thermal pate - will it fry my G400 ?

[athlet]

Hi,

i have a G400 16MB SH @ 161 CORE.
I have several heatsinks on it, f.e. a pentium1 heatsink+cooler on the back of the card so that the chip gets some cooling from the other side. I put some adhesive(?, i couldnt find a better translation) tape on the other side and sticked the heatsink on it. So far so good. the tape has a conductivity of 1.0 W/mk. I got a new paste today which has a conductivity of 2.9 W/mK! I know i will get some Mhz extra (dont ask why i need em ) when i put the new paste on the card instead of the tape. The only thing i worry about is: will i fry my chip because of a short connect(?) on my chip.

Here are some values of that paste (i tried to translate it in english):

Conductivity : 2,90 W/mK
'Indegredients' : Silicon / filled up with metal oxyd
Thickness/density(?) : 2,8 g /cm3
Dielectric (sth.) : 18 kV/mm
Specific resistance : > 10^15 Ohm/cm
point where the whole thing starts to burn : 280°C (ISO 2592)
works at a temperature of: -50°C bis +200 °C

thx for your help !

[Greebe]

GO for it!!! Looks good to me. Very similar to what I'm (& know there are others) using.

[athlet]

But it wont fry my chip, now will it ?
Cause i've been wondering: when i put a thin amout of thermal paste on my card and an aluminium heatsink on it and the HS touches the small pins (or whatever you call it) of the chip on the backside on the card, it will fry my chip right ?

Sorry for being such a chicken, but i do love (literally ) my G400 and dont want to loose it.

[rylan]

Now that you have to be careful of. The thermal epoxy you are using is not electrically conductive, which is what you should be using for that

However, if the heatsink is bare (not anodized) aluminum, then I would be careful since in places where the paste is then, it may have some small cross-conductance to the heatsink and to other resistors behind the chip. If you have an anodized heatsink (it'll have a hard black coating on it) then you are fine, since that coating does not conduct electricity. You can tell by scratching the coating on the side (don't do it on the bottom!) and you'll see the aluminum shine below the scratch since it would be exposed.

[DuRaNgO]

would you believe I have a heatsink fragtaped(metallic tape) to the back of my P3 with no sparks
jim

[athlet]

DuRaNgO: I see that you are a o/c by heart.
Risking your CPU just for some Mhz, i like that

My heatsink is aluminum and it has a thin coating on it that has the color of dark cooper, but i dunno if it is copper or not.

The problem with a fan only is: When i stick my 5x5cm fan on it without a heatsink, the small plastic round thing (dunno how to call it) that is the only part of the fan that is not rotating will entirely cover the part of the chip that gets hot. So the fan will just blow cold air next to the backisde of the core but not on the hot part of the backside. Do you understand me ?

thx again for your help so far.

[DuRaNgO]

that's why I used the Tennmax, it uses an ultra small yet powerful (8,500rpm I think) fan and stacked plate heatsink design to cool the chip without blocking the adjacent pci slot as well, though they are a little pricy/pricey (one of the two ) around $25usd
jim