Lapping a laptop CPU

I would like to know your thoughts on this.

Is it a good idea, as a laptop tends to run hotter than a desktop.

Or is there some underlying difference in a laptop cpu and a desktop cpu that I don't not that would effect whether you could lap it or not.

I have see a laptop cpu for sale on ebay that looked as if it had been lapped, it had a silver mirror finish.

 

All modern Intel laptop CPUs look like that (at least Pentium M on). It is NOT lapped and I would advise against doing it on this type of CPU... You will not get a smother surface than the silicon that is visible.

 

I have lapped "laptop" CPUs in the past. If you know what you're doing and are careful and only remove just what you need you "should" be ok. The major difference as far as you are concerned in this post would be that "desktop" CPUs have a heat spreader applied on top of the die as opposed to a "laptop" CPUs die being exposed for all the world to see. If you lap to much you run the risk of DEADing your CPU. I have to ask, is your CPU really that "uneven" as to require lapping?

 

My biggest problem is that I put in a new T7500 and I'm getting temps up to 81C when I'm converting a movie and pushing the cpu. I reused the old heat compound I know but I didn't have any new at the time I now have some and going to redo it. I hope this will help.

 

There's your problem. I have found that the thermal compound that manufacturers use is second rate stuff anyway, and then you committed the cardinal sin of reusing the stuff. You should see a MUCH more significant decrease if you go out and replace that stuff.

Edit:

Remember K*I*S*S. Replacing the thermal compound is a much simpler procedure than lapping (and potentially destroying) a cpu. In overclocking forums typically you are seeing a 1-2c drop in temp from lapping, decent thermal compound on the other hand produces a 4-5c difference in temps on the laptops that I have used it on.

 

thats not bad man, the old t series is a little hot.

mine went over 90 all the time.

 

If it was lapped it would actually be pretty dull. You do need to replace the thermal paste if you want to see decent temps.

 

I Agree with all said here. Dooode. Ya gots ta use NEW HS compound.