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A Couple Of Lapping Questions

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Steve The Egg

Registered
Joined
Dec 12, 2007
I have a TRUE 120 and a Q6600.
I know I'm going to lap my TRUE 120, but I'm still undecided if I should lap the CPU too.


Also, should I get anymore grits?
What I have:
320
400
600
1000
2000
 

Hazaro

Member
Joined
Apr 25, 2007
2000 is excessive imo.

Do a razor test on both, chances are the CPU is way worse than the TRUE.
 

Spawn-Inc

Member
Joined
Jun 13, 2007
go with 2k or even 2500 IMO. i would also start out with 400. don't bother with the 320.

take the sheet of glass you have for the lapping and put a couple of drops of ink or food colouring or some kind of coloured liquid and put the cpu against it and you can see how flat it is. the darker the colour means there is a valley and the lighter the colour means its right up against the glass and therefore flat.
 

ancalime

Member
Joined
Mar 26, 2007
2500? Wow unless you want to spend a whole day scraping metal off your CPU I would not waste my time.

Going to such high grits gives you no gain in performance and some have argued that it can actually hurt performance since there will be no place for the particles in your thermal compound to rest. I usually only do 400 and 600, 800 only when I am bored.
 
OP
S

Steve The Egg

Registered
Joined
Dec 12, 2007
2500? Wow unless you want to spend a whole day scraping metal off your CPU I would not waste my time.

Going to such high grits gives you no gain in performance and some have argued that it can actually hurt performance since there will be no place for the particles in your thermal compound to rest. I usually only do 400 and 600, 800 only when I am bored.

I will probably only go up to 1000. I've heard varying numbers here. How many degrees willy his shave off my temps. I'm looking for about 5-10C so I can bump up my oc from 3.5 to 3.6-3.7
 

Hazaro

Member
Joined
Apr 25, 2007
I will probably only go up to 1000. I've heard varying numbers here. How many degrees willy his shave off my temps. I'm looking for about 5-10C so I can bump up my oc from 3.5 to 3.6-3.7

Depends how bad it was previously.

Start at ~200 imo, you want to get all the covering off the CPU first, my E6600 took me 45 minutes to get all copper with 220 grit... :mad:
 

Spawn-Inc

Member
Joined
Jun 13, 2007
Depends how bad it was previously.

Start at ~200 imo, you want to get all the covering off the CPU first, my E6600 took me 45 minutes to get all copper with 220 grit... :mad:

45 minutes??????????

are you pushing the cpu across the sand paper? it takes me all of 15-30 minutes to get a mirror shine from start to finish. i think with my celeron it only took me 2 minutes to start to see copper.

the only reason i even did 2500 was because i had it but now i only have up to 1500, so i stop there now a days.
 

Sam__

Member
Joined
Mar 12, 2007
Location
UK
I did my E6300 with 220 400 600 800 1000...took about an hour total.
shaved a few degrees off. i doubt u will get 5-10c unless its like a bowl or tophat lol.
 

Same

Member
Joined
Aug 11, 2006
Location
Maryland, US
not to hi-jack the thread but I have a lapping question myself. Do you use wet/dry sandpaper, or wet abrasive, or what? i've seen abunch of different kinds.
 

Spawn-Inc

Member
Joined
Jun 13, 2007
i used dry sanding for the 500 grit i start out with then once the paper gets full of metal and such i spray it with a sprayer. from then on it's all wet. i also used automotive wet/dry sandpaper.
 
OP
S

Steve The Egg

Registered
Joined
Dec 12, 2007
Circular motions??? or straight then rotate???
How should I do this. I've heard conflicting ways but I want toms direct advice. :D
 

moto211

Member
Joined
Jan 4, 2008
Location
Sacramento, CA
strait, counting strokes, then rotate 90 degrees and do the same number of strokes, continue until desired result is achieved. try to use light and even pressure. if your not totally even, its o.k., that's why you turn it.
 

Red_LightRanger

Member
Joined
Jul 10, 2006
steve make sure you test your true BEFORE you lap. WHat kind of temps are you getting now?? I made the mistake of lapping before i tested it and the temps werent that good. I wanted a replacement from thermalright, but they said it was my fault and the temps were bad because i lapped it, not because it couldve been bad to begin with.
 

Spawn-Inc

Member
Joined
Jun 13, 2007
i will do circles at the lowest grit until the copper is showing. then i do back and forth until smooth.
 
OP
S

Steve The Egg

Registered
Joined
Dec 12, 2007
When I lap the CPU is there anyway I can sand it to far? How do I know when I go too far? Circles? Lines? Starting Grit? Warranty? Am I ok to took the pins on the bottom? Do I need gloves? Thanks in advance guys. You are awesome.
 

Hazaro

Member
Joined
Apr 25, 2007
45 minutes??????????

are you pushing the cpu across the sand paper? it takes me all of 15-30 minutes to get a mirror shine from start to finish. i think with my celeron it only took me 2 minutes to start to see copper.

the only reason i even did 2500 was because i had it but now i only have up to 1500, so i stop there now a days.

It was pretty bad...

not to highjack the thread, i have started to consider lapping my cpu. what should i use to protect the cpu?

Little black plastic clip thing that came with retail HSF if you have it.
 

NettieZoom

Member
Joined
Sep 24, 2006
Location
The Boonies
I went on a lapping spree a few months back, I lapped my X2 5200+, 3700+ and my C2D 6600, to be honest it was not worth it except for the 6600 as it was the only one that was not flat to begin with, on the others I maybe saw a 1C change lol. Now on the 6600 I saw a good 3-4C change but it is only because it was really warped.

I wouldnt bother with the CPU unless it is really bad.