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Pump for external rad

post #1 of 7
Thread Starter 
Looking at adding an external radiator to my box. Something link the Phobya or Danger Den mounting kit. The housing will likely be above my computer (since I have a toddler in the house) and I'm thinking either a single triple or two doubles. First, just through a CPU block, but likely adding a GPU block in the future.

So, will any pump work well enough for what I'm asking of it? I'm tempted to start with the 240 RX rasa kit and add a second 240 to it, but I'm a little worried about that pump keeping up. Should I do something else or add another pump in line?

Thanks for the thoughts.

Oh and it would be on the sig rig.
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post #2 of 7
i use the mcp-655 for my loop. my computer is on the floor and rad is in the window, so maybe like 4ft up or so.
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post #3 of 7
I believe bitspower makes a special dual D5 pump for running multiple Rads. here is a link: http://www.frozencpu.com/products/11...tl=g30c107s156
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by DSP1 View Post
I believe bitspower makes a special dual D5 pump for running multiple Rads. here is a link: http://www.frozencpu.com/products/11...tl=g30c107s156
That sure looks nice, but with a pair of D5's looking at over $250. A little high - does look like it might mount in a pair of drive bays though.

Quote:
Originally Posted by bobfig View Post
i use the mcp-655 for my loop. my computer is on the floor and rad is in the window, so maybe like 4ft up or so.
Is your's stock (no special top mods). And what's the loop it's going though? Thanks!
Edited by beldecca - 10/25/11 at 9:32am
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post #5 of 7
my loop is res -> mcp-655 -> RX360 -> swiftech gtz -> koolance vid-nx480 -> res. i do have 2 quick disconnects between the rad and the computer so that i can leave the rad in the window and move the computer to work on it.
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post #6 of 7
As bizarre as it sounds it actually doesn't matter how much higher your rads are than the rest of your loop. This is because as water falls from the rad back to the loop it draws water up the other side into the rad. Because of this the water in the loop can be considered essentially weightless. Have a look at the siphon for an example of this effect.

What does cause problems though is the tubing length and initial filling / bleeding. Once the loop is full then the pump only has to overcome flow resistance, which is where tubing length becomes an issue, however when filling the loop the pump has to lift the water up to the rad somehow. You might consider having a sealable fill port at the top of the loop to help with this, otherwise your pump isn't going to cope.

So you should be OK with any reasonable pump. Sadly the X2O-750 isn't all that good, and might have problems coping with the added restriction of the longer tubing and extra rads. Something like a MCP350/355/35x/655 or equivalent will be fine.

Edit: You can always put two weaker pumps in series, but the cost is probably greater than getting a single, more powerful, pump.
Edited by GingerJohn - 10/25/11 at 10:00am
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post #7 of 7
Thread Starter 
Sounds like the best way might be a d5 based system and by pass the Rasa kit entirely and just go fully custom.

So, with that in mind, this is the stand I'm looking at:

with a pair of 240mm's (the new XSPC EX240 are $50 ea) and a d5 pump / res combo and quick connects so, as bobfig said, you can work on the two independent. Might go with swiftech blocks with their universal GPU blocks.

This pump top / res should be fine:


and of course a bunch of fans

Thanks for help. Always listen to any additional thoughts.
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