Passive Cooled Radeon

[Stringent]

Something you don't see everyday on the current high end GPU. A passive cooled heatsink. Must be in competition with NVIDIA

http://www.ixbt.com/video2/images/sa...o-ue-front.jpg

http://www.ixbt.com/video2/images/sa...ro-ue-back.jpg

That must also take up the next PCI slot being that big. I don't think I'd even trust it in my system, I'd prefer a fan!

[jon bda]

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[Zaphan58]

Yeah they dont allow remote linking by the looks of it, anyway its nice to see a passive cooled card although one less fan is always nice, im sure it wont cool as good as a active cooled card hence a bit of a drawback for overclockers....

[TeePee]

Try this one: http://www.ixbt.com/video2/r9800pro-ue.shtml

It's an interesting read too...

[Aaron]

Looks like it's just a Zalman heatpipe with a different badge stuck on it.

[Stringent]

Originally posted by TeePee
Try this one: http://www.ixbt.com/video2/r9800pro-ue.shtml

It's an interesting read too...

Cheers TeePee, should have put link to original story ...

Here is the English version

http://www.digit-life.com/articles2/...800pro-ue.html

[m2c4u]

Lovely zalman What such wonderful products they make. I have a the heatpipe currently wrapped around my 9700 pro and its running fine with absolutely no case fans, just the cpu fan and psu. The surface area is huge on those things, Id be surprised to ever see one crapping out.

[Korky]

Its actually the r9800pro ultimate edition, chrome cooling and blah blah.

[SilentDeath]

tis nice, but tbh id prefer a normla fan (must b quiet though!) or watercooling which im getting next (silver waterblocks ). currently i have a vantec iceberq strapped to it as i sold my zalman yesterday (after 4 months). tbh the zalman is just TOOOOO big, if there was ANY kind of fan (even like in the tt giant2) the whole back half wouldnt be needed. i managed a clock of 375core on my 9700NONpro with this, thats +100mhz! (i had a 15cfm 80mm silent fan resting on the back). also it does get v hot after playing games for ages with no airflow!

also with the zalman one, there is almost no space for ramsinks, they need to be less than 10mm³ for the front ones, each and 10mm²x4mm high

[Gubbage]

i can't see any disadvantages other then size of a passive card all my graphics cards except Ti4200 have been passive and run fine even overclocked. i love zalman

[SilentDeath]

yea they clock well with it, but really for any card later than ti4400 u need some fan on it, even if its only pushing 3cfm, or it will get hot after a few hours of intensive gaming.

i relised that the amount of money i spent on passive heatsinks and quiet cooling, could acctually afford me watercooling, so now im selling the zalman, vantec and slk800, building my own waterblocks (out of silver! ), 2nd hand pump, and going to find on aold frigde or freezer to chill the water.

[Korky]

Why use silver? Copper is cheaper and a better conductor.

[Stoo]

Originally posted by Korky
Why use silver? Copper is cheaper and a better conductor.

Actually silver can be a better conductor:

Thermal Properties of Materials
Thermal Conductivity, W/cm-K
Metals
Aluminum 2.165
Beryllium 1.772
Beryllium-copper 1.063
Brass 70% copper, 30% zinc 1.220
Copper 3.937
Gold 2.913
Iron .669
Lead .343
Magnesium 1.575
Molybdenum 1.299
Monel .197
Nickel .906
Platinum .734
Silver 4.173
Stainless Steel-321 .146
Stainless Steel-410 .240
Steel, low carbon .669
Tin .630
Titanium .157
Tungsten 1.969
Zinc 1.024

And apparently a Silver/Copper alloy might be even better.

Edit: oooh, actually, apparently diamond is the best at 25(!!)W/cm-K, but expensive for now though until those diamond making machines start chucking out big enough quantities

Sure would make for a pretty heat-sink though

[SilentDeath]

are u sure those numebrs are right???

alu = 2.1, copper = 4.05, silver = 4.25, diamond sheet = 6.5 iirc

reson i am using silver is beacuse my dad has access to loadsa metal at work, one day last week he just came home with 2 peices of silver @ 97% pure, which he melted down and compressed into circles under 10 tonnes. copper (if i was to buy it) would cost more, probably £20 for each waterblock. and if my dad got copper from work, it would be in powdered form melted and compressed, but thats not as good as this would be porous? - im not sure what he ment.
btw the silver was solid b4 melted, not powder.

the waterblock seems like it will be very simple - 2 copper elbows with the bottoms cut off soldered to the silver base + a clip of some kind to hold it on. but it shouldnt matter, as im getting a 1200l/h pump and a fridge / freezer to chill the water

[Stoo]

Well, it was a direct quote from one of those science sites, so umm yeah.