Arctic Silver 5

[cjolley]

The short answer to the question of the order of conductivities:

http://www.madsci.org/posts/archives/mar99/920956179.Ch.r.html

chuck

[Greebe]

FYFI it's...

Themal Conductivity

Pb = 0.35
Sn = 0.64
Al = 2.18
Au = 2.96
Cu = 3.14
Ag = 4.08

Reference: Bushbaum's Complete Handbook of Practical Reference Data
ISBN#0-13-084624-4
page 18

[Brian R.]

My source was NSRDS-NBS8

Sorry, bad data.

Chuck - Copper is more reactive than silver toward oxidation. FYI - I don't want to predict conductivities from this...

[Greebe]

lol a chemist at the FDA who has next to no education and no practical experience in this field is telling that to an EE with 20+years of experience?

BTW get your facts straight if you want to counter. I'll stand by the 'chip on shoulder' comment, even if you insist that's your head instead

[Brian R.]

You don't even know enough to quote the temperature your conductivity data were measured at.

I never said that I worked at FDA. I don't know where you got your information.

[cjolley]

So why don't they make silver heat sinks?
Silver is not realy that expensive...
It's about $5 a troy ounce.
How much would a heat sink's worth cost?
chuck

[Jon P. Inghram]

It'd probably still be pretty damn expensive, and quite a bit heavier too.

[Greebe]

cj they do, but because it's way more expensive than Al or Cu where would be the profit sellling to joe public?

B get real, these #'s have been proven by the test of time (and the book has been in print for 30 years). Besides I've posted these #'s repeatedly over the years here on this forum, so how come you've decided that today of all times it's suddenly incorrect?!

chip on shoulder

[Brian R.]

Data you've posted is always suspect.

[Dilitante1]

Just remember everyone

[Greebe]

lol

[cjolley]

Originally posted by Greebe
cj they do, but because it's way more expensive than Al or Cu where would be the profit sellling to joe public?

Copper -vs- Silver
cost of matierial: $3 -vs- $10 = $7
Price by material: $20 -vs- $40 = $20
Profit delta + $13

Moichendizing, Moichendizing!
chuck

[Brian R.]

DOH! - the temperatures I quoted were Kelvin
here's the real data (@25 C):

Aluminum 2.37
Copper 3.98
Gold 3.15
Silver 4.27

Sorry

Same numbers as Jon posted.

Note that at around -100 C, the conductivities of copper and silver are equal

Even at 25 C, the difference between conductivities of silver and copper are only 7%. Not enough for anyone to get excited about, considering the difference in cost.

[Greebe]

lol @25c... room temp, how many cpu's run air cooled at that temp? ZERO!

Try 70-90c (we are talking about cooling Silicon), remember this is practical reference data, not impractical reference data

[Brian R.]

The difference in conductivities in copper between 25 C and 70 C is only 1.7%. Who, besides you, cares?

Educated morons are much too common.