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lapped my Q6600 today

G

graysky

Senior member
Well, after lapping my HS last night, I've had this nagging little voice in my head telling me to do the same from the CPU. I did the job totally with 800 grit sandpaper. Initially, I told myself I'd just buff what's there right now just to see if it's level. After about 30 laps in one direction and 30 in the other direction I discovered I had quite a concave IHS. So I just kept at it. Two 9x11 pieces of 800 grit later paper later I was left with a darn flat layer of copper looking back at me.



I was very happy to see that it lowered my temps doing the samex264.exe encoding test I have been using to benchmark them. Below are the numbers some of which you may have read in the thread I started about the heat sink last night. By the way, these numbers are my Q6600 @ 9x333 and as the caption in the image says, they are averaged over the entire encode:

Here

The one thing that still has me a little miffed is the difference between the two dies (Cores 1/0 and Cores 2/3). Either there is something internally that's off perhaps related to the HIS (which I?m not going to remove so don?t suggest it) or the sensors aren't placed symmetrically and I?m being mislead. Oh well.
 
Thanks man, here's the process I used: just a piece of 8x10 glass and tapped a strip of the 800 grit to it. A little splash of water and about 45 laps in one direction, clean sand paper and the CPU, then rotated 90 degrees and 45 laps in the other. Repeat. I then replaced the strip of 800 grit and repeated until I got this result (which by the way looks pretty scratched up due to the camera flash, and yes I know there's a little bit of the nickel left and that it still appears to be concave a little bit, but I didn't want to press my luck and will leave it as-is):

Pic here

BTW, I've been running 9x366 (3.3 GHz) for the past hour stable on stock voltage. Temps are little higher (53, 53, 48, 47) but those aren't averaged like the first set was; it still has about 40 min to go before I have the full data set.
 
Man, I'm getting neurotic with this. I was looking back at my pictures and that slight concave quality to the thing was starting to bug me so I pulled it out and hit it w/ the final piece of 800 grit which effectively removed that last little bit of nickel and took out more if not all of the concave quality.

Pic of chip

It did make a difference in temps as well:

Charts

Bedtime for me. I also think that the AS5 has a 200 hr breakin period when the temps can drop additionally (3-5C they say). So that's a cool thought as well.
 
Do you have to LAP the CPU with an after market cooler??

i am using intel stock cooler and have oced my CPU to 3ghz.. i get around 55idle and 65load using TAT...

you will tend to loose warranty if you lap the CPU right??

and one more thing... do you have to LAP after market HS before installing it on a new CPU, i mean is it mandatory??
 
goood on ya graysky! when I get my Extreme on Friday I'll check the temps and if needed lap it! I already have my cpu lapped. 🙂
 
Originally posted by: jaykishankrk
Do you have to LAP the CPU with an after market cooler??

i am using intel stock cooler and have oced my CPU to 3ghz.. i get around 55idle and 65load using TAT...

you will tend to loose warranty if you lap the CPU right??

and one more thing... do you have to LAP after market HS before installing it on a new CPU, i mean is it mandatory??
Click to expand...

Yo don't have to do anything. It's all about having OCD I think. It should run fine wo/ lapping. By lapping both, I got about a 7C decrease in my 9x333 load temps on the hottest core. 55 idle/65 load are high compared to what you could be getting... but so long as yo don't exceed those temps, you're probably fine as you'll likely get sick/upgrade your current machine before it burns out anyway.

Your last question: no, not mandatory. I just like it when things are efficient. My CPU was like a salad bowl (concave) and my HS wasn't perfect either, it was convex maybe by design. I don't see why the manufactures can't make their products flat to at least to higher tolerances.

Oh well.
 
Start a new thread and let us know how many C you gained. I'd also recommend that you do some benchmarking with your current setup (x264.exe encoding something that'll take a good long time, at least an hour). You can log the temps with speed fan if use a spreadsheet like excel or staroffice to average the temps for each core which will be a pretty good measure. I don't think you can just run a program like orthos and take a single data point and expect it to be an accurate reflection of the temps.
 
okey guys, their are couple of ways ot lap your cpu:

i also lapped my cpu and got excellent load temps:

im on water so dont expect these kinds of load temps:

Voltage 1.37V real in bios its 1.425

Thats how bad my boards vdroop is:

http://i125.photobucket.com/albums/p73/aigomorla/X3220.jpg



Now the first stage in lapping is to go out to a autoparts store. Not a hardware store:

Their you will find all sorts of metal used sandpaper.

My personal favorates are these:

400 grit - to start if its really not flat
700 grit - evens the edges out
1000 grit - even more flat, also adds the first stage of mirror finish
2000 grit - this is purely costmetic. however if you want it this shiney:

http://i125.photobucket.com/albums/p73/aigomorla/IMG_0569.jpg

2000 grit to finish.



Now what i use is a flat piece of glass. You can get that at any hardware store. The piece doesnt need to be very big. At most a 6inch by 6 inch would be enough. However, i like to use a bit bigger piece to help with HSF, or blocks.

1 feet x 1 feet of glass.

B4 you start, draw an X with a sharpie on top of your CPU. This will show you how much your shaving. Use it as a guide. Once the X is completely gone, that means you shaved all the unflat area. However some people like the OP like to take the nickle off. I did as well. Then you want to work with the 400 and 700 until all the nickle is off, and finish with the 1000grit. And polish with the 2000grit


Put the SP, on top of the glass. Put a small drop of either cooking oil, or distilled h2o. I prefer the cooking vegi oil. And gently work your CPU on top of the SP. Repeat until the oil becomes really thick and extremely red. Then repeat.


GL. on your results.

ALso this will void your warrenty. So only do it if your not expecting an RMA from intel.


 
Sounds good but I might avoid cooking oil... I would think it might be too difficult to remove/not volatile enough. I've read somewhere that low odor kerosene can be used but I don't camp and didn't need to buy a gallon of the stuff only to use 1 oz. I used just water on the CPU and water with 1 drop of dishsoap for the HS.
 
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