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Vega's 2600k + Quad-6970 chilled build - Page 5

post #41 of 47
So did you end up watching to GTX580s? Pics of your set-up when you're done please.
post #42 of 47
Thread Starter 
Well I believe I have found what the problem is with tri/quad crossfire Eyefinity using 6970's on 3x 30" displays. It's a bandwidth limitation on the crossfire bridges.

If I drop the resolution down from 4800x2560 to 3150x1680, quad-fire Eyefinity magically works again. Using Heaven 2.1 which allows custom resolutions, up till about 4000x2000 quad-Eyefinity works. Above that bandwidth, it crashes.

So AMD decided to make their bridges run serial. So this means cards #4,#3,#2 data all has to pass to card #1 over a single bridge which it obviously can't handle at these high resolutions.

From TechReport: "One of those improvements is the ability to combine CrossFire multi-GPU setups with multi-monitor Eyefinity display surfaces. The appeal here is obvious, since pushing 24 megapixels with a single 5870 GPU is possible and sometimes quite workable, but not for every game. Generating that many pixels at the right quality levels would tax any single graphics chip. Making CrossFire work on this scale presents some challenges, however, as AMD readily admits. The core issue is the fact that the dedicated CrossFire interconnect used for passing completed frames between cards has "only" enough bandwidth to sustain a 2560x1600 display resolution. Even three 1080p displays will exceed its capacity."

Another huge design flaw just like the mixed Displayport/DVI-D Eyefinity screen tear design flaw. AMD has some very poor design decisions which will keep me away from them until they get their act together.

nVidia has the right way to design multi-GPU communications, parallel so that all cards can talk directly with each other:




Good thing I have 3GB GTX 580's on order so I can get rid of these 6970's!
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post #43 of 47
Quote:
Originally Posted by Lord Xeb View Post
Update to 11.1, that should fix your issues.
or create more
post #44 of 47
Quote:
Originally Posted by CallsignVega View Post
I've gone with a window A/C unit for a few reasons. For the BTU, a window A/C unit is much stronger and much cheaper. Thos aquarium chillers have pretty weak compressors unless you get into the $1k+ range. I also want to dump the computer heat outside which the window A/C unit is perfect for. An aquarium chiller just dumps it into your house for your HVAC system to struggle to remove.

I bought an Iwaki RD-30. I hope this thing is as good as they say it is, over $300 with power supply. I will be cooling a heavily overclocked CPU and 3-4 graphics cards. 1/10th HP compressor would be no good.

That is not true. First of all have you done any calculations of flow rates? Of course 1/10th hp chiller will be more than enough if you are using a 3000gph iwaki pump. Like I said, if you are running 30 feet, you need to calculate head pressure and take into account all the 90 degree bends. Just picking pumps based on numbers is not a very good move. Seems to me you don't know the first thing about fluid dynamics.
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post #45 of 47
Thread Starter 
Quote:
Originally Posted by mdd1986 View Post
That is not true. First of all have you done any calculations of flow rates? Of course 1/10th hp chiller will be more than enough if you are using a 3000gph iwaki pump. Like I said, if you are running 30 feet, you need to calculate head pressure and take into account all the 90 degree bends. Just picking pumps based on numbers is not a very good move. Seems to me you don't know the first thing about fluid dynamics.
What in the world are you going on about? The HP rating of the compressor has nothing to do with liquid flow rates. The point of chilling the liquid is to get it as low as temperature as possible, not to achieve super high flow rates.

A small 1/10th HP compressor will not be able to handle the heat load I plan on putting it through and keep sub-zero temps.

Who ever mentioned anything about 3000gph Iwaki pumps? The RD-30 is 318gph with a TDH of 33 feet. If anything, it's overkill. Which is why I've included a variable voltage control to control pump pressure. What other wisdom can you bestow?


On another note, I've gotten rid of the 6970's and have 3GB 580's on the way. Supposedly EK is looking into making water blocks for these non-reference boards and I'll be back in action.
Edited by CallsignVega - 1/31/11 at 9:39pm
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post #46 of 47
You are chilling a small volume of water not even 1 gallon most likely. How do you know 1/10 hp it is not enough? do you have calculations to show this? This is not how you design cooling systems.
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post #47 of 47
Thread Starter 
Quote:
Originally Posted by mdd1986 View Post
You are chilling a small volume of water not even 1 gallon most likely. How do you know 1/10 hp it is not enough? do you have calculations to show this? This is not how you design cooling systems.
1-gallon of coolant? That wouldn't even be enough to fill in the volume of space between the evaporator coil. The system is also designed not to run continuously. To prevent wide temperature excursions with a cycling compressor, approximately 7-gallons of coolant will be used.

A 1/10th HP compressor is tiny. Something you would find in a refrigerator. That would get immediately overwhelmed by my heat load. I am talking -20 deg C or lower coolant temps here. Just to put that into perspective, my 15,000 BTU unit has a 1.8 HP compressor.

I don't need to do super accurate calculations. I can adjust compressor run time and pump voltage to where I need it. Those numbers are dynamic. If the A/C unit is too strong, all that means is the compressor has to run less time.

Some info about BTU's for chilled setups from people that actually have done this stuff: http://www.xtremesystems.org/forums/...&highlight=btu

http://www.xtremesystems.org/forums/...&highlight=btu
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