80C is a little scary.

Looks like the GTX 780 is coming at about $650, according to this article. It seems like a better deal than the Titan in terms of performance offered for the price.


article:
http://videocardz.com/41960/first-geforce-gtx-780-review-leaks-out-inno3d-gtx-780-ichill-exposed

Yeah - cooling was the first idea that came to my mind.. With no spacing between the GPUs he cannot cool them down properly with air only. I'm wondering at what temperatures are those Titans running, but I believe they must be throttling.
Water cooling is nice, but when the ambient temperature is higher in summer, it's less efficient.

GeForce Titan an air inlet at the back of the card, the air is extracted from inside the PC outwardly.

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Nice. Nice.

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TITANS is the best four?

Yes, they are the fastest single core GPU and use exhaust cooling, but the Titans are not working for here, yet - Some Beta success recently!

The GTX780 is basically a Titan, but with less cores/shaders. Probably ~15% slower for here.
The GTX780 will be much better value for money at just over half the cost (~$650), but personal preferences, space limitations... come into it for some. If its performance turns out to be 25% faster than a GTX680 (for here) that would suggest the GTX770 will be <25% faster than a GTX680.

The GTX770 (end of the month) is basically a GTX680 (GK104), but with a slight core revision, faster memory (16.6% faster) and a higher TDP. I'm curious about the performance improvements 16.6% faster memory will bring, but it's obviously at the expense of power. I would speculate that the boost might also be slightly higher and performance is at least 10% better than a GTX680, but not 20%. It will be interesting to see the price/performance of the GTX770 against the GTX780, not that I'll be splashing out on either. The performance/Watt is unlikely to favor the GTX770 (230W TDP vs 250W TDP)...

http://videocardz.com/41960/first-geforce-gtx-780-review-leaks-out-inno3d-gtx-780-ichill-exposed

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http://www.amazon.com/EVGA-GeForce-Dual-Link-Graphics-03G-P4-2781-KR/dp/B00CUIVTCS/ref=sr_1_17?s=electronics&ie=UTF8&qid=1369317160&sr=1-17&keywords=GTX+GeForce+780

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GeForce Titan an air inlet at the back of the card, the air is extracted from inside the PC outwardly.

That's the way most reference cards have worked for many years. Believe me it does not alleviate the problem of running GPUs in such close proximity. I used to run some well ventilated boxes with 3 GPUs. Temps were high on the top 2 cards even at high fan speeds. I had to leave the side panel off and blow a big fan at them for cooling. Later I tried putting one of the non-shrouded MSI PE GPUs in the center position. That worked better but still hotter than I like to see. IMO there's not a whole lot of reason not to just run 2 boxes with 2 cards each. It's cooler, much cheaper and the cards will generally run faster than the 4x boxes. There is the water cooling option for the GPUs but that adds a LOT more money and you can forget the warranty on the GPUs. As far as that goes some vendors will also scrap the warranty if the card has been running too hot...

I agree, if space isn't an issue, 2 GPU's per system is plenty for most people. Adding a 3rd makes cooling very difficult - I've always had to leave the side panel off and add extra fans. I've only had 4 small GPU's in a system once, and it was more trouble than it was worth.

While you can buy Water cooled GPU's from some manufacturers, they cost far too much.

For 3 GPU's I would water cool the CPU. This reduces ambient case temperature and heat radiation onto the top GPU. I find that a case fan aimed at the side of GPU's helps a bit, as does placing a fan externally at the rear of the case to pull the air through. I also take out all the slot cover plates.

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Don't take this as advertisement or anything considering that the company is founded by our lab leader. I hope I don't go against any rules here. If I do I'll just delete the post.

After trying out tons of cases and most of them failing at cooling 4 gpus correctly, our PI designed the following cases which we now use: http://www.acellera.com/products/metrocubo/
They seem to work perfectly considering the relatively simplistic design http://www.acellera.com/products/metrocubo-gpu-chassis/, so I don't know, maybe you can get similar results if you make a similar design.

Unfortunately though I think they are not sold on the market or from the company (without buying an ACEMD license, which would be probably useless for most here) :/
It's just that I find it incredibly weird that there are none (or not many?) cases available on the market that can cool 4 gpus.

Interesting link, looking around I saw:

> ACEMD is compatible with CUDA and OpenCL, the new standard framework for
> parallel and high-performance computing over different architectures.

Any new news coming, like OpenCL support?

Haha yes I was shocked now that you quoted that! I asked around and it is apparently incorrect and should be fixed.
No idea if there are any plans though for OpenCL :/

Thought that might bring a smile :-)
Thanks for checking it out.

Il y a la solution de mettre une carte mère avec 7 PCI Express et de mettre une carte graphique un slot sur deux ?



There is a solution to a motherboard with seven PCI Express graphics card to a slot on both?

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You could use PCIE riser cards, but that would require an open case/no case (rack) build. Then there is the issue of supporting 7 GPU's - 4 might be the limit on Windows, and I'm not sure how easily it can be done on Linux. Also if you're talking about high end GPU's then you would need a 1500W PSU minimum. I've seen a 13 PCIE2 slot system, so these things are doable, just very expensive.

Regarding the Metrocubo GPU Chassis. They are hand made, so they are expensive, however I wouldn't be too much of a stickler regarding the brochure info, I expect Acellera would accommodate more bespoke models including the GTX770, and presumably the GTX780 and Titan when these GPU's are compatible with the software. They might build to facilitate other PCIE based research (AMD/ATI and Intel's Xeon Phi). If you are interested contact Acellera and ask.

chassi photos

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If I do upgrade, I'll just give away my GTX670's to anyone who wants them but only to folks here at GPUGRID.

I'll take a couple. ;) I run Linux and power cost here is 7 cents per kWh.

No problem, I'm serious about what I said. They have to get that chip working here first so it will be a couple months at least. I know I wouldn't be able to use the water blocks that are on them (Heatkiller), so those will go with them along with the stock heatsink and fan.

80C is a little scary.

Whatever Titan runs, you can be pretty sure it's running at (80 +/- 1)°C, unless someone changed the stock temperature target. Titan's standard behaviour is to set the boost bin (and hence power consumption) so that this temperature is reached. Improve cooling and it will still run at 80°C, just faster (until the maximum bin is reached). This temperature target can be set easily via typical OC utilities, though.

MrS

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Scanning for our furry friends since Jan 2002

Is the GTX Titan that much different from other keplers?

Nvidia's documentation (http://www.nvidia.com/docs/IO/123576/nv-applications-catalog-lowres.pdf) says the K10, K20, K20X will run ACEMD.

So what's the deal?

Operator

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