Help on Lapping my CPU please

[BoboKatt]

I am having a bit of an issue. I have a q6600 G0 purchased a while back. From day one the temps using coretemp would have cores 0 and 1 at 10-12c higher than cores 2 and 3 at idle or at load. In fact at times the difference is even more than 10-12c.

When encoding videos using Handbrake and H.264? I can max out my 4 cores. With 2 hours of encoding my cores 0 and 1 are at 62 and 63, while my cores 2 and 3 are closer to 50 and 52 (OC?ed from stock to 3.4 GHz)

I originally thought it was my heatsink/fan (tunic tower). I lapped that as I figured it was much easier to lap that and less dangerous.
After lapping... same exact problem. I tried mounting the cooler 10 ways from sun-down... still like 10 to 12 c difference at idle and even at load. I tried regulating the mounting and decreasing pressure on one side, increasing it on the other but still nothing if worse. Tried applying less, more, one line, 2 lines of thermal paste.. still no difference.

I then purchased another cooler (ultra 120 extreme) and the EXACT same 10-12c difference between cores 0,1 and 2,3.

I am at odds... since at this point it HAS to be the CPU base. My question is how do you hold the CPU or protect it while its being lapped? Can I cover the "sensitive" side (the part that will be facing up towards me when I lap) with tape? How do I avoid getting dust/metal from the lapping process all over that? Do I still use wet/dry sanding?

For the life of me I have no idea as to how to check if my lapping process is correct after I am done... I still don't understand the "graph paper" test and using a razor blade on my CPU and trying to see light through it, shows me nothing.

I am at a point now that I am just willing to go out and buy another Q6600 G0.

Any suggestions?
thanks!

 

[AmberClad]

It comes with that plastic cover that protects the pads, which is pretty easy to grip. Or did you throw that away? Tape seems like it might leave a residue that would have to cleaned off.

 

[aigomorla]

Originally posted by: AmberClad
It comes with that plastic cover that protects the pads, which is pretty easy to grip. Or did you throw that away? Tape seems like it might leave a residue that would have to cleaned off.

tape very bad..

the black plastic thing is good.

if you dont have either and your lost a sponge will work. Make sure its dry tho.

or you can cut a piece of card board, and poke a hole in the middle where the resistors would be, and use that.

umm id lap the TR120Extreme b4 i lap the processor.

 

[BoboKatt]

spent well over an hour lapping my Tunic with no results (in trying to equalize the temps). It really seems that my CPU is "convex" as no amount of making my heatsink "smoother" or flatter seems to help. Unless I can make the TRUE concave 🙂 or is that the other way around LOL.

thanks for the suggestions.. will try the plastic cover it came with and if that is a no go.. heck the spounge sounds like a good idea 🙂

 

[krnmastersgt]

Maybe it's the mounting issue similar to what I had, care to share that link again aigo? 😀 Anyways I'm not sure about his cooler, but mine was so damn top heavy that when I ran the system on its side with gravity on the side of anchoring the cooler down more my temp deltas came down substantially.

Orrr the cpu is concave :x

 

[PremiumG]

Lap the CPU.. It's not that hard at all.

I didn't have the black plastic, so I just cut a square piece of foam and put it over the CPU. I used light pressure and several sheets of varying grit sandpaper. The sanding was very easy, much easier than sanding the heatsink.