Page 1 of 3 123 LastLast
Results 1 to 15 of 39
  1. #1
    Joined
    Jun 2007
    Posts
    99

    lapped my Q6600 (pics and results)

    Well, after lapping my HS, I've had this nagging little voice in my head telling me to do the same from the CPU. I did the job 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 finished the job and put a mild shine on it with a sheet of 1000 grit I got from the local auto parts store just for the f*ck of it.

    Here are a few pics and the temp. results I got from lapping both my CPU and HS. I would recommend that anyone wanting the best $20 decrease in temps should consider lapping both the CPU and HS.

    Hardware details: Q6600 @ 9x333 and vcore of 1.2625V in the BIOS, P5B Deluxe (vdroop modded) cooled w/ an Ultra-120 Extreme (lapped) with Scythe/s-flex SFF21F 1600RPM fan, in a P182 case:

    Temp results:

    Each temp. point represents an average of data collected over approx. 1 h time period during the 2nd pass of a 2-pass x264 encode of a 720x480 DVD source using a high quality video profile. Data points were logged by Speedfan every 3-4 seconds over this time period. The average CPU usage was >99 % on all 4 cores throughout the experiments. Also room temp was between 20-22 °C.

    This is my preferred setup: 8x10 piece of glass on a flat counter top. You can see I cut the sandpaper into a thin strip (about 2-3x the width of the CPU) and attached it to the glass with some tape. The glass is in turn tapped down to the counter top to keep everything immobilized. You'll want to moisten the sandpaper with some mildly soapy water (like 1 drop of dish soap in 1 liter of water), then blot it until you have no pools of water. Remember, if you get water into your chip you're sunk. Then simple hold the chip and gently move it front-to-back. I don't recommend doing circles since they tend to give uneven results. The copper color on the sandpaper is material I just removed from the IHS on the chip.



    Remember, you're after a flat chip here so don't push down on it as you lap: let the weight of your hands do it without extra pressure and go slowly so you don't use uneven pressure. After about 30 laps front-to-back, I gently blotted off the chip with a moist paper towel to remove the metal particles I just sanded off, then rotated it 90 degrees and repeated 30 laps front-to-back. Then you'll want to clean off the sand paper (add more water, then blot it damp and repeat). I'd recommend changing the sand paper frequently since it's really doing the work for you. That's basically it. You can start with 400 grit or so and lap until you can't see variations in the surface of the chip (no silver color is often a good indication that you're flat), move up to 600 or 800, then finish off with 1000 or 1200. I did mine entirely with 800 and 1000, it just takes longer with finer grits. Remember, the key is FLAT, not shiny. I would recommend that you do NOT polish the chip with a metal polish since you'll leave behind a residue that will hurt your heat transfer.

    You can test the flatness at any point during the lapping process by carefully placing a razor blade across the surface of he chip and looking at the area where the razor meets the chip. Now position your eye so that you're level with the chip and pointing at a light source (a lamp will do nicely). Do you see any light coming though? If so, keep at it. Another test you can do is to take a black sharpie marker and make about 9 dots in a 3x3 grid on the surface of the IHS. Lap about 5 times, rotate, and do 5 more. Now look at the dots... did they wear off evenly? If not, keep at it. You can also simply draw an "X" from corner to corner on the chip and do this as well. Again, you'll looking for even wear.

    After about 5 minutes of lapping in each direction with 800 grit. You can see how the nickel plating has come off around the edges first which shows you just how concave this thing really was:


    After more lapping most of the nickel plating has been removed expect in the really low areas (the camera flash fired so close to the chip makes all the scratches show up much more so than they do under normal light):


    Switched to 1000 grit, here's the result:


    Another angle shows the nice dull reflection, still very so slightly concave at the extreme edges, but good enough for me:


    I would recommend that anyone wanting the best $20 decrease in temps should consider lapping both the CPU and HS.

    Oh, I also thought I'd mention that before I lapped the chip, I had a pretty big difference in core temps when loading with prime95 or 2x orthos: up to 6 degrees C (sorry I don't have a screenshot of this). Lapping the chip REALLY evened-them-out as you can see from the coretemp numbers after the IHS and base of the heatsink were lapped (stressed using prime95 v25.3):



    The table I showed above was not based on prime95 or orthos, it was based on x264.exe which is a video encoder. It is good at using all 4 cores, but not as efficient as prime95/orthos which explains the differences in temps from that table.
    Last edited by graysky; 11-30-2007 at 03:09 AM.
    http://encoding.n3.net <--- for all your DVD and audio CD backup needs!


