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HD3870 heatsink re-seat

post #1 of 27
Thread Starter 
as the title says I've been thinking about either reseating the heatsink on my HD3870 or replacing it with an Arctic Cooling Accelero S1 Rev. 2.

The reason is that my temp are pretty high and the air coming out of the card's heatsink doesn't seem hot enough, which leads me to think that it is improperly seated. Also, one ram chip isn't actually thermal taped to the ramsink.

I need advice on thermal tape that would work for reseating the ramsink and any other suggestions on how I should go forward with this 'mod'.
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post #2 of 27
well i would reseat it, and use i think it was called arcic ceramic? It's an adhesive form of AS5, dont quote me on this but do a lil research on it
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post #3 of 27
I want to mention ATI cards are meant to have load temperatures of about 90c. It's how they are meant to operate. If you don't like this you can increase the fan speed to 60% and get load of about 45c. Riva Tuner is an excellent application to do this. These temps so drastically change because of the smart fan feature on the 3870 cards. This feature adjusts the fan speed by temperature and results in a quieter card that never gets too hot. However allot of people aren't comfortable with the 3870's normal operation temperatures, these people are free to take my advice and boot up Riva Tuner.
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post #4 of 27
Thread Starter 
It's not that the temps are uncomfortable, it's that I believe the heatsink is operating inefficiently because it looks improperly seated. Also I am really liking the idea of the Arctic Cooler because it can be operated silently.

My main problem is getting something to replace the thermal tape that is on the ramsink already.
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post #5 of 27
You can just get any thermal paste out there I guess. The sinks are mounted by screws anyway. Arctic silver 2 is some of the best paste.
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post #6 of 27
Thread Starter 
Quote:
Originally Posted by Neo83 View Post
You can just get any thermal paste out there I guess. The sinks are mounted by screws anyway. Arctic silver 2 is some of the best paste.
Taking a look at my card seems to indicate that the ramsinks aren't held on by screws, which is odd because there are reinforced holes in the card for screws.

More investigation is required...<runs to find more info>
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post #7 of 27
Thread Starter 
http://benchmarkreviews.com/index.ph...1&limitstart=4
This review of my card seems to indicate that using anything but thermal tape/pads is impossible for the memory.

Also, this next image shows the ram chip (in blue) that isn't making contact with the heatsink and doesn't even have a thermal pad. The yellow shows the screw holes that are vacant on my version of the card.
http://h1.ripway.com/METALHEADS/Luke/HD3870.jpg
I'm really thinking that having a naked ram chip is dangerous, any thoughts?
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post #8 of 27
Back of a Diamond Viper 3870:
Green dots there are screws for the ram sink's. Same as on my board
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post #9 of 27
Ahh in that case. Then im guessing theyve made space between sinks and chips to get room for the tape. Pretty stupid if you ask me. Why not just use ordenary paste there like on the GPU.

As for the one chip not having tape, thats gotta be an error. My Asus have tape on that one too.
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post #10 of 27
i got a zalman 9700 hs&f on mine and it gets as high as 70 sometimes, but normally mid low to mid 60s. i've been using zalman's thermal grease but i may be reseating it soon and try out AS5. i also use rivatuner to overclock and have the fan set at 100% and it's been very buggy. so i'm not sure i can take the whole riva thing too seriously.

by the way, what is the shelf life of AS5?
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