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Q6600 - Lapping turned out a little wrong

 
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fluidz
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Joined: Aug 29, 2007
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Location: Birmingham Uk

PostPosted: Mon May 25, 2009 7:31 pm    Post subject: Q6600 - Lapping turned out a little wrong Reply with quote

Hi, ive just lapped my q6600 G0 cpu, but the edges have been sanded more than the centre. I need to know, whats the safest amount of sanding i can do? As theres not much left for me to sand before the copper has completely gone!

I tried it in the pc, using a Silent Knight 2 hsf, and a very thin layer of Akasa 450 silver paste to find the temps at 49c idle and 75c load! And that was only after 2 minutes.

I applied a little pressure to the hsf to see if the uneven surface of the cpu was causing a lack of contact, and yes it is. Applying pressure to one side of the hsf, pushing towards the motherboard, cools down 2 of the cores, out of the 4, but heats up the other 2. This is because the centre of the cpu is slightly higher than the sides.

I've been using basic medium strength sandpaper. What sould i use to equal the surface out?

Please take a look at the pics.

http://img200.imageshack.us/img200/4233/26052009163.jpg

http://img34.imageshack.us/img34/8003/26052009161.jpg

Thankyou
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GOZ
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PostPosted: Mon May 25, 2009 9:47 pm    Post subject: Re: Q6600 - Lapping turned out a little wrong Reply with quote

fluidz wrote:
Hi, ive just lapped my q6600 G0 cpu, but the edges have been sanded more than the centre. I need to know, whats the safest amount of sanding i can do? As theres not much left for me to sand before the copper has completely gone!

I tried it in the pc, using a Silent Knight 2 hsf, and a very thin layer of Akasa 450 silver paste to find the temps at 49c idle and 75c load! And that was only after 2 minutes.

I applied a little pressure to the hsf to see if the uneven surface of the cpu was causing a lack of contact, and yes it is. Applying pressure to one side of the hsf, pushing towards the motherboard, cools down 2 of the cores, out of the 4, but heats up the other 2. This is because the centre of the cpu is slightly higher than the sides.

I've been using basic medium strength sandpaper. What sould i use to equal the surface out?

Please take a look at the pics.

http://img200.imageshack.us/img200/4233/26052009163.jpg

http://img34.imageshack.us/img34/8003/26052009161.jpg

Thankyou


umm where you using a piece of glass and tapeing the sandpaper down on it?

If not there is your prob

http://forums.legitreviews.com/about10444.html
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Last edited by GOZ on Mon May 25, 2009 10:02 pm; edited 1 time in total
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ClutchCargo
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Joined: Dec 10, 2007
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PostPosted: Mon May 25, 2009 10:00 pm    Post subject: Reply with quote

I use a fresh razor blade to check flatness
ie; place edge across cpu with a light source behind it


and some over the top links

lapped my Q6600 (pics and results)Arrow
My Q6600 lapping experience with tons of PiCs!Arrow
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Radical_53
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Joined: Aug 24, 2007
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PostPosted: Thu Jul 30, 2009 12:37 pm    Post subject: Reply with quote

What Goz said is right, also it seems you used too rough sanding paper. Normally you'd want to use wet sanding paper, something that starts at 600 grit or even higher.
The other thing is the flatness of your hsf. Many "modern" heatsinks adopted to non existant flatness of the IHS to get a better contact. So some heatsinks will require you to lap them also after you finish the CPU IHS.
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Frames
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Joined: Mar 29, 2008
Posts: 482
Location: West Michigan

PostPosted: Thu Jul 30, 2009 9:47 pm    Post subject: Reply with quote

Um yeah. When done correctly, you should have almost a mirror finish on the heatspreader. Yours looks...well...sanded. And the problem is, with all those tiny little grooves in the spreader, you're more than likely getting some air bubbles trapped, not to mention, you said its uneven. Thats rough...no pun intended.
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