  2. #2
    Joined
    Mar 2004
    Location
    mtl,canada
    Age
    36
    Posts
    37,301

    Re: lapped my Q6600 (pics and results)

    u droped 10c? by lapping? nice!

    add a couple 120mm fans overhead to drop temps by 10+ celsiusD.S.C-12(2)-disclaimer : whatever u do with your hardware/software is your
    responsibility, which i dont hold if u break anything

    GRAB here OcBible v1.55 and Guidemania v1.21
    scary pooch?pooch#1taking ball from dogpooch pulln on ropeme on board after 2 years
    of no board
    http://gonny.se/ <-cool lady http://www.mediafire.com/?8dmg21ms1vx
    IN MEMORY OF HOW BM WAS TREATED HERE...

  3. #3
    Joined
    Jan 2004
    Posts
    7,504

    Re: lapped my Q6600 (pics and results)

    You lapped the core itself? hardcore!

  4. #4
    Joined
    Mar 2004
    Location
    mtl,canada
    Age
    36
    Posts
    37,301

    Re: lapped my Q6600 (pics and results)

    looks liek its just the hs

    add a couple 120mm fans overhead to drop temps by 10+ celsiusD.S.C-12(2)-disclaimer : whatever u do with your hardware/software is your
    responsibility, which i dont hold if u break anything

    GRAB here OcBible v1.55 and Guidemania v1.21
    scary pooch?pooch#1taking ball from dogpooch pulln on ropeme on board after 2 years
    of no board
    http://gonny.se/ <-cool lady http://www.mediafire.com/?8dmg21ms1vx
    IN MEMORY OF HOW BM WAS TREATED HERE...

  5. #5
    Joined
    Jul 2002
    Location
    sacramento,ca.
    Posts
    801

    Re: lapped my Q6600 (pics and results)

    Very nice. Great temps on air. I had to lap mine as well. It was scary taking a 850 dollar processor and voiding my warranty the day I got it.
    Core I7/GA-EX58-UD4P
    6 gigs of ddr3 1600
    Raid 0 x2 WD 320AAKS
    4870 X2
    Silverstone 1000w Strider psu
    Thermochill PA 120.3 with dual pumps

  6. #6
    Joined
    Jun 2007
    Posts
    99

    Re: lapped my Q6600 (pics and results)

    Quote Originally Posted by fatlazyhomer View Post
    You lapped the core itself? hardcore!
    It's was actually pretty easy to do; I'd recommend it as the cheapest way to shave off load temps.

    Quote Originally Posted by 0156 View Post
    Very nice. Great temps on air. I had to lap mine as well. It was scary taking a 850 dollar processor and voiding my warranty the day I got it.
    Yeah, that feeling went away after I saw the temp decrease though
    http://encoding.n3.net <--- for all your DVD and audio CD backup needs!


  7. #7
    Joined
    Mar 2004
    Location
    mtl,canada
    Age
    36
    Posts
    37,301

    Re: lapped my Q6600 (pics and results)

    ill prolly do it with me 4300. i should have some 12-14k grit around...

    add a couple 120mm fans overhead to drop temps by 10+ celsiusD.S.C-12(2)-disclaimer : whatever u do with your hardware/software is your
    responsibility, which i dont hold if u break anything

    GRAB here OcBible v1.55 and Guidemania v1.21
    scary pooch?pooch#1taking ball from dogpooch pulln on ropeme on board after 2 years
    of no board
    http://gonny.se/ <-cool lady http://www.mediafire.com/?8dmg21ms1vx
    IN MEMORY OF HOW BM WAS TREATED HERE...

  8. #8
    Joined
    Feb 2005
    Location
    Santa Rosa, Ca.
    Age
    53
    Posts
    3,791

    Re: lapped my Q6600 (pics and results)

    Man.....I think that's what my QX6700 needs, not sure I have the balls though. I would be tempted to slap it in my Bridgeport lathe, but how would you clamp it down?

