Lapping risks

Hen_Dawg · 18 Jan 2008 at 15:05

Wizardskills said:
I made a thread on how i lapped my heat sink. It it a worth while thing to do as it knocked off arround 10*C from my stock load temps

http://forums.overclockers.co.uk/showthread.php?t=17828336

CPU lapping is a bit more risky and i would only do it if the temps were getting high after lapping the heat sink

Thanks a bunch

Pneumonic · 18 Jan 2008 at 15:30

the only risk whilst lapping I guess would be that you lap unevenly, but if you follow one of the numerous guides that are about should be fine!

Stelly · 18 Jan 2008 at 15:47

Mine is lapped was worried, but ended up good

Stelly

homi-sid-al · 18 Jan 2008 at 19:38

Pneumonic said:
the only risk whilst lapping I guess would be that you lap unevenly, but if you follow one of the numerous guides that are about should be fine!

your more at risk of getting an uneven surfice if you lap in a circular motion,if you do lap in a circular motion you should try to keep yourself above the proccessor as you lap if that makes sence,the best way to do it is to do it in a forward backwards motion turning the cpu every so often allso resting your fingers on the side of the cpu not applying any pressure and you'll get a nice finnish.One tip you probably wont find on any guides is keep your fingers well away from the paper,before you realise you can give yourself one hell of a friction burn :mad:

ill never do that again

Pneumonic · 18 Jan 2008 at 19:58

homi-sid-al said:
your more at risk of getting an uneven surfice if you lap in a circular motion,if you do lap in a circular motion you should try to keep yourself above the proccessor as you lap if that makes sence,the best way to do it is to do it in a forward backwards motion turning the cpu every so often allso resting your fingers on the side of the cpu not applying any pressure and you'll get a nice finnish.One tip you probably wont find on any guides is keep your fingers well away from the paper,before you realise you can give yourself one hell of a friction burnill never do that again

Haha yes first time I lapped a CPU I also lost all the finger prints on some of my finger tips

scook94 · 18 Jan 2008 at 20:05

I understand it's possible to buy ready made kits, if you are going to lap both the cpu and the heatsink, will one kit be enough or would it be best to get 2?

Big.Wayne · 18 Jan 2008 at 20:59

scook94 said:
I understand it's possible to buy ready made kits

I wouldn't bother buying a kit when all you need is a few sheets of wet & dry sandpaper available at any hardware store for about 0.30p each sheet.

Lapping isn't rocket science, its just carefully and gently sanding down some metal so its surface is flat and even, take 5-10 minutes and job done.

scook94 · 18 Jan 2008 at 21:10

Ok cool, so you don't need all the grades down to 10 micron then? What grades would you recommend?

steve258 · 18 Jan 2008 at 21:23

Bubo said:
Hang on, pinless cpus? I have an AMD 4400X2 and it has pins, I've thought about lapping this but always wondered how to hold it without risking bending pins. Are you saying that new cpus, i.e. penryns, q6600 etc, don't have any pins?

Not just penryn and q6600 but every CPU ever released on LGA775 (1st is Pentium 4 520 2.8Ghz)

Have ordered a premium lapping kit that comes with:

400
600
800
1000
40micron
25micron
20micron
15micron
10micron

as well as Arctic Silver Ceramique and even a pane of glass, will see how I get on.

Pneumonic · 18 Jan 2008 at 21:38

steve258 said:
Not just penryn and q6600 but every CPU ever released on LGA775 (1st is Pentium 4 520 2.8Ghz)

Have ordered a premium lapping kit that comes with:

400
600
800
1000
40micron
25micron
20micron
15micron
10micron

as well as Arctic Silver Ceramique and even a pane of glass, will see how I get on.

someone knows a certain scots man

same kit I use

scook94 · 19 Jan 2008 at 21:46

Big.Wayne said:
I wouldn't bother buying a kit when all you need is a few sheets of wet & dry sandpaper available at any hardware store for about 0.30p each sheet.

Lapping isn't rocket science, its just carefully and gently sanding down some metal so its surface is flat and even, take 5-10 minutes and job done.

Picked up various grades of paper today from Halfords and had a go at lapping both my CPU and heatsink. Didn't quite get the mirror finish I've seen on others, but that's just done to my lack of patience. Temps look ok, nothing drastic, maybe a couple of degrees lower on full load, will have to wait fort he new AS5 to settle before I mark it down as a success or not.

But, hey, at least my PC still works!

homi-sid-al · 19 Jan 2008 at 22:05

scook94 said:
Picked up various grades of paper today from Halfords and had a go at lapping both my CPU and heatsink. Didn't quite get the mirror finish I've seen on others, but that's just done to my lack of patience. Temps look ok, nothing drastic, maybe a couple of degrees lower on full load, will have to wait fort he new AS5 to settle before I mark it down as a success or not.

But, hey, at least my PC still works!

you dont need the mirrored finnish aslong as its flat,BTW hows the fingers?

scook94 · 19 Jan 2008 at 22:13

They're fine, made sure I didn't lap them in the process too!

steve258 · 20 Jan 2008 at 00:16

Yeah to get the mirror finish you'll also need the metal polisher as well.

Richie P · 20 Jan 2008 at 09:13

I wouldn't use any sort of polish after lapping, you're only adding another compound between the IHS and HS wont help temps. It may look pretty, but it's ultimately pointless.

As for lapping, as long as you use a flat pane of glass, circular or up+down wont make an difference. Both will be perfectly flat.

5C drop from lapping here (my old Xeon 3060), but my chip was pretty good temp wise to start with. Ended up with sub-50C load temps for 3.6Ghz