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Lapped vs. Un-lapped CPU - Page 2

post #11 of 22
Order a kit from EasyPCKits.com

All the kits are for lapping.

Those are the grits. Some only use to 1000, some only go from 400 -> 600, others go go 10 micron, some go to 10,000 grit gels.

All depends on how much you wanna work at it.
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post #12 of 22
More Lapping
I wouldn't go all lappy happy right away, install everything first and see how the temps are.
My example, my X6800 is concave (curved inward) and my Ultra is convex (curved outward), perfect match IMO and my temperatures prove it, 1.5 Vcore with 53° load temp on both cores.
OTOH if one or the other is too extreme it may be wise to lap the offending IHS Or HS.
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post #13 of 22
i have heard some say that lapping can make it worse in some situations. i remember looking at noctua site and they said something about having a ridged surface on the base of heatsink which they reckoned was better than smooth.

i guess its alll to do with surface area. technically a 1 inch by 1 inch (ish) cpu has a maximum contact surface area of 1 sq inch. a slightly rough surface gives a slightly greater surface, but that gets filled by thermal goop so the contact area stays the same. i guess the difference is which is better, more metal surface area with goop or a smooth metal surface with less goop.
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post #14 of 22
Thread Starter 
is it worth ruining a $300 CPU to get 5 degrees Celcius off the temperature, im not sure it is, unless there are other advantages

and i dont get this 400, 600, 1000... grit stuff, wat do these numbers mean
post #15 of 22
Quote:
Originally Posted by blade007 View Post
is it worth ruining a $300 CPU to get 5 degrees Celcius off the temperature, im not sure it is, unless there are other advantages

IMO No, 5° is being very generous.
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post #16 of 22
with grit paper the higher the number the smaller the grit, so the smoother the finish. eg, p60 would remove paint, p2500 would polish it
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post #17 of 22
Quote:
Originally Posted by RickTheUncivil View Post
with grit paper the higher the number the smaller the grit, so the smoother the finish. eg, p60 would remove paint, p2500 would polish it
The higher the number, the higher the grit. Grit is bassically a count of, well, grittiness.
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post #18 of 22
Quote:
Originally Posted by RickTheUncivil View Post
i have heard some say that lapping can make it worse in some situations. i remember looking at noctua site and they said something about having a ridged surface on the base of heatsink which they reckoned was better than smooth.

i guess its alll to do with surface area. technically a 1 inch by 1 inch (ish) cpu has a maximum contact surface area of 1 sq inch. a slightly rough surface gives a slightly greater surface, but that gets filled by thermal goop so the contact area stays the same. i guess the difference is which is better, more metal surface area with goop or a smooth metal surface with less goop.
I do not know if it would drop more if I would not grit my heatsink but the 10C difference in idle and 22-25C in load proves that lapping was not a bad choice ^^ (adding less thermal paste must haev helped too but I added too much even this time.. sigh..
    
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post #19 of 22
I got a 5 degree temp drop . I also lapped the IHS of the CPU. Be aware that lapping the CPU IHS voids the warranty. Zalman heatsinks come with a pretty good base if you want to avoid lapping. In my case the base of my Big Typhoon was rather rough and my CPU was not flat. You can check both with a strsight edge.
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post #20 of 22
Quote:
Originally Posted by cjgrosch99 View Post
I got a 5 degree temp drop . I also lapped the IHS of the CPU. Be aware that lapping the CPU IHS voids the warranty. Zalman heatsinks come with a pretty good base if you want to avoid lapping. In my case the base of my Big Typhoon was rather rough and my CPU was not flat. You can check both with a strsight edge.
Yeah like already mentioned noctual had a griddy base but the scythe ninja base was really flat. mirrorish, I ended up lapping it after seeing that it lost its mirroring and became kinda black. Well even with 600 I am hopping it will work well with the northwood. Maybe I should go buy a 1500 though...
    
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