledge, I only doing supositions. Tests I did out of the case were good, but I will try others things before doing hole to case.

I would cut a hole in the case only as a last resort. You should see vast improvement with the 5mm thermal pad you are buying. I would use heatsinks with a height of 15 mm. I would only cut a hole in case if I were using a fan, which in most cases isn't necessary. Good luck,
Kevin

[smokie171]

Thermal adhesive paste becomes brittle in deep freezer temperatures.

Thanks for the tip. I will file that away for future use. Your advice and support is invaluable. Thanks again,
Kevin

[drdtyc]

For those who, like me, are not so handy to do the mod, can buy a cheap USB-powered fan and aim it at venting grid on one side of the TV box so that heat inside would be forced out through the venting grid on the opposite side of the box.

[yever]

For those who, like me, are not so handy to do the mod, can buy a cheap USB-powered fan and aim it at venting grid on one side of the TV box so that heat inside would be forced out through the venting grid on the opposite side of the box.

I am not so handy either, but the 5mm pad sounds very easy to do, and from what I have read, it will give the most thermal benefit. I am still waiting for mine to arrive.

[vertical]

I am currently waiting for 5mm pad + two 30x30x9.5mm heatsinks. I was wondering if putting the heatsinks on top of the metallic plate with two 30x30x5mm thermal pad pieces between the plate and the heatinks (as adhesive) will work. The pad is squeezable and even if it touches the case, it can be pushed down so I don't risk breaking something. The pad is 5W/mK. The heatsinks will 'sit' on the pad using an akasa adhesive tape.

[loko]

I am currently waiting for 5mm pad + two 30x30x9.5mm heatsinks. I was wondering if putting the heatsinks on top of the metallic plate with two 30x30x5mm thermal pad pieces between the plate and the heatinks (as adhesive) will work. The pad is squeezable and even if it touches the case, it can be pushed down so I don't risk breaking something. The pad is 5W/mK. The heatsinks will 'sit' on the pad using an akasa adhesive tape.

It will definitely be worse. You want to extract heat from the processor as quick as possible.

Copper has a 400 W/mK thermal conductivity, Aluminium has 200 W/mK thermal conductivity, Thermal Pastes have a 5-10 W/mK thermal conductivity, Thermal Pads have a 1-5 W/mK thermal conductivity, while Thermal Adhesive Tapes have a 1 W/mK thermal conductivity.

If you put extra thermal pads between the processor and the actual heat sink, you will increase the total thermal resistance, thus you will decrease the total thermal conductance.

[geppetto61]

Hi sorry to jump in but i have a very trivial question

Speaking of fans:
1) the hot air must be extracted from the inside or
2) external "fresh" air should be blown against the parts to be cooled down ?

However i tend to think that in general passive cooling is challenging.
Big heatsinks are usually required.
Thanks again for the very valuable advice

[no_spam_for_me]

Blow "fresh/cool" air to/at/over/through the heatsink...
The best way would be to find a way to transport this warmed up air directly (as possible) out of the device...