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Water-cooling 3 Radeon 6950's

Last response: in Overclocking
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August 22, 2011 11:41:16 PM

Greetings all,

I've put together a bitcoin "mining rig" using 3 radeon 6950 graphics cards, and had planned to cool them with a Swiftech H20-X20 system (http://www.jab-tech.com/Swiftech-H20-220-Edge-PC-Liquid...) and Swiftech 69XX heatsink/waterblocks (http://www.swiftech.com/HD6900-HS.aspx). This is my first attempt at water-cooling and I'm pretty apprehensive to just throw it together and potentially ruin my equipment.

The questions I have are:

1) How can one connect the waterblocks in a series without the coolant heating up and being ineffective by the time it gets the the third card. Would this even be a big problem?

and

2) I have read that simply running tubing from one waterblock to another will cause resistance which is not good for the radiator pump. Is this true, or would the pump be okay?

Here's some pictures of the equipment and the setup, any help would be very appreciated.

http://i29.photobucket.com/albums/c273/tiabobs1/photo9....

http://i29.photobucket.com/albums/c273/tiabobs1/photo8....

http://i29.photobucket.com/albums/c273/tiabobs1/photo7....

http://i29.photobucket.com/albums/c273/tiabobs1/photo6....

-KBundy
a b K Overclocking
August 23, 2011 12:39:04 AM

the water will not heat up much as long as your flowrate is good enough.

Are you running 3 6950's on one 240mm rad? That is not much radiator space for 3 hot cards... you may want to consider adding another large radiator.

What pump are you running?
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August 23, 2011 12:56:06 AM

Hey,

Thanks for the reply, like I said I'm a complete noob when it comes to water cooling, I do know that the radiator has 2x120mm fans on it, and there's also a big fan on the top of HAF932 case where I was planning on mounting the it. Pump specifications are here http://www.swiftech.com/mcp35x12vdcpump.aspx.

-KBundy
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a c 324 K Overclocking
August 23, 2011 1:13:58 PM

Thinking its the Swiftech Edge kit which looks to be the MCP35x, which is great.

I'd say you'll need at least another 2x120 rad...at very minimum...might even consider an additional 3x120 rad or some flavor of 140mm or 200mm rad. Also depends if you are going to watercool the CPU or not?

Yes, running all blocks in a serial line is fine and usually recommended. There are alternatives to setting this up in parallel, which would also be good and the only time you can consider a parallel branch.

You shouldn't have issues with heating...just seriously consider adding more radiator space...typically, I suggest a 2x120 per CPU or GPU...so adjust accordingly.

Good luck...let us know when you are ready to start thinking about pulling the trigger on this loop.
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August 23, 2011 9:40:22 PM

Is the extra radiator absolutely necessary? If I were to run one loop through all three cards with the radiator that comes with the Swiftech H20-220 kit it would be too hot? The problem I'm having is that I'm running out of days to work on this with my technician before I have to go back to school, if I had to order another radiator, I would be very screwed as far as assembling this thing at school by myself.

Anyone else think that the heat would be a problem? Keeping in mind there's a big fan on the top of the Coolermaster HAF 932 case where the radiator would be mounted.

*Edit: Also no, I would not be watercooling the CPU, only the three gpu's of the graphics cards.
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a c 324 K Overclocking
August 23, 2011 9:47:06 PM

Quote:
Is the extra radiator absolutely necessary? If I were to run one loop through all three cards with the radiator that comes with the Swiftech H20-220 kit it would be too hot?


Yes, that 220 rad isn't going to cool (at least very effectively) 3x 6950's.

We know what we are talking about...but go ahead if you really want. Maybe its good enough cooling for what you want...it seems like you really didn't like the answers we gave you.

If you are going to do this, SERIOUSLY consider very good fans (2000rpm's + high CFM) in push/pull.
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a b K Overclocking
August 23, 2011 10:13:07 PM

I agree, another radiator is best, but if you must use 2x120mm rad only get rid of the big fan and get what rubix said... 4 2000RPM push/pull... I would say at least 90+ CFM.
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a c 324 K Overclocking
August 23, 2011 10:19:30 PM

If you can go with a thick rad, that will help a lot as well.
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August 23, 2011 10:51:59 PM

I'm sorry, your kind of right that I didn't really like the answers I got..

Being this is my first time using watercooling, I have absolutely no idea what i'm doing...

