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!!WARNING !! Intel Core 2 Duo Stock Heatsinks !! WARNING!!



 
 
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  #1  
Old September 24th 06, 07:37 PM posted to alt.comp.periphs.mainboard.asus
It's Not Me
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Posts: 12
Default !!WARNING !! Intel Core 2 Duo Stock Heatsinks !! WARNING!!

This may be known issue to some, but here it is any way. Check your
heat sink for flatness across copper mating surface before installing!
I went through3 days or frustration trying to figure out my high
temperatures problem. I was getting upper 30's idle, and with load
going to astronomical 70's on a stock e6400. I can only hope chip
wasn't hurt. I finally ran across an article googling where some
others had bad intel factory heat sinks. No problem now as I used the
heat sink off my other e6300. I am now having to buy an aftermarket
heat sink to fix intels F-UP.
  #2  
Old September 24th 06, 08:25 PM posted to alt.comp.periphs.mainboard.asus
Paul
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Posts: 13,364
Default !!WARNING !! Intel Core 2 Duo Stock Heatsinks !! WARNING!!

In article , It's Not Me
wrote:

This may be known issue to some, but here it is any way. Check your
heat sink for flatness across copper mating surface before installing!
I went through3 days or frustration trying to figure out my high
temperatures problem. I was getting upper 30's idle, and with load
going to astronomical 70's on a stock e6400. I can only hope chip
wasn't hurt. I finally ran across an article googling where some
others had bad intel factory heat sinks. No problem now as I used the
heat sink off my other e6300. I am now having to buy an aftermarket
heat sink to fix intels F-UP.


I was reading yesterday, that non-flat heatsinks is also a
problem with aftermarket heatsinks. I recommend the "squash test".
Apply half-a-rice-grain sized dot of thermal paste to the
top of the processor. Do a test install of the heatsink.
Check the spreading pattern of the thermal paste, as it is
squashed by the assembly. The pattern may help you determine
how the two surfaces mate.

Up to a point, less thermal paste is better. Thermal paste is
intended to fill small gaps, and a tiny film of paste is
more effective than an air gap. But large gobs of thermal
paste are an insulator, so being overly generous with the
paste is also not a good thing.

Paul
  #3  
Old September 25th 06, 05:49 PM posted to alt.comp.periphs.mainboard.asus
fondue
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Posts: 66
Default !!WARNING !! Intel Core 2 Duo Stock Heatsinks !! WARNING!!


"It's Not Me" wrote in message
...
This may be known issue to some, but here it is any way. Check your
heat sink for flatness across copper mating surface before installing!
I went through3 days or frustration trying to figure out my high
temperatures problem. I was getting upper 30's idle, and with load
going to astronomical 70's on a stock e6400. I can only hope chip
wasn't hurt. I finally ran across an article googling where some
others had bad intel factory heat sinks. No problem now as I used the
heat sink off my other e6300. I am now having to buy an aftermarket
heat sink to fix intels F-UP.


If the PC is still running the CPU can handle it, signs of overheating are
when the PC freezes.

Short of starting the PC without a heatsink your not likely to damage the
proc under your circumstance, even then intel had throttling which would
protect the CPU, but I don't know if they still use it.
..

Have you tried approaching Intel for a replacement heatsink? Maybe you could
just lap it to make it flat?


  #4  
Old September 25th 06, 10:34 PM posted to alt.comp.periphs.mainboard.asus
It's Not Me
external usenet poster
 
Posts: 12
Default !!WARNING !! Intel Core 2 Duo Stock Heatsinks !! WARNING!!

On Tue, 26 Sep 2006 00:49:56 +0800, "fondue" wrote:


"It's Not Me" wrote in message
.. .
This may be known issue to some, but here it is any way. Check your
heat sink for flatness across copper mating surface before installing!
I went through3 days or frustration trying to figure out my high
temperatures problem. I was getting upper 30's idle, and with load
going to astronomical 70's on a stock e6400. I can only hope chip
wasn't hurt. I finally ran across an article googling where some
others had bad intel factory heat sinks. No problem now as I used the
heat sink off my other e6300. I am now having to buy an aftermarket
heat sink to fix intels F-UP.


If the PC is still running the CPU can handle it, signs of overheating are
when the PC freezes.

Short of starting the PC without a heatsink your not likely to damage the
proc under your circumstance, even then intel had throttling which would
protect the CPU, but I don't know if they still use it.
.

Have you tried approaching Intel for a replacement heatsink? Maybe you could
just lap it to make it flat?

Too lazy too go through the hassle of rma with intel, already replaced
the heat sink now anyway. All is good now gotta just love these core 2
processors. I just hope somebody else with unknown heat sink problems
reads this post and it helps them. It just plain freaked me out as I
have gone thought dozens of heat sinks from the days of Intel 486 to
present, and this is the first I have ever had with major flatness
issues.
I guess I should mention that my heat sink was concave to the extreme,
I estimate in the range of 0.015 inch gap in middle of heat sink when
checked with a straight edge.
  #5  
Old September 25th 06, 10:56 PM posted to alt.comp.periphs.mainboard.asus
Gerry_uk
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Posts: 127
Default !!WARNING !! Intel Core 2 Duo Stock Heatsinks !! WARNING!!

Paul wrote:

I was reading yesterday, that non-flat heatsinks is also a
problem with aftermarket heatsinks. I recommend the "squash test".


Yes, I highly recommend this too. The patterns you will see are interesting.

--
Gerry_uk
  #6  
Old September 25th 06, 11:21 PM posted to alt.comp.periphs.mainboard.asus
Ron Krebs
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Posts: 159
Default !!WARNING !! Intel Core 2 Duo Stock Heatsinks !! WARNING!!


"Paul" wrote in message
...
In article , It's Not Me
wrote:

This may be known issue to some, but here it is any way. Check your
heat sink for flatness across copper mating surface before installing!
I went through3 days or frustration trying to figure out my high
temperatures problem. I was getting upper 30's idle, and with load
going to astronomical 70's on a stock e6400. I can only hope chip
wasn't hurt. I finally ran across an article googling where some
others had bad intel factory heat sinks. No problem now as I used the
heat sink off my other e6300. I am now having to buy an aftermarket
heat sink to fix intels F-UP.


I was reading yesterday, that non-flat heatsinks is also a
problem with aftermarket heatsinks. I recommend the "squash test".
Apply half-a-rice-grain sized dot of thermal paste to the
top of the processor. Do a test install of the heatsink.
Check the spreading pattern of the thermal paste, as it is
squashed by the assembly. The pattern may help you determine
how the two surfaces mate.

Up to a point, less thermal paste is better. Thermal paste is
intended to fill small gaps, and a tiny film of paste is
more effective than an air gap. But large gobs of thermal
paste are an insulator, so being overly generous with the
paste is also not a good thing.

Paul


While we're on the topic of stock heatsinks, which gets hotter during normal
use, the Northbridge or Southbridge? Then, considering the stock heatsinks
on the P5WDH, would it be worthwhile to replace the NB sink with a good
aftermarket HS like Zalman's NB HS? It got very good reviews.

Ron


  #7  
Old September 26th 06, 05:50 AM posted to alt.comp.periphs.mainboard.asus
Paul
external usenet poster
 
Posts: 13,364
Default !!WARNING !! Intel Core 2 Duo Stock Heatsinks !! WARNING!!



Ron Krebs wrote:

While we're on the topic of stock heatsinks, which gets hotter during normal
use, the Northbridge or Southbridge? Then, considering the stock heatsinks
on the P5WDH, would it be worthwhile to replace the NB sink with a good
aftermarket HS like Zalman's NB HS? It got very good reviews.

Ron


For Intel chipsets, you can look up power numbers in some of Intel's
accompanying documentation. For other companies, you may have to
rely on comments from other users, as to which runs hotter. If I
had to guess and a completely unknown motherboard, I'd say the
Northbridge stands a chance of running hotter.

Note that some unified chipsets (just one chip does both the
Northbridge and Southbridge function) run very hot. They could
be dissipating on the order of 20W. Of course, getting actual
datasheet numbers for these is impossible. In cases like that,
you may want to include a fan on the replacement heatsink.

The way you work this out, is use the thermal resistance of
the heatsink you are buying, and use the power rating of the
chip, to work out the temperature rise above the ambient inside
the computer case.

This is some sample data from the Aavid catalog for 3 heatsinks:

Length Width Height still with
mm mm mm air fan
200LFM

35x35 374624B60024 35.00 35.00 10.00 23.40 7.55 Black anodize
35x35 374724B60024 35.00 35.00 18.00 15.30 5.15 Black anodize
35x35 374824B60024 35.00 35.00 25.00 12.00 4.27 Black anodize

A 35x35x25 heatsink is a bit smaller than a Zalman. The still
air theta is 12 degrees C per watt. When 200 linear feet per minute
is blowing over the heatsink, the performance improves to
4.27 degrees C per watt.

Say the chip you are cooling, dissipates 10W. Say the room temperature
is 25C and the computer case air temperature is 35C. If you had
the above sample heatsink with a fan in place, the chip temp becomes
35C + (10W * 4.27C/W) or 77.7C. The Northbridge on my computer is
rated for 99C max, so that would at least avoid going over the max
temperature. But you can see, if you removed the fan, it becomes
35C + (10W * 12C/W) or 155C. That would cause the computer to crash,
at the very least.

I included that example, not because I am recommending you attempt
to gather enough info to do that kind of arithmetic, but to at
least demonstrate that removing the fan from a heatsink is not
always a wise idea.

If you want a good chipset cooler, this one is rated at 1.25C/W,
which is exceptionally good. The problem with a unit like this,
is it may bump into your video card. Before doing any mods,
think carefully in three dimensions, as to whether your mod
will bump into something inside the computer. Some of these
devices also mount rotated in the x-y plane, due to the min/max
locations of the screw holes on the mounting arms, so don't
assume that they will align square with the top of the chip.

http://www.swiftnets.com/products/mcx159-CU.asp

Of course, don't let me spoil your fun :-)

Paul
  #8  
Old September 26th 06, 09:09 AM posted to alt.comp.periphs.mainboard.asus
Jerry
external usenet poster
 
Posts: 17
Default !!WARNING !! Intel Core 2 Duo Stock Heatsinks !! WARNING!!


"It's Not Me" wrote in message
...
snip
I guess I should mention that my heat sink was concave to the

extreme,
I estimate in the range of 0.015 inch gap in middle of heat sink

when
checked with a straight edge.


Hell that is a lot, if yours is typical there has to be a serious
design problem here!...


  #9  
Old September 26th 06, 03:38 PM posted to alt.comp.periphs.mainboard.asus
Barry Watzman
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Posts: 2,148
Default !!WARNING !! Intel Core 2 Duo Stock Heatsinks !! WARNING!!

I don't think it's "typical", but there may have been a run of bad
heatsinks ... it may be typical of the bad ones.


Jerry wrote:

"It's Not Me" wrote in message
...
snip

I guess I should mention that my heat sink was concave to the


extreme,

I estimate in the range of 0.015 inch gap in middle of heat sink


when

checked with a straight edge.



Hell that is a lot, if yours is typical there has to be a serious
design problem here!...


  #10  
Old December 17th 06, 05:45 PM posted to alt.comp.periphs.mainboard.asus
M.A.Elstrom
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Posts: 2
Default !!WARNING !! Intel Core 2 Duo Stock Heatsinks !! WARNING!!

Only comment I can make on this thread is that the one that came with
my E6700 had the factory thermal paste inconsistently applied, leaving
open voids. I stripped it and applied Artic Siler 5. The heatsink
base was, however, dead flat.

Maelstrom

On Tue, 26 Sep 2006 10:38:31 -0400, Barry Watzman
wrote:

I don't think it's "typical", but there may have been a run of bad
heatsinks ... it may be typical of the bad ones.


Jerry wrote:

"It's Not Me" wrote in message
...
snip

I guess I should mention that my heat sink was concave to the


extreme,

I estimate in the range of 0.015 inch gap in middle of heat sink


when

checked with a straight edge.



Hell that is a lot, if yours is typical there has to be a serious
design problem here!...


 




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