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Old 07-02-2009, 09:43 AM   #61
xoggyux
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45nm is 45nm in my opinion.
what's that supposed to me?
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Old 07-02-2009, 11:26 AM   #62
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oy I'm off topic but... I <3 45nm

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Old 07-05-2009, 05:47 AM   #63
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does anyone know where you can get the high grit paper and rubbing alcohol from in the uk? i've tried places like wilko's and b&q but had no luck
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Old 07-05-2009, 10:24 AM   #64
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here in the US hardware stores (homedepot, ACE, Lowes, etc) have low-mid and sometimes high grits (abou 1000-2000). I have not found grit 2000+ in a local hardware store so far, if you want 2000 my best guess would be looking on the internet. Some hobby stores might carry high grit sandpaper, if you know of any you could go and take a look/ask. As for higher grits (5000+) AFAIK you will only find it in hobby stores and jewelery supply/store, they are very expensive. As the OP said about 1,500 grit and thats all you need for lapping, going higher is overdoing it and its just for the idea of having a mirror finish, which makes absolutely no difference in cooling compared to the same flattness/roughness but with dull finish.
I hope that helped. Hopefully today I can put my computer back together and report if my temps dropped a bit with a new fan in the case, brand new TIM, and CPU lapped up to 12K grit (this time wet sand as it is a lot faster, I used alcohol and took me like 45mins to go over all grits from 200[again, since I spotted an area of large TIM accumulation and wanted to flat it up] up to 12K.
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Old 07-08-2009, 11:25 AM   #65
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nice one

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Old 07-22-2009, 11:56 PM   #66
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The only place i found 2000 grit paper in the uk was here sway:
http://cgi.ebay.co.uk/10pk-COLAD-WET...3A1%7C294%3A50
however Halfords do wet and dry which (in their car body section up to 1500 grit @ 1.99 per pack, happy shopping..
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Old 08-01-2009, 05:37 AM   #67
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Wow! Such a reduction in temps is very impressive. Tempted to do this on my I7 920!
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Old 08-02-2009, 11:07 AM   #68
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so, i have no doubts this is effective, but i am curious as to the tolerances in the original manufacturing process on the processors. obviously, heatsinks have tons of different finishes, but how "unflat" (cant think of the right word ) are they (processors) directly from the factory that lapping can have such dramatic results?
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Old 08-02-2009, 06:58 PM   #69
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Originally Posted by sinohptik View Post
so, i have no doubts this is effective, but i am curious as to the tolerances in the original manufacturing process on the processors. obviously, heatsinks have tons of different finishes, but how "unflat" (cant think of the right word ) are they (processors) directly from the factory that lapping can have such dramatic results?
Processors are *microscopically* not flat. Most heatsinks are not flat. Every heatsink I have ever lapped has turned out to be far from perfectly flat. Even the water blocks I have lapped, although water blocks are generally flatter than HSF's.

If you want to see for yourself, use the marker trick. Draw an X with a marker and lap it. You can peek and see where the marker is rubbing away.
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Old 08-03-2009, 07:15 PM   #70
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Originally Posted by swaylight View Post
does anyone know where you can get the high grit paper and rubbing alcohol from in the uk? i've tried places like wilko's and b&q but had no luck
Ya try any Auto Body supply/Auto part store. If they sell auto Body Supplies they will have the sandpaper needed!
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Old 08-03-2009, 08:09 PM   #71
Josie Wales
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Don't get so hung up on a mirror finish. For maximum thermal transfer you do not need to go beyond 1200 to 1500 grit.

Quote:
Originally Posted by sinohptik View Post
so, i have no doubts this is effective, but i am curious as to the tolerances in the original manufacturing process on the processors. obviously, heatsinks have tons of different finishes, but how "unflat" (cant think of the right word ) are they (processors) directly from the factory that lapping can have such dramatic results?
For processor tolerances you will need to do the appropriate research. With an Intel solution it begins with the Datasheet and the Thermal/Mechanical Design Guidelines. Integrated heat spreaders are purposely designed with curvature due to the mechanical advantages of slightly concave surfaces and the limitations involved in the manufacturing process. With a bit more work you will find additional white papers that cover heatsink mating surface specifications in detail. Here are a couple of links to get you started.

http://download.intel.com/design/pro...hts/318726.pdf

http://download.intel.com/design/pro...nex/315594.pdf
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Old 08-04-2009, 03:50 PM   #72
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Josie Wales, that is EXACTLY the kind of information i was looking for, thank you! time to get in-depth.

thank you again.
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Old 08-11-2009, 05:34 PM   #73
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I lapped my q9450 yesterday up 2 1200 grit. 3deg cooler on hottest core. And 5 on lowest core. Only took me 60mins. Well worth my time, as it now makes me feel more at ease with my load temps.
I wish I had of done it earlier.
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Old 04-11-2010, 09:06 AM   #74
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This looks fun, I'm gonna give it a shot on a old nonworking processor and work up to some working ones I can test. Autozone near my house carries up to 2000 wet/dry sandpaper. Its a national store I think so you can probably get it anywhere.
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Old 04-11-2010, 09:20 AM   #75
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I don't think you need to get such a fine grit sandpaper. Anything over 1000 grit is probably overkill. If you really want to go all out you you can buy some jewelers rouge, or get a lens polishing kit.
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Old 04-12-2010, 07:19 PM   #76
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Meh, i didnt wanna do anything other than sanding i didnt like the idea of polish, the sandpaper is cheap so ill try it out and see how it does. Ill weed out grits if i find them unnecessary.
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Old 04-12-2010, 08:10 PM   #77
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I used 800 grit on my Zalman, and then finished off with some copper polish. No moirror finish, but enough where I had about 3 or 4 c drop in temps.
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Old 04-19-2010, 02:28 PM   #78
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-1

No changes in temps lapping Athlon64 3200 939
Used 380, 600, 1000 grit perfectly flat, sticks to glass its so flat.

Sure as hell wont be doing this to my newer chips that still have warranty left.

To each his own.....
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Old 04-19-2010, 05:56 PM   #79
Doglips
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Hey Slave did you lap your HS also? It may help...
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Old 04-19-2010, 06:06 PM   #80
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Quote:
Originally Posted by Doglips View Post
Hey Slave did you lap your HS also? It may help...
I used the stock hsf and a direct pipe hsf so no i didnt lap either.
The stock hsf is very flat when checking with a straight edge.
Dips in the cpu were evident however.

I may look it all over again but hell I used ac5 and applied it 3 different ways on each hsf.
The thin spread, tiny dot, and X methods no differences.
Im letting it set and cure maybe something will happen.

My thinking right now is whats the point if you still have a small amount of tim it has to transfer heat thru.
I'll give it another look over and maybe lapp a hsf too, Im just trying before I apply it to something worth something.
Not denying that it works but thus far, for me, no go.
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