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AMD Lapping Question.

post #1 of 12
Thread Starter 
Hey guys, I just lapped my AMD. Took me about 4 and a half hours to do it. I used 600/800/1000/1200/2000 sandpaper. Then I polished it with brass polish...I don't think the term "mirror" defines how shiny this baby is
I polished my Zalman afterwards aswell. The problem I have now is that my 2 cores used to be about 3 degrees difference between eachother, now its a whopping 7! How the heck it that possible? What does it mean? The overall CPU temp dropped about 5 degrees, but now core 2 runs much hotter than #1. Is the temp diff a big issue when overclocking? Any advice would be greatly appreciated.

Thanks.
    
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post #2 of 12
are you absolutely 100% sure you lapped on a 100% flat surface?

If so, then it might have been that before lapping core #2 had better contact with the heatsink than core #1...
    
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post #3 of 12
as chozart said that could be the issue.

or your zalman is not 100% flat either its a slight chance but you never know..

or your thermal might not have equally spread even on both cores giving a difference in the temps..

which method are you using for applying the thermal?
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post #4 of 12
Thread Starter 
Yes I'm sure, flat as it can be. I'm using AS5 and the method of application on their website for my CPU. One dot in the middle....
    
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post #5 of 12
Try to spread it manually with a gloved finger or a plastic stick instead.
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post #6 of 12
Also make sure that your heatsink is squarely in the middle of your CPU.
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post #7 of 12
Thread Starter 
I've just re-seated the CPU....the paste was quite off center. I re-applied the AS5 and used a little bit more this time. Funny enough the temps are still the same. But I'm not gona stress any longer, I will wait for the AS5 to settle in a bit. I will reply as soon as I see a difference. Thanks for all the replies guys!
    
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post #8 of 12
Quote:
Originally Posted by Stalker View Post
Took me about 4 and a half hours to do it. I used 600/800/1000/1200/2000 sandpaper. Then I polished it with brass polish...
I don't think you are supposed to "polish" it with metal polishes. It is supposed to shine because the grain of the wet+dry was so fine.

It can interfere with the thermal paste.
post #9 of 12


Since you used Brasso, you may want to use a xylene-based cleaner or alcohol (isopropyl) to remove the residue. Polishes and scented cleaners can leave behind particles that may inhibit the thermal transfer.
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post #10 of 12
I hope that by polish you dont mean you actually coated it with a polishing substace?

Also, for the difference in temps, make sure you screw in all the screws evenly. If you aren't using screws, while your PC is running, apply more pressure to it and see if your temps improve. If they do, it means that, by lapping, you removed enough metal to make the contact less tight, and you will need to do a little pressure mod. I'm not familiar with how the Zalman's mount, though.
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