The LAST R600 Rumours & Speculation Thread

It's so miniscule IMO, that you could have skipped entirely in that list.

 

Giga = 10^9

 

Ahem..Indeed I should have looked that up myself before posting..

No offence taken..
but then the big deal about using Vapo Chill isn't such a big deal after all ..

 

So anyone got any clues how you go about getting the stuff to congregate at the hot bit when the hot bit is at the top?

 

Besides the wicks (bigger pic) that pakotlar just mentioned?

 

Ah duh, I was reading the diagram of the Vapochill where it says

as "in a Vapochill, there is no liquid puddle to wick" but that wouldn't work so there must be one

Random goose-chase:
According to the aformentioned wikipedia article, R134a is also known as R600a or more commonly Isobutane.
Which reminded me of the R520 info mis-translation in my sig, Cyclopentadiene which over a few hours turns into Dicyclopentadiene which is a somewhat bigger molecule.
Shades of R520 -> R580

So guess what Isopropane turns into?
Well I thought I was onto something with n-Butane which I took as an analogue to a multi-GPU R700 but its actually only CH3CH2CH2CH3 which is much more mundane & you actually have to work to turn it into that

 

Haha, that exact post is why I love this place. Only at B3D would you find such posts. Wonderful!

 

yeah its all marketing in the end.

 

I have to say, after seeing that link and reading about the Vapochill, I now want one for my CPU. R134a is the same substance used in automobiles now that R12 is is outlawed (except for the "fake" R12 that occasionally burns up the whole system), and they have been converted over.

What an excellent idea. Why has no one thought of it before?

I think that is a great idea for a GPU cooler. I looked in Newegg, but they don't have them. I will be buying one as soon as I can find one for my CPU (yes, I am sold on the idea! )

EDIT: Actually, yes they do now that I looked in a different way. Extremely reasonable price, too. 36.99. Not bad for phase cooling! Vapochill at Newegg Unfortunately it is currently out of stock (my guess is that it hasn't been released yet - ETA is 3/13/2007)

 

AFAIK, there isn't a wick in the Vapochill Micro, which is why it is shaped with an angle between the base and the pipes, and must be rotated so that the top of the heatpipes are physically above the base of the unit. The phase change liquid then evaporates up and drops back down with gravity.

I'm assuming that the lack of a wick makes the unit cheaper, easier to make, and more efficient at cooling, as you don't have to wait for the wick to draw the liquid back. The drawback is of course that you have to have the unit installed in a particular way.

I can't see that this system would work too well in graphics cards which can be installed in at least three different planes depending on your case, so I suspect the R600 cooler may well use wicks.

 

Don't the photographs of the R600 board which have been floating around clearly show that it's a heat-pipe cooler? This whole business is starting to sound like Internet Chinese Whispers to me.

 

Yeah but all the pictures I'm aware of were OEM parts that were 12" long. This would be for the retail version and have to be more compact.

 

All those pix have shown so far is that the non-retail board we've seen so far uses heatpipes.

The "Vapochill" cooler is rumoured for retail boards, which haven't been shown in any photographs so far (apart from a corner shown on VR-Zone, featuring the PEG1 and PEG2 power connectors, a bit of plastic that appears to be the cooler-shroud and not much else).

Jawed

 

Well OK, my point was this. We've seen pictures of the OEM board, which had heat-pipes. We've now heard that the retail board will have a Vapochill cooler, which in itself turns out to be a glorified heat-pipe. Indeed I read at least one reference which said "vapour chamber" rather than Vapochill. Which sounds like a heat-pipe to me.

Surely the simplest explanation is that both the OEM and retail boards will both use coolers which incorporate heat-pipes, albeit probably in a slightly different configuration, and that the "Vapochill" thing came about through rumours between translated between English and Chinese too many times by Google, and/or propagated by people who don't really know what a heat-pipe is?

As for size, seems to me that that's a function of the chuffing great fan rather than the presence of heat-pipes per se.

 

http://forums.vr-zone.com/showthread.php?t=130294

The first slide says over 80GB bandwidth but with 512bit and about 2Ghz memory frequency for GDDR4 should that not be 100-128GB or so ?

 

That slide is pretty old though.

 

They post slides that were proved to be fake long time back and slam OCW's table as fake. Thats hilarious.

 

Thanks for the clarification, no wonder it does not tally with the Daily Tech latest piece which seems to be a lot more likely.

 

Has someone here any idea of what order of magnitude the internal bandwidths on a GPU are? I mean storing shader-programs, texture cache etc.?

 

up to hundreds of gigabytes/s..