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Dual loop or single?

post #1 of 7
Thread Starter 
So I'm going to throw a ball at you guys, hoping for a good response. I've got this new rig I'm building, and I plan to put the CPU and GPUs underwater, mostly because one of the GPUs has a derped fan and I am too lazy to install a new fan. As of right now I've got a dual loop in mind, and here are the details:

Loop One: CPU
  • Bitspower Water Tank Z-Multi 150
  • Swiftech MCP355™ 12 VDC Pump
  • XSPC RX240mm rad (up top, for CPU - could I fit a 360 in there if I didn't have a drive up top?)
  • EK Supreme HF
  • EK G1/4" Black Nickel (as many as I need)
  • Feser UV Red and Feser UV White 3/8"
  • Cooler Master Sickle Flows (red)x2

Loop Two: GPUs
  • XSPC X20 750 res/pump
  • XSPC RS360mm rad (external)
  • EK FC6870 - Acetal + Nickel)x2
  • EK FC Bridge Dual
  • EK G1/4" Black Nickel (as many as I need)
  • Feser UV Red and Feser UV White 3/8"
  • Lamptron Fan-Atic Controller
  • Cooler Master Sickle Flows (red)x3

I'd love to get feedback on what I've got proposed, and I'd love to have help choosing fittings. I'm not really sure what I want to do with those as I have no idea how it will ACTUALLY look in the case, and I don't know at what angles I'll have every tube going in through, so I'll probably just get non angled fittings and call it good until I see fit to change that. The Phantom itself has a fan controller, and depending on how things go I'll just stick with it, but I don't think it can push as much power to the fans as an aftermarket could. Anyway, it'd be awesome if you guys could look over that and let me know if there are ways I can cut costs and improve on designs. I am pretty sure I'm going to be going res-pump-rad-blocks, since that's the easiest, but I know some people do it differently.

Rig this is being used on is my second sig rig.
Edited by Lazy Bear - 2/6/12 at 11:10am
 
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post #2 of 7

Let me address the title issue (dual loop vs single loop) before addressing the components chosen.

 

Gabe, CEO of Swiftech, has done an extensive study of this subject (with i7 920 and two GTX470s).  His conclusion is:-

 

 

Quote:
Under extreme performance scenarios, and from a pure performance standpoint, dual loops versus single loop are neither better nor worse, under the strict condition that the load ratios are evenly balanced.
Under the most commonly encountered loads though, single loops do win.

Under both of the above use scenarios, single loops also win from a reliability standpoint because of pump redundancy.

The choice is yours to make.


(Complete White Paper here:- http://www.swiftech.com/whitepapers.aspx)

 

So, I suggest a single loop.

post #3 of 7
That maybe so but doing two loops is ALOT more fun
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post #4 of 7
single loop. This way you can drop the xspc pump out of the loop and just use the 355 which is about 10x more reliable of a pump.

Also, its a good idea to plan your loop out very carefully. Physicall install the parts, then grab some tubing and see if it can make the bends and let that be your deciding factor on angled fittings. Alot of times angled fittings arent needed, just depnds on the set up.
Edited by AliceInChains - 2/6/12 at 5:49am
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post #5 of 7
I run a 980x and (2) 470's on a 360 rad with extreme fans/controller. Only Witcher2 gets it to 50c mid summer in Hotlanta.
post #6 of 7
Thread Starter 
I think I am worried of one loop having enough water and pushing power for both cards and the CPU. I may be asking some exponentially nooby questions, but regarding reservoirs, do sizes count? Am I going to have enough water with the XSPC X20 750 to run the water blocks? Where do I go with the loops from the blocks? Back to the res and/or pump?
 
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post #7 of 7
I think that MCP355 has like 3.5 meters of head pressure. Plenty for only 3 blocks and two rads.

Res size does not matter, it's a matter of looks. Sure more water in the tank means it takes longer for the water to heat up, but who cares right? It only severes to help you bleed the loop. You could do it with a simple T-Line.

I would ditch the 720 pump and use the small Bitspower res with the MCP355 in a single loop.
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