Death by lapping

Mr-White · 28 Jun 2009 at 14:44

I've just finished lapping my Q9550 when I turned it back on and for a longer period than normal I was faced with a black screen. Crapping my pants I fiddled with the gfx connector and finally saw the login screen. Which then got me thinking.

Has anyone killed a cpu by lapping it ?

MW

Jokester · 28 Jun 2009 at 14:45

Not here, done a few as well.

setter · 28 Jun 2009 at 14:50

Nope, i lapped my previous q6600 without issue, certainly made a vast difference to temps, considering lapping my current q9550 to try and even/lower the temps a bit.

JonJ678 · 28 Jun 2009 at 14:51

One lapped, no casualties yet. I'll lap the next one I think.

If someone has killed one, could you specify whether you used water/oil with the wet and dry paper or not please

Angst · 28 Jun 2009 at 14:53

im guilty, lapped a p4 for a friend and bent one of its pins. i tried bendin back gently but it just came off.

reflux · 28 Jun 2009 at 14:54

Lapped my Q9450 and it wouldn't boot. Took the whole thing apart, dusted out the socket and gave the CPU a good wipe down, and it worked. I'm guessing I got some metal dust in the socket or something.

Mr-White · 28 Jun 2009 at 14:56

I've lapped 3-4 now, have done them all the same way using water and wet & dry 120 to 1500 grit. Although i've noticed my previous cpus that the edges were the first to start wearing away where as the Q9550 the edges were the last. Dunno if it's a different manufacturing process but I'd imagine the heat spreaders don't change ?

MW

Jokester · 28 Jun 2009 at 14:57

The heat spreaders are defintiely better now than they used to be, there's little to be gained from lapping on current CPUs.

Mr-White · 28 Jun 2009 at 14:57

phill0i said:
im guilty, lapped a p4 for a friend and bent one of its pins. i tried bendin back gently but it just came off.

I've only lapped one with pins that was my AMD 939 winchester dual core

MW

MikeHunt79 · 28 Jun 2009 at 14:59

I used a orbital sander on an old Athlon 64, it still worked after!

Geekazoid · 28 Jun 2009 at 15:00

???

is lapping actually worth it? do you get a drop in temps significant enough to carry out the procedure? also did u guys lapp your heatsinks also with the cpu??

i was thinking of lapping my true but not the 920cpu cos its new and i dont want to loose my warranty...

Mr-White · 28 Jun 2009 at 15:14

I always lap the heatsink.

I saw around a 15'c drop from an unlapped e6600 and heatisnk in a full case to a lapped heasink and cpu in a shuttle

MW

setter · 28 Jun 2009 at 15:18

Geekazoid said:
is lapping actually worth it? do you get a drop in temps significant enough to carry out the procedure? also did u guys lapp your heatsinks also with the cpu??

i was thinking of lapping my true but not the 920cpu cos its new and i dont want to loose my warranty...

I dropped the temps on my old q6600 at 3.8ghz from 81-81-72-72 down to 68-68-62-62, both cpu and TRUE black lapped to 2000 grit.

Geekazoid · 28 Jun 2009 at 15:59

....

man those temps are good tempting me but i will have to wait till my warranty expires lol...

OrphanBoy · 28 Jun 2009 at 22:29

Silly question, but why's it called 'lapping'?

Mr-White · 28 Jun 2009 at 22:37

lapping

MW

Ducky Spud · 28 Jun 2009 at 22:44

OrphanBoy said:
Silly question, but why's it called 'lapping'?

haha, I'd never thought of that but good question! Anyways, we now know

Ive never lapped any CPUs. Replacing my E8400 with an E8500 (mines a C0 and needs lots of volts to overclock) so may lap that when it comes... we'll see how Im feeling

EDIT: no I wont, got a lapping kit (basically all the different sandpapers) but its at uni lol

mollymoo · 29 Jun 2009 at 09:26

I lapped mine then prayed I'd never need the warranty

all worth it though dropped about 10c off my temps

CK61938 · 29 Jun 2009 at 11:32

I was brave and dived in and lapped my Core i7 920 D0...cos the temps I was getting when using a CPU Cooler (TRUE and Noctua) were horrendous. I have since gone H20 and the temps are much much better

to the point of where I was able to push my CPU to as high as 4.5GHz.

I have a Q6600 currently in use that idles at 38C...might decide to lap it one day...but not sure when...and I have a AMD 6000 X2 doing bugger all...I may lap that...