L702x mod possible?

Hi there folks,
I had an idea but the problem is i am not certain on some points of the idea.
The general concept is to start a mod on the L702x for cooling and the idea grew from lowering the temps to superb cooling.
So i would like some help before i venture on this journey

First thing i will start is to change the fan of the Dell and here is the first question?

I got a replacement original fan and its stated at 5v 0.5amps, its size is 60mm and gives out 10cfm - and as you know its round with straight blades. I have do the math and think to change if with 70mm fan with normal blades - found even one (evercool 5v 0.3amps - 25CFM!). And here comes the kicker...what will be the problem if i change the type of fan from straight blades to normal - will it direct the airflow in the enclosure towards the heatsink if all the holes (except the intake) are sealed?

Help guys so i could continue on the venture

Cheers

 

Curved fans usually moves a larger amount of air than straight ones, but in an other direction. You could try, but be careful!

 

The fan was a small success - success but small Didn't like the sound of it, though there was a 5C drop.
I have now think on making the oem cooling more effective and find a way to cool down the palmrest as i don't like it when it gets too hot... Continue work on the project to mod the Dell

 

Great thread and congrats on your swap. I will be waiting for more of your mod ideas. Subscribed

 

Long time no see

Had a lot of work, but now i'm back and getting ready for modding the cooling

The stages that i will go through will be three at start :

Stage 1: Will modify the fan and add "a modded" radiator as an extend to the current ones.
Stage 2: Will add a "new" heatsink to the other side of the GPU below the palmrest
Stage 3: Will add a modded heatpipe from the new heatsink to the radiators
Stage 4: This will be decided in the process as i might decide to cut additional ventilation holes on the palmrest and the bottom chassis.

 

Stage 1:

Here is the beginning of the process - got myself a couple of copper sheets with thickness of 0.5 and 0.3 mm. The Small one will be used for the fan modding as i want to use the same mounting like the normal fan, the 0.5 sheet will be used in stage 2 for the GPU heatsink.

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The next think on the list are ram heatsinks - lots of them, for the moment i gathered 32 pieces - and according to the schemes i will use around 28.

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I have made calculations how the fan should look like and cut the cooper using a template ...

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Later i will post the schematics for the design and the ongoing process of creating a heatsink and adding the fins for the radiator.

 

Here are some pictures of the mod for stage 1 =>


And making the model for the fan cover


And using the phobya thermal glue



And getting ready for the replacement


And the replaced cover with applying MX-2 for contacting the existing radiator



And the final placement as the copper heatsinks had to be moved a bit as the lid didn't close



For testing its more than great for as the temperatures have fallen with almost 8-10 degrees.
The GPU is around 72-75 with OC hoping to reduce this more with the next stage upgrade.


And the CPU is around 85C during Prime95 Blend

 

Very nice!

I have a similar mod on my laptops, and it also considerably lowered my temps. I found that the key is making sure the copper sheet has *good* contact with the original heatsink, otherwise the heat transfer is not as effective.

Also, you might want to consider redoing it (if you've got time :-D) with a drilled copper sheet, so it is cooled by the fan, as well. I've attached a picture of my mod to show you what I mean.

The copper sheet is right in front of the fan, so cold air goes through it before going through the heatsink = maximum air cooling efficiency.

 

Doesn't it reduce the airflow this way? I was think of doing a mesh like copper sheet but I had doubts that i may interrupt the airflow too much. I will redo it again soon as i will be upgrading it

 

Not if the holes are large enough - the air would pass through as normal, while cooling the copper sheet at the same time. The colder the copper sheet, the more heat will be transferred from the original heatsink and as a result it will cool faster.

 

Hmm, you got point I will make a new sink with holes i will post a design here for review and suggestions

 

I think yours is already great, I wanted to replace the fan's enclosure with copper, too, but it was too difficult. Drilling holes is for version 2 of the mod

 

Happy new year guys (& girls )
And back for stage 2 of the mod - had to make a small change in the 1st stage as the copper sheet didn't have a good contact with the radiator and with time it moved. And for the stage 2 i mounted a new heatsink, but everything will be explained tomorrow with the uploding of the photos

 

A little update cause i had to redo the cooler a bit
Here are the new ram thermal pads for the palmrest of the gpu.


The motherboard with the pads



And finally the heatsink



Now after some tests - no matter what i throw at the CPU, the GPU stays ice-cold
The combined performance is more than enjoyable as the CPU doesn't pass 80 degrees and the GPU stays below 70

 

Excellent work!

 

Prime95 + Furmark? Thats hell of a mod if it can do that under maxxxed load.

 

The cold weather is to blame for those results - now as the heat returns the temps are a bit different but real - Prime95 + Furmark - CPU 90c and GPU is around 74c, which i think is again good result, though i will look into the mod and revise it for better results.

 

Not bad on the GPU, but the CPU is still high for me. That system really needs a second fan...

 

Yeah the GPU is great considering that this is with OC at 680Mhz and Mem@ 920, but the CPU really needs a second fan - which I wonder how to mod and put in. This should be a next stage of the mod.

 

The pin is easy, you just have to find space, and appropriate fan. I'm rocking two fan setup now