Heatsink mod! Must read it if you use Fan control!

Hi!

Sorry for my poor english..

First of all, i get this nice heatsink from a Fonera router (i will replace the heatsink of the fonera with a bigger one)

As you can see on the picture it must be folded a little bit because it's not exactly the size(it's too high) but it's a good tuning for the heatsink as well.


In the heatpipe of the Aspire One I tried to place the fonera heatsink in the middle way but i realized that the chipset (vga?) is much hotter in use than the cpu and this is very important for the fan control users (like me)!

The fan control works with reading the data from the heat sensor of the CPU (i think that is the core temperature) so if your fan control is switches the fan ON around 70-85celsius I'm sure about the chipset and the cicuits around it can be burned (without mod).
Even if you check the underside of the AA1 with your hand that point is very hot while in use.


So i placed the heatsink to the place of the vga chip like this:

----------------------------------------------------------------------------------------
XP 8gb ssd
I got this results in idle mode (cpu use 0-8 %, wlan OFF, Screen ON (max) ) and AA1 fan control (FAN OFF)

Celsius / Time
37 0:00
40 1:31
45 4:45
50 9:30
55 18:58
56 22:47
57 26:41
58 31:37
59 37:32
60 48:46
61 After 3hours. Never higher than 61Celsius.
---------------------------------------------------------------------

I got this results in full mode playing -looping- a 3min. blue-ray movie sample. (cpu use 85-98 %, wlan OFF, Screen ON (max) ) and AA1 fan control (FAN OFF)

Celsius / Time
40 0:00
50 0:17
55 0:38
60 1:48
65 3:34
70 6:07
75 10:14 I didn't let it to reach higher than 75Celsius.

The end of the test the underside of the AA1 was a little warm on the side of the CPU and warm on the side of the chipset. Before this mod the both side were hot.

 

Hmmm...interesting results.


Would you by chance have any results running the same tests before the mod?

That would really help with determining the value of a heatsink mod.

 

No, unfortunately I have no results before but maybe other users could check it.
Before, the vga chipset and the cpu were hot most of the time.

 

I actually believe the VGA chipset is the one that uses the back of the keyboard plate as the heatsink, and that the one you're talking about is the north or southbridge (not sure) Chipset for everything else- sata, usb, etc.

 

Nope, thats the southbridge, the northbridge uses the same heatsink as the cpu

 

Ok, thanks for the info. So, that bridge was very hot in use. I think it is very dangerous to use the Aspire One with the AA1 fan control program without additional heatsink mod.

 

yeah, I only use the program if I am in a quiet room, because the whole system feels like a heat pad after a while.

 

I'm very interested in doing this mod on my AA1. How did you attach the heatsink fins to the fan assembly? Unfortunately the pictures don't quite show the solder process. I was thinking about using a large number of nickel plated thin fins from an old AthlonXP heatsink but I'm not sure what way is the best to attach them. I think that this combined with a ceramic resistor on the fan line would drastically improve temperature and noise, especially if I can get the fan to run at a constant low speed.

 

The heatsink of the fonera had thermal tape on it and added silicone thermal compoundand and tape from outside.
Without soldering.
I will take more shots because i have to open it again.. (modding)


Unfortunately I have no temp. results before the mod... Somebody please?

XP 8gb ssd
I got this results in idle mode (cpu use 0-8 %, wlan OFF, Screen ON (max) ) and AA1 fan control (FAN OFF)

Celsius / Time
37 0:00
40 1:31
45 4:45
50 9:30
55 18:58
56 22:47
57 26:41
58 31:37
59 37:32
60 48:46
61 After 3hours. Never higher than 61Celsius.
---------------------------------------------------------------------

I got this results in full mode playing -looping- a 3min. blue-ray movie sample. (cpu use 85-98 %, wlan OFF, Screen ON (max) ) and AA1 fan control (FAN OFF)

Celsius / Time
40 0:00
50 0:17
55 0:38
60 1:48
65 3:34
70 6:07
75 10:14 I didn't let it to reach higher than 75Celsius.

 

I just did the heatsink mod today. These are the parts I used.

http://bestbyte.net/mm5/merchant.mv...BB&Product_Code=COMETTCC25&Category_Code=COVG
http://bestbyte.net/mm5/merchant.mv...=BB&Product_Code=COTIASASA&Category_Code=COTI

The heat sinks were a little too tall. I had to file them down by 1 mm so that they would be flush with the side of the fan. The heat sinks actually had glue on the bottom of them so I didn't really need the arctic silver adhesive. If I had known that I would've just saved the $7 and not get the arctic silver, but since I got it already, I used it. I really wish I can test the temp but I messed up my zif cable while filing it down to try to install the 1.8" toshiba hdd. I probably have to wait 2 weeks before I get the replacement cable.

 

Hi!

I've bought a northbridge heatsink set from Conrad (electronics shop in germany) and placed the best fitting heatsink directly over the northbridge. 5mm height works best.

http://www.acer-userforum.de/thread.php?postid=47922#post47922

Temperature climbs a bit slower if the fan is off. Fan cooling seems to be a bit more efficient, but it still gets very hot without fan after a while. The best solution would be a non whining fan.

 

Hi nobody,

What kind of interface are you using between the northbridge cooler and the original heatsink? Thermal epoxy or just plain thermal paste?

I deciding between soldering on fins that I will cut off an old AthlonXP heatsink (harder) or slapping on an old TNT2 heatsink that would probably fit very well (easier).

 

Hi!

I used the adhesive thermal pad that was already attached to the heatsink.

 

can you post the link to the product in the conrad shop?

danke !

 

Ich habe das Set im Laden gekauft, aber das hier müsste es sein:

http://www.conrad.de/goto.php?artikel=998711

Der Preis stimmt auch überein und man kann im oberen Teil des ersten Bildes den von mir verwendeten Kühlkörper sehen.

Versprech Dir aber nicht zu viel von der Wirkung

 

i bought same at conrad shop, 3 different chipset cooling heatsinks for about 7 € 1 piece fits perfectly, have a look ![attachment=1:if6fpio3]cool0.JPG[/attachment:if6fpio3]

[attachment=0:if6fpio3]cool.JPG[/attachment:if6fpio3]

 

Sorry, my camera is broken so no photos :/. I wish I had easy access to low profile northbridge heatsinks like the ones you guys bought from conrad.

I ended up cutting up my old AthlonXP heatsink and folding the fins into this shape:
_ _
|_| |_| |_| <- folded fins
=========== <- layer of Ceramique
+++++++++++ <- base of stock heatsink

applied Arctic Ceramique between the fins and the existing heatsink, soldered the edges down to the heatsink.
Also replaced the stock thermal pad (gray colored thin elastic material) with Ceramique.

I ran OCCT and loaded up the processor and hit 51C load with the fan on. Same test before, it would read 60C with the fan on.
Now idles around 45C without the fan on. Previously idled around 55C without the fan on.
Overall, I would say that it was successful.

Fan is still as loud as ever but I may go back into the machine and put an in-line ceramic resistor on the 5V line.

 

I use this one http://www.newegg.com/Product/Product.a ... 6835118220 no filing, fits perfectly

 

It would be really nice to know how the sound from the fan changes with an in-line ceramic resistor, so if somebody does it, please post info about the result!

 

Hi matrix. Thanks for those measurements. Did you use a thermal adhesive or tape to attach it?