I'm not even quite sure how to install the kit that I already have, the instruction book that it came with doesn't really make too much sense to me...

If I can't even figure out how to install this easy setup "all in one kit," I'm not sure how i'm going to be able to add even more parts...

Does anyone know if someone has created a step by step guide to installing this stuff? Like I said, now that I have to order even more parts, I'm going to be having to do this by myself at school, so detailed instructions would be very helpful.

Thanks again, sorry i'm such a noob...

-KBundy
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a c 324 K Overclocking
August 24, 2011 12:12:57 AM

What do you currently have and what guide? If you have some links to products, post them up and we can help you out.

And I understand your frustration...when you are new to something, it all seems foreign at first. But yeah, you are going to want to really stop to consider how much heat in watts those 3 cards will be pumping out and then choose a rad/fans appropriate for that loop...
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August 25, 2011 3:03:25 AM

rubix_1011 said:
What do you currently have and what guide? If you have some links to products, post them up and we can help you out.


Okay, this is what I have:

1) Coolermaster HAF 932 Case = http://www.newegg.com/Product/Product.aspx?Item=N82E168...

2) 3x XFX Radeon HD6950 Graphics cards = http://www.newegg.com/Product/Product.aspx?Item=N82E168...

mounted with,

3) 3x Swiftech HD6900 Heatsink and GPU waterblock combos = http://www.swiftech.com/hd6900-hs.aspx

4) Swiftech H20-220 Edge cooling kit = http://www.swiftech.com/h2o-220-edge.aspx

5) Waiting to here back from Gabe from Swiftech to see find out if there's an eco-solution to running the three cards in parallel to increase the flow rate, and also avoid kinking of the tubing as the cards are only 1.6 inches apart.
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a c 324 K Overclocking
August 25, 2011 4:01:44 AM

Run them in series...you are using universal blocks...not really any other option that would work well.

You need another radiator...at least another 220...I'd suggest more (like I suggested before).
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August 25, 2011 4:35:05 AM

rubix_1011 said:
Run them in series...you are using universal blocks...not really any other option that would work well.

You need another radiator...at least another 220...I'd suggest more (like I suggested before).


I'm not 100% sure what to get, can you post a link of what you would recommend?
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a c 324 K Overclocking
August 25, 2011 1:52:31 PM

Well, it really depends where you have room in your case to put the other radiator...where do you feel you can put it? Depending on this, we'd have to consider space/fitment either standard or maybe a little minor modding. You can always mount externally using a radbox as well.
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August 25, 2011 2:55:31 PM

The H20-220 kit that I already have has a radbox attachment to externally mount it, so I could put that one on the outside if I had to. As far as where to put an extra radiator, the HAF932 has a "fillport" located on the front of the top part of the case, leading me to believe that they intended there to be watercooling mounted internally on the top of the case, in between the big fan that's mounted there, and the front of the case.
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a c 324 K Overclocking
August 25, 2011 3:02:55 PM

I guess it depends...most case manufacturers don't really develop cases that are advertised as 'watercooling ready' that really are excellent for these setups...some are better than others, though. But regardless, you wouldn't need anything to do with the fillport and the other radiator, but I understand your statement that it would be possible to mount the rad in the general area if that were your intention.
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August 26, 2011 12:39:59 AM

I guess that would be as good of a place as any, do you have any suggestions for radiator/fan combos to get? I was looking at these http://www.swiftech.com/mcr-x20.aspx, would it be possible to use the big fan on the top of the case as a fan to bring fresh air to the rad instead of getting those little fans to mount right on the radiator?
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a c 324 K Overclocking
August 26, 2011 12:44:51 AM

To be honest, I'm betting good 120mm fans for those would cool much better (and push much more air through) on that rad than using the big case fan. I'd almost place money on it.
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August 26, 2011 12:49:30 AM

I see... well do you know if those radiators that I just linked come with fans? Or do you know of where to get some decent 120mm fans for a good price?
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August 26, 2011 8:47:56 AM

Yes, yes you did indeed ;) 
Mmhm so I do see I chose the right fans... :p 
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a c 324 K Overclocking
August 26, 2011 12:52:49 PM

I've seen several people using those lately here and on other forums. There are actually a lot of pretty decent fans, but also a lot of junk ones as well. It's just a matter of looking at the fan specs and getting a good price/performance ratio that works for what you want.
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