To Much On One Loop/Pump?

[Matt_Rapp]

I am going to water cool my current rig this summer once I have the $$$ and I plan on using these WC parts in an 930 + dual crossfire set up with 1/2" tubing and Bitspower fittings.

1 Danger Den/Laing DDC 3.25 -12V 18 Watt Version
1 Alphacool Laing DDC Clear Acrylic Top

1 Swiftech Apogee XT
2 EK-FC5770

1 Feser XChanger Triple 120mm Xtreme Performance Radiator
1 Koolance Reservoir

I also am making a custom flow indicator out of acrylic but I am going to put it on a split off 1/4" loop so it shouldn't add that much resistance.

I am just worried about my flow being to low or having to high of temps, so I see three options:

1) Don't worry about it, one loop
Pump>CPU>GPU>GPU>Radiator>(split off for Flow Indicator)>Reservoir

2) Get another pump and a dual pump top and have the same set up as in 1

3) Get another pump and have two loops with a shared Radiator and Reservoir
Pump 1>CPU>(split off for Flow Indicator)>Radiator>Reservoir
Pump 2>GPU>GPU>Radiator>Reservoir

I'd rather not spend the extra money on a pump but I'd deal with the extra cost and complexity to get good temps and flow rates. I don't want to add a second radiator because that would involve modding the bottom of my 800D or having a 2x140 hanging externally from the back. I could add a single 140 radiator but I don't think it could handle the GPU's or CPU on its own. Also the Reservoir has 4 independent ports so splitting the line wouldn't be that hard, I would only need a T to go into the radiator.

What do you think?

 

[weuntouchable]

You should be fine. A triple radiator can cool a i7 and two 5770s.

 

[spine]

I use a 22" x 17" full sized car radiator and my old, weak, and low pressure head Eheim 1046 ran it with a restrictive DangerDen RBX and gpu block no problems once all the air was removed. It's surprising how much power you don't need. I moved to an Eheim 1250, then finally to a Laing DDC Ultra (18w, same as you're eyeing up). I can't honestly say there has been really that much improvement over all of them. Seriously.

It's only really extreme overclocks with extreme voltages that demand super pressure for super flow rates.

I think you'll be fine with that Laing 18W absolutely no troubles.