Mount a P4 IHS on your Dothan!!! Protect the core!

[charlie]

So here it is... thx to a fellow XS member I have a spare P4-IHS from a 1.6 Willamette.

When you first plop it on top of the Dothan core, you see the IHS floats above the pcb maybe 1mm. So I looked at how Intel does it. They put a bead of black silicone (rtv) around the base of the IHS. I believe that Intel uses a press to install the IHS to the core of their P4. After a few hours the press releases the CPU. The thermal paste is well "squished" between the IHS and the core and the IHS adheres to the pcb with the silicone stuff.

So I did the best I could, using a 3 pound brick of copper to be my "press".

Here's the project:


Here's the bottom of the IHS stuck to the heatsink after testing for contact...BINGO!


and here's the finished product... I could have taken a qtip and smoothed the silicone so it was "prettier" but I just wanted it "square" and level...


now I'm just gonna let it cure overnight with the weight still on:

[illmatik]

Quote:
Originally Posted by charlie
here's the problem... if you make a IHS that fits on core and rests on the pcb, what about the TIN on the core, that takes up a little space, too. RTV is simply black silicone from a hdwe store. I will start a thread of "how-to"!

C

Yeah, thats what I mean, how to machine it to have just enough slack to account for the intel coating and its sloppy drip over. You think a .9mm notch height wise in 2.5mm silver stock should cover it as well as a .1mm around to account for the intel tin would do it. I figure a bead of ceramique around the perimeter should fill in the core notch.. If I make the core notch w/ room to spare over spec measurements and a perfectly flat base that can be coated w/ tim as well to seal from the atmosphere, what kind of condensation risks are there, or should I really be more worry about good core contact this point?

[charlie]

Quote:
Originally Posted by charlie
here's the problem... if you make a IHS that fits on core and rests on the pcb, what about the TIN on the core, that takes up a little space, too. RTV is simply black silicone from a hdwe store. I will start a thread of "how-to"!

C

Yeah, thats what I mean, how to machine it to have just enough slack to account for the intel coating and its sloppy drip over. You think a .9mm notch height wise in 2.5mm silver stock should cover it as well as a .1mm around to account for the intel tin would do it. I figure a bead of ceramique around the perimeter should fill in the core notch.. If I make the core notch w/ room to spare over spec measurements and a perfectly flat base that can be coated w/ tim as well to seal from the atmosphere, what kind of condensation risks are there, or should I really be more worry about good core contact this point?

Yeah, that'd be nice... if it rested on the pcb and had room for a VERY THIN coat of AS5 on top of the core under the IHS. You'll need to mess with different machined parts until you find the one that works the best. Or just get a P4 IHS



C

[charlie]

will youre stuff hold @ subzero temps?
anyways nice done..looks smooth

Sure, it's just a copy of what Intel does... it SHOULD behave just like a P4 under phase change.

C

[Nasgul]

Are you going to cover the breathing hole? just to make sure no condensation is build inside the heat-spreader?

[illmatik]

Yeah, that'd be nice... if it rested on the pcb and had room for a VERY THIN coat of AS5 on top of the core under the IHS.

BINGO! That exactly what I'm trying to do!! I want the rest of the IHS to be perfectly flat against the core so that theres a single source of pressure on the core rather than using force to attach the IHS to the processor pcb.

You'll need to mess with different machined parts until you find the one that works the best. Or just get a P4 IHS

Yeah I'm going to start by modding the intel IHSs and a piece of copper cold plate I have that will be split. If I can find a method that can be consistently reproduced, I might as well have a go with silver

[death metal]

Woah........nice pics. Thanks a whole bunch for the tip! Sorry for my OT posts on the Dothan mystery thread. This one is great. And that metal block is scary. If it tips over, I think you can crush the whole set up!!!

Thanks to Nohto as well about clarifying what RTV is ....keep this discussion and ideas flowing guys...

[ibby]

how does this help overclocking apart from you wont crush the core with this ...

[jrw]

How are the pins on the CT-479 doing under that brick?!

Nice work, and awsome "trick"!

Thank you Mr charlie...

[craig588]

Why didn't you lap the inside and top of it? Tin is not a good conductor.

[Unseen]

i have done the same to my dothan. Nice charlie.

[brandinb]

I have to say the more i watch it the more i like it..yet i'm having a strong feeling to play the sadist
Would an FX hsp fit on it?That way i can writ in small same letters owned on it

lol nice
________
Vaporizer

[charlie]

no, A64 IHS are HUGE!!

[charlie]

How are the pins on the CT-479 doing under that brick?!

Nice work, and awsome "trick"!

Thank you Mr charlie...

I was thinking the SAME thing!!

But I figured that 3 pounds is about 1500 grams... and the ct-479 has 478 pins...
1500/478 = 3.13 Grams pressure per pin.

C

[Raiden Zero]

Are you going to cover the breathing hole? just to make sure no condensation is build inside the heat-spreader?

good question...
answear(s)?^^

@topic: i'll do the same with my 760, too.

[[XC] moddolicous]

Nice idea Charlie. This should allow more people to mount casades and tighten down LN2 tudes down for better heat transfer. Too bad no one did this for AXP. Would have saved people a ton of chips.

[JSU]

So um neone selling p4 heat spreaders?

[STEvil]

Why didn't you lap the inside and top of it? Tin is not a good conductor.

would need to mill the base to do so, the base has a step all the way around it. A64's also have this "feature"

[charlie]

After having a IHS on my Dothan for a week here's what I've noticed:
The cpu idles about 2-3C warmer than without a IHS... but under load it runs 2-3C COOLER than naked... this can only be explained by the fact that it is making better contact now than before when naked. Plus my CPU already has 3 small pits and 4 or 5 hairline fractures on the core, ONE MORE heatsink mount may have been the "end" for my Dothan... this mod is a "lifesaver"

C

[runmc]

Very impressive work Charlie. I'm glad you "Saved the Dothan". (Dolphin) LOL

[Unseen]

take a look my hs.

A friend(eleven) with his cnc did it.





The die is 0,82.
The hs is 0,62 so 0,2 difference.

[freecableguy]

Now... that CNC'ed IHS is cool....

[Always]

Awesome work, and copper made, I gues no problems now mounting whatever cooling you want to put on it.

Kudos to eleven for the awesome work.

[charlie]

nice...

[Waus-mod]

Thats a really pretty job charlie.. Did you used Liquid electrical tape to mount the ihs on the dothan's pcb?