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so i bought a True from crazypc with their lapping service...

1358 Views 24 Replies 14 Participants Last post by  BADFASTBUSA
What i am wondering is if i need to lap my amd 940 cpu as well? and how much thermal paste should i use if they are both lapped?

I just bought the amd 940 so i really hate to void the warrantee, but if it is going to help that much with cooling, so be it. Have you guys that have lapped the 940 noticed that it wasn't very flat from the factory or do they come pretty flat?

Lastly, i am using ocz freeze thermal paste, and am wondering how much better my cooling would be after lapping the cpu to match my lapped TRUE than with the noctua? Noctua fans in push pull is being used now and will be used on the true as well, but i might opt for some better fans like a sans ace or panflo or something to that effect.
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you dont need to lap your cpu. Lapping it may drop temps 3-5C but u can have a lapped hsf and an unlapped cpu. Just put a drop of thermal paste on the cpu and put the hsf on, the weight of the hsf will spread it evenly. your lapped True>noctua
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i actually just got threw watching both of those vids on youtube right before making this post LOL, but +rep for hooking me up with an easy way to find them when i go for it.
Quote:


Originally Posted by sgdude
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you dont need to lap your cpu. Lapping it may drop temps 3-5C but u can have a lapped hsf and an unlapped cpu. Just put a drop of thermal paste on the cpu and put the hsf on, the weight of the hsf will spread it evenly. your lapped True>noctua

so i will still get some decent temps even if i don't lapp my cpu with a lapped true?
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yuppers, lapping both is a bit overkill if you dont need the 2c difference. Plus its ALOT less expensive if you mess up lapping your TRUE than a CPU, lol! Good Luck! And happy lapping!
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Quote:


Originally Posted by BADFASTBUSA
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so i will still get some decent temps even if i don't lapp my cpu with a lapped true?

You shoud do fine.

Hold the CPU on the inverted HS and hold it up to a light to see if any areas show light through to detect a good mating of the IHS to the HS.
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yes, the thermal difference will be minimal. And trust me a few degrees more usually doesn't mather at all. I had to rma my cpu a few months after using it, and i'm so glad i did not lap it. Also if you want to sell it to someone later on, the fact that it's lapped will make it loose some value.
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I've lapped 2 940's so far

Both were High on the outside and High in the middle.

Then around the center there were 4 spots all lower than each other (towards the Corners)

weirdest pattern i have ever seen on a AMD lol

Anyways here's an Idle pic @3.9ghz (Lapped True/CPU+ Scythe Ultra Kaze (3000rpm) ambient temp 70F

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Lapping the CPUs IHS can give you a lower temps but if it is not bad it will be minimal. I have seen some that were terrible and benefited greatly from it. If you do lap you can use even less paste but as said if you are worried about the warranty don't do it.
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Quote:


Originally Posted by gablain
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yes, the thermal difference will be minimal. And trust me a few degrees more usually doesn't mather at all. I had to rma my cpu a few months after using it, and i'm so glad i did not lap it. Also if you want to sell it to someone later on, the fact that it's lapped will make it loose some value.


Not necessarily true, some people live to get that few extra degrees and some will gladly pay the going price for a nicely lapped CPU.
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A good lapping does not decrease value.

Very, very few CPUs just die out of the blue, so unless it was DOA, the loss of the warranty is a total non-issue.
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well personnaly, i would pay less for a lapped cpu, since i would not have any guarantee, and it most certainly have been overclocked.
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Quote:

Originally Posted by BADFASTBUSA View Post
so i will still get some decent temps even if i don't lapp my cpu with a lapped true?
Yep, and not lose your 3 year warranty, too.

A proc doesn't have much copper to correct from mistakes, either.
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I hate to be a bubble buster but take down all the numbers off the top of you CPU and Lap it. My 9950 had a Mountain in the middle of it. I lapped it and got 5 degrees Celcius out of it. The thing you need to remember is Start with the 600 grit and dont go to the next grit until all the silver is gone off the top. The 800.1000,1500. 2000 for that killer shine.
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Only lap if your not afraid and don't care about the warranty.

I can tell you AM2 and AM2+ (Phenom and Phenom II 940's) have alot of material... it is not thin at all.

If you wanted to...

You seriously can Sand over half the height of the IHS and still have more material. I know this because I have done it twice.
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Use the clear plastic bottom of the cpu case as well as the black foam that came under the cpu as the handle. Take pictures of the top of the processor for records. And I gave my 9950 to my son and he is using it now that i have my 940. He didn't care about it being lapped. He knew what he was getting.
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I know I sound like a sissy, but personally, I would never lap my primary CPU. Ironically, I've never had a CPU just die, so I've never had to worry about the warranty.

BUT what does worry me is messing something up during the lapping process--then you're SOL.

I do plan on lapping my 2180 if I don't sell it the next time I upgrade, but I wouldn't lap a primary CPU, especially not a pricey one like your Ph2 940.

First things first though--set everything up and let it run, get a gauge of temps and make your judgments first before lapping. It might be entirely unnecessary.

On a slightly unrelated note--are the IHS's on the new Ph2's easily removable?
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Quote:

Originally Posted by guyladouche View Post
I know I sound like a sissy, but personally, I would never lap my primary CPU. Ironically, I've never had a CPU just die, so I've never had to worry about the warranty.

BUT what does worry me is messing something up during the lapping process--then you're SOL.

I do plan on lapping my 2180 if I don't sell it the next time I upgrade, but I wouldn't lap a primary CPU, especially not a pricey one like your Ph2 940.

First things first though--set everything up and let it run, get a gauge of temps and make your judgments first before lapping. It might be entirely unnecessary.

On a slightly unrelated note--are the IHS's on the new Ph2's easily removable?

Nope you would probably break the CPU ( Safer to lap)
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Quote:

Originally Posted by guyladouche View Post
On a slightly unrelated note--are the IHS's on the new Ph2's easily removable?
Yes, they just have a very easy to remone hs
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