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[Sponsored]Project Thief - COMPLETED 11/13/2014 - 2 CPUs, 8 GPUs, 4 Loops, 6 Pumps, 50+ Fans, 2TB SSD - Page 169

post #1681 of 3824
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Quote:
Originally Posted by Electrocutor View Post

So how do you have the Iwaki hooked up in your flow? It could easily drive two parallel loops at high pressure between 12 and 24 volt, three between 18 and 24; as long as you use some valves to keep each of the parallel flow pressures even.

Yup I was trying for all out performance. It only runs the CPU and GPUs which use an EK parallel bridge. Those are in series. Because of the GPUs being in paralel it's going to be extremely high flow as the cpu block is also pretty unrestrictive - which means the radiators would be better off in parallel. If I don't have the splitters for it though they may have to be in series for now and maybe I'll run the Iwaki at 12V temporarily. That way I'll also be able to paint the 24V supply. Once I'm done I'll reuse my bitspower Q fittings as 3 way splitters for the radiators and bring the 3rd rad into the loop thumb.gif
     
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post #1682 of 3824
Quote:
Originally Posted by stren View Post

Yup I was trying for all out performance. It only runs the CPU and GPUs which use an EK parallel bridge. Those are in series. Because of the GPUs being in paralel it's going to be extremely high flow as the cpu block is also pretty unrestrictive - which means the radiators would be better off in parallel. If I don't have the splitters for it though they may have to be in series for now and maybe I'll run the Iwaki at 12V temporarily. That way I'll also be able to paint the 24V supply. Once I'm done I'll reuse my bitspower Q fittings as 3 way splitters for the radiators and bring the 3rd rad into the loop thumb.gif

Just remember that flow through most micro-channel water blocks start to lose heat transfer around 1.8gpm, so going higher than that wouldn't be a good idea. The criss-cross and peg type water blocks cap out a bit sooner than that. I think most radiators are fine until about 3 or 3.2gpm before they start losing performance: they're a lot more dependant on design for exactly where it starts being an issue though so you'd have to play with flow rate to see when your deltaT is lowest.


Maybe consider something like this?
Code:

        <---------.
   (res)<----.    |
     |       |    |
     v       |    |
   (pmp)     |    |
     |       |    |
  .--+--.    |    |
  |     |    |    |
  v     v    |    |
(rad) (rad) (x)A  |
  |     |    |    |
  v     v    |    |
(rad) (rad)  |    |
  |     |    |    |
  +-----+----'    |
  |     |         |
  v     v         |
(cpu)  (x)B       |
  |     |         |
  v     |         |
(ram)   |         |
  |     |         |
  v     |         |
(etc)   '-----.   |
  |           |   |
  +-----+-----+   |
  |     |     |   |
  v     v     v   |
(gpu) (gpu) (gpu) |
  '-----+-----'   |
        '---------'

This would let you set valve A to let you lower your deltaT and B to whatever your CPU block likes best for flow rate without hampering GPU flow.

You'd want to use something like this (http://www.frozencpu.com/products/2278/ex-tub-17/12_ID_UV_Reactive_Leakproof_Y_Fitting.html?tl=g30c499s639) after the pump instead of a T because the water there would be ridiculous.
Edited by Electrocutor - 8/22/12 at 8:51pm
post #1683 of 3824
Thread Starter 
Quote:
Originally Posted by Electrocutor View Post

Just remember that flow through most micro-channel water blocks start to lose heat transfer around 1.8gpm, so going higher than that wouldn't be a good idea. The criss-cross and peg type water blocks cap out a bit sooner than that. I think most radiators are fine until about 3 or 3.2gpm before they start losing performance: they're a lot more dependant on design for exactly where it starts being an issue though so you'd have to play with flow rate to see when your deltaT is lowest.
Maybe consider something like this?
Code:
        <---------.
   (res)<----.    |
     |       |    |
     v       |    |
   (pmp)     |    |
     |       |    |
  .--+--.    |    |
  |     |    |    |
  v     v    |    |
(rad) (rad) (x)A  |
  |     |    |    |
  v     v    |    |
(rad) (rad)  |    |
  |     |    |    |
  +-----+----'    |
  |     |         |
  v     v         |
(cpu)  (x)B       |
  |     |         |
  v     |         |
(ram)   |         |
  |     |         |
  v     |         |
(etc)   '-----.   |
  |           |   |
  +-----+-----+   |
  |     |     |   |
  v     v     v   |
(gpu) (gpu) (gpu) |
  '-----+-----'   |
        '---------'
This would let you set valve A to let you lower your deltaT and B to whatever your CPU block likes best for flow rate without hampering GPU flow.
You'd want to use something like this (http://www.frozencpu.com/products/2278/ex-tub-17/12_ID_UV_Reactive_Leakproof_Y_Fitting.html?tl=g30c499s639) after the pump instead of a T because the water there would be ridiculous.

Thanks. In testing so far I've seen the opposite: CPU blocks still making gains at 2.6gpm (some taper off there, while others look like they have more to gain) while radiators seem to lose performance before that point. This loop isn't that complicated as there is no ram or motherboard block as they will get their own loop. As the temps are normally more of a concern on the CPU than the GPU, I was planning on running max flow through it. I'm not expecting any performance hit as I know the Iwaki @29V can only hit 3.5gpm with one cpu block and one rad. With the extra GPUs and fittings, it'll probably drop to ~3gpm. That means each GPU and radiator will also get a good 1gpm. I'll do some testing to see if dropping that gets me any improvements in case but I'm expecting higher flow to be better for now.
     
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post #1684 of 3824
That's very interesting: will you have all your info written up in your CPU block comparison thread eventually?

I had been looking at this from Skinnee Labs:
post #1685 of 3824
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Quote:
Originally Posted by Electrocutor View Post

That's very interesting: will you have all your info written up in your CPU block comparison thread eventually?
I had been looking at this from Skinnee Labs:

Yup it will be in my waterblock roundup thread eventually. A lot of those blocks are older designs - if you look at some of his more recent data it looks very similar to what I've seen:

370TempvsFlowMX2.png

I haven't found a block yet (I've only tested half of them though vs flow) that doesn't improve up to 2.6gpm. However skinnee/vapor was able to test at higher pressures/flows than I was (my test bench uses a mcp35x2 as it gives me finer flow control than the Iwaki does). So it may be that I'll need to turn it down from the might 29V setting thumb.gif
     
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post #1686 of 3824
looks pretty insane ! thumb.gif
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post #1687 of 3824
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PSU arrived smile.gif Normally the UPS man would have come at 3 which would give me some time to get some work done. Photos and videos to come later thumb.gif
     
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post #1688 of 3824
Quote:
Originally Posted by stren View Post

PSU arrived smile.gif Normally the UPS man would have come at 3 which would give me some time to get some work done. Photos and videos to come later thumb.gif
wheee.gif
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post #1689 of 3824
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Originally Posted by morencyam View Post

wheee.gif

Haven't had time to do much but make a quick and dirty unboxing video. I have much to catch up on.
     
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post #1690 of 3824
Quick and dirty, just how I like it.
It's a beast biggrin.gif
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