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New Water Loop Suggestions

post #1 of 10
Thread Starter 
I am new to this forum and would appreciate any help I can get. I originally bought the Rasa RX240 water cooling kit to cool my i7 2600K alone. Now I want to toss my dual 6950s into the loop. To start, I bought the Corsair 800D case to have more space and better wire management. From everything I have read, I would need at LEAST an RX360 to cool these 3 components. I know I can modify the case to get another 240 in, but I would prefer not to if i didnt have to. I was wondering if the res/pump that came with the kit would be good enough to go through the XSPC CPU block and a couple of EK GPU blocks, or if I should upgrade? I was looking at the MCP35x. I have already wasted some money trying new things out, so I want the rest to go smoothly. Any suggestions would be welcomed! And I do plan to OC the CPU to around 4.6 and maybe somewhat to the GPUs as well.

Thanks!
post #2 of 10
The pump might suffer a little.

To avoid a high pressure, run the GPUs in parallel and then the pump shouldn't be too much of an issue.


As for the radiators, I would consider getting a 140mm radiator to put on the rear fan and use it with your existing 240.

That will provide a larger surface area (assuming it's the same fin density as what you're using ~ it'll be slightly off, but you get the idea) than getting a 360 rad.

And of course, if you later think you need better temps, you can upgrade the 240 then and use a 360 + a 140.



As for your CPU block, it's frankly one of the best on the market anyway, I wouldn't replace it.



Edit:

Running the GPUs in parallel works like this btw:

    
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post #3 of 10
Thread Starter 
This may be a dumb question, but what do you mean my running them in parallel?
post #4 of 10
Thread Starter 
I am not real familiar with that block, would it be the same as using 2 of these to link the cards?

http://www.sidewindercomputers.com/sliandcr1vid.html
post #5 of 10
Quote:
Originally Posted by yanks8981 View Post
This may be a dumb question, but what do you mean my running them in parallel?
The flow is split between the three cards.

Series:

Water enters card 1 -> Circulates card 1, exits card 1 -> Water enters card 2 -> Circulates, exits -> Water enters card 3 -> Circulates, exits, onto next component.

Parallel:

Water enters all three cards, exits onto next component.

Parallel's what you're going to want to do with three cards. Those fittings you linked will set the cards up in series. The parallel block actually splits the flow between the three cards at the same time.
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post #6 of 10
Yes it's kinda tricky to explain, I couldn't find a picture so I drew some in paint ^-^


This is parallel:



Here the flow is split equally between both cards. so if you think about it like this, the water has to travel from left to right in the card, so if you link all of the left and use that as an input, and link all of the right and use that as an output, the resistance of any one card is the same, so the flow is split equally between the cards and the resistance is divided by the number of cards.

Comparatively, this is series:



Here the coolant must go through one block and then back the other way through the second. While in this case the flow isn't split, the pressure drop across those components is doubled.

It is generally considered better to split the flow than to double the pressure drop, but that depends on the pump. In the case of the rasa pump, it wont cope well with that pressure drop and you could lose too much flow to the loop as a whole.
    
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post #7 of 10
Thread Starter 
I am not against upgrading my pump. If I do stick with the rasa pump, and go with a 240/360 rad + 120 rad + cpu block + 2 gpu blocks, it will be ok with a parallel bridge like this?

http://www.sidewindercomputers.com/ekbrdupa3.html

Do I need anything else besides this link? I will be cooling 2 6950's that are in slot 1 and 3 on the WS Rev board.
post #8 of 10
Quote:
Originally Posted by yanks8981 View Post
I am not against upgrading my pump. If I do stick with the rasa pump, and go with a 240/360 rad + 120 rad + cpu block + 2 gpu blocks, it will be ok with a parallel bridge like this?

http://www.sidewindercomputers.com/ekbrdupa3.html

Do I need anything else besides this link? I will be cooling 2 6950's that are in slot 1 and 3 on the WS Rev board.
For 2 GPUs, you'll need 2 links in addition to the bridge. The links connect the GPU blocks to the bridge. Also, that's a 3-slot bridge. EK also makes a dual-slot bridge. At EK's web site:

http://www.ekwaterblocks.com/shop/bl...-parallel.html
http://www.ekwaterblocks.com/shop/bl...48x0-58x0.html
Edited by elemings - 5/8/11 at 5:06am
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post #9 of 10
Thread Starter 
OK. I appreciate everyones help. So heres my thoughts. I keep my Rasa pump/res, put an RX360 in the top of my case with push/pull with Yate Loon medium speed fans connected to a fan controller, use the parallel EK blocks as suggested above, and everything should be good? Ill be using 7'16 ID 5/8 OD primochill on 1/2 bitspower barbs if that matters.
post #10 of 10
Thread Starter 
I have ordered the 6970 acetal blocks with triple parallel bridge and links (one blanking), and plan to have a couple of quick disconnects in my loop. If I have to upgrade my Rasa pump, I have looked at the following:

http://www.frozencpu.com/products/11...3RJu&mv_pc=619

http://www.frozencpu.com/products/61...3RJu&mv_pc=669

Is this all I need? Whats the difference between the variable speed control and just the normal speed pump? I want this pump to work now, and even if I were to add a 3rd GPU and 2nd Rad.
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