  9. #9
    Joined
    Jun 2007
    Posts
    99

    Re: lapped my Q6600 (pics and results)

    Way safer to use your hands and sandpaper on a piece of glass dude....
    also, what are your temps and what are your settings (vcore, multi and FSB)? What are you cooling with (HS or water block) and what TIM?
    http://encoding.n3.net <--- for all your DVD and audio CD backup needs!


  10. #10
    Joined
    Mar 2003
    Location
    Near São Paulo, Brazil
    Age
    48
    Posts
    1,416

    Re: lapped my Q6600 (pics and results)

    So, the Conroe's IHS is really copper beneath a nickel plate?
    ***STILL WITH THE DARK SIDE, BUT PLANNING TO GO BACK TO AMD SOON ***

    C2D E6400/ GA-P35-DS3 / HD4670


  11. #11
    Joined
    Jun 2007
    Posts
    99

    Re: lapped my Q6600 (pics and results)

    Sure is
    http://encoding.n3.net <--- for all your DVD and audio CD backup needs!


  12. #12
    Joined
    Jul 2003
    Location
    Australia
    Posts
    14,221

    Re: lapped my Q6600 (pics and results)

    Quote Originally Posted by graysky View Post
    Another angle shows the nice dull reflection, still very so slightly concave at the extreme edges, but good enough for me
    You mean convex Usually if that happens when lapping, it can be attributed to sanding too far from your own centre of gravity as your more distant digits (fingers) will lose more downward pressure than the digits closest to you (thumbs). If you can stand close to the sanding surface and lean over it a bit, you should find it easier to get a more flat surface through maintaining even pressure around all edges of the CPU. Also helps to do small movements so you're not traveling far from your own centre of gravity.

    As you've probably found out, the reflection only really stands out when viewed at an angle. Some people suggest to put the lapped CPU or heatsink onto graph paper to try and spot warping, but personally I find using a straight metal edge (like the side of a metal rule) against the lapped surface across several points on both the X and Y axes and from corner to corner, then looking for gaps by looking at the heatsink with a light behind it - the light should shine through the gaps. Makes it easy to see where the warping or curving may be and to see how much it is warped/curved. if you do experience warping, try sanding diagonally as well.

    Quote Originally Posted by graysky View Post
    I would recommend that anyone wanting the best $20 decrease in temps should consider lapping both the CPU and HS.
    It is a pretty impressive outcome. I helped a mate lap his el-cheapo Celeron CPU several weeks back. He had even bigger gains and as a result is able to pull off some monster overclocking feats on just air cooling.

    Quote Originally Posted by frosty22
    how would you clamp it down?
    You clamp/stick the paper down. Should be pulled taut across a flat surface (like glass) otherwise the CPU or heatsink will catch on the paper as it ripples. A good idea to protect the base of the CPU is to use the black protective plastic thingy that is attached to the CPU in the Intel packaging.
    Last edited by Mjölnir; 06-07-2007 at 12:09 AM.

  13. #13
    Joined
    Aug 2003
    Location
    USA
    Posts
    5,846

    Re: lapped my Q6600 (pics and results)

    I've noticed on a lot of LGA CPUs that the heat spread on the core is a bit convex as well, but the middle, where the core is, is flat enough to make good contact to the heatsink.

  14. #14
    Joined
    Jun 2007
    Posts
    99

    Re: lapped my Q6600 (pics and results)

    Quote Originally Posted by madhatter256 View Post
    I've noticed on a lot of LGA CPUs that the heat spread on the core is a bit convex as well, but the middle, where the core is, is flat enough to make good contact to the heatsink.
    ...interesting. Mine was actually lower in the middle making it concave. It's pretty tough to make good contact with a concave shape.
    http://encoding.n3.net <--- for all your DVD and audio CD backup needs!


  15. #15
    Joined
    Jul 2003
    Location
    Australia
    Posts
    14,221

    Re: lapped my Q6600 (pics and results)

    Quote Originally Posted by graysky View Post
    ...interesting. Mine was actually lower in the middle making it concave. It's pretty tough to make good contact with a concave shape.
    I was going by what you said - that the nickel plating had come off around the edges, which would indicate that there's more height in the middle. having said that though, it looks like there are a couple of grooves through the middle of the nickel.

    Usually you hear about surfaces being convex after lapping, though I have seen some that were very slightly warped before lapping. 'Tis why I wrote that last post

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •