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Conductive copper + laptop GPU

post #1 of 11
Thread Starter 
Is it ok if the copper shim/penny I use to use as a heatsink-bridge is conductive?

The laptop GPU has these things stick out but I don't think they're circuits. It won't short out the GPU if the copper accidentally touches one right?

http://img833.imageshack.us/i/47300195.png/

47300195.png
The things sticking out are circled in red...they don't conduct electricity right?
post #2 of 11
Just put electric tape over them.
    
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post #3 of 11
Thread Starter 
Quote:
Originally Posted by BakingSoda;12706875 
Just put electric tape over them.

Don't have any. Any alternatives?
post #4 of 11
those are most likely capacitors and resistors... and obviously the conduct electricity and are part of a circuit... why would something on top of the die touch them anyways?

Quote:
Originally Posted by Bluescreendeath;12706890 
Don't have any. Any alternatives?

you don't have any electrical tape? Stop now... return your computer to its manufactured state and leave it alone...
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post #5 of 11
Thread Starter 
My laptop heatsink doesn't make full contact with the top of the GPU die, so I'm using a filed-down penny as a copper-heatsink to bridge the gap. I'm worried in case it gets loose, it'll fry the GPU.

The only thing I can think of right now is coat the entire penny in non-electrically conductive MX-2 thermal paste...or put thermal paste over those metal thingies you say are capacitors.
post #6 of 11
Quote:
Originally Posted by Bluescreendeath;12707028 
My laptop heatsink doesn't make full contact with the top of the GPU die

What are you waiting for? modify the heatsink to do so!


Either bend slightly the heatpipe or lap down the heatsink, but having a penny there is only going to make your temps rise hard.
   
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by Artikbot;12707052 
What are you waiting for? modify the heatsink to do so! Either bend slightly the heatpipe or lap down the heatsink, but having a penny there is only going to make your temps rise hard.

Well the laptop heatsink is just one long heatpipe that is also connected to the southbridge and CPU chip...so modification isn't really possible.

Originally there was a piece of thermal pad there - so I'm replacing the thermal pad with the penny + thermal paste.
post #8 of 11
Thread Starter 
I just went ahead and used the penny...now I'm reassembling my lappy and hope it doesn't blow up in my face...
post #9 of 11
Thread Starter 
IT WORKS!!! biggrin.gif
And I didn't get a face full of smoke and shrapnel either!

My GPU 4650m OCed temperatures were:
Pre-penny mod
55'C idle, 95'C max @ load

Post-penny mod
55'C idle, 85'C max @ load

However, my CPU (x920) temperatures have gone up from:
57'C idle, 78'C max @ load 20minutes of Prime95
to
62'C idle, 87'C max @ load 20minutes of Prime95

I assume this is because the GPU is now transferring more heat so the cpu has less headroom
Edited by Bluescreendeath - 3/12/11 at 2:45pm
post #10 of 11
Thread Starter 
Btw 62'C idle and 87'C @ 100% prime95 load is fine for a quad-45watt Phenom mobile CPU right?
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