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post #1 of 10 (permalink) Old 01-27-2020, 05:12 AM - Thread Starter
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A Tight Fit

Recently rebuilt my rig into a smaller case (was previously in a NZXT switch 810). I'm pretty happy with how tightly packed this build is (and still runs at acceptable temperatures) and the general aesthetics, but I'm sure there is some constructive criticism out there so posting here.

The loop has 3 runs parallel (CPU, GPUS + Motherboard),
Max temp: 70C (often below)
Ambient : 25C-ish
Idle Water Temp: 31C
Max Water Temp: 42C
(1 hour Stress with Realbench)

4930K (4.3Ghz @ 1.37V)
Rampage IV Black Edition
32GB Gskill Tri X 2400Mhz @ 2133Mhz
2x 780Ti Classified
AX1200i
850PRO 500GB boot + other ssd
Corsair Carbide Air 540

D5 Vario
Singularity: Res / Pump top / connector / mount
XSPC 240 + 360 50mm RADS
EK blocks on CPU, GPU's, VRM and Southbridge
4x Corsair SP120 (5 fans but 1 not working)
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Last edited by anti-clockwize; 01-27-2020 at 05:15 AM.
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post #2 of 10 (permalink) Old 01-27-2020, 06:45 AM
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Wow...yea that’s a really tight fit. I thought I had it bad with mine.

What made you decide to go with three separate loops?

Another idea is - you could clean it up by going hardline, but that’s only gonna help with aesthetics.


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post #3 of 10 (permalink) Old 01-27-2020, 08:38 AM - Thread Starter
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Quote: Originally Posted by Pinnacle Fit View Post
Wow...yea that’s a really tight fit. I thought I had it bad with mine.

What made you decide to go with three separate loops?
Just wanted to give it a go, see what happened. Didn't really plan the build, but did have in mind from the start I wanted to experiment with 3 parallel. I guess when you look at rudimentary calculations it's theoretically better, and I figured if i could keep the runs as short as possible they would all be similar lengths and there wouldn't be slow lane. From what I can tell all 3 are flowing at a decent speed, CPU and GPU's are acceptable for voltage and the motherboard loop has almost no restriction so it is probably flowing the fastest.

Quote: Originally Posted by Pinnacle Fit View Post
Another idea is - you could clean it up by going hardline, but that’s only gonna help with aesthetics.
Yeah I did think about hardline but decided I couldn't be bothered for this system (aging a bit) and already had the tubing. Tried to do the runs with little slack to give a hardline-ish look, though.
Next build might go hardline! Got my eye on a 3950X

edit: I think the tube thickness is largish part of the problem with the aesthetics...
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post #4 of 10 (permalink) Old 01-27-2020, 08:43 AM
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Thing is...I recall from martin’s liquid lab that parallel doesn’t work well compared to series because as soon as it encounters resistance, it’ll find an alternate route, rather than forcing the flow through the restriction.


https://www.google.com/amp/s/martins...-parallel/amp/


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post #5 of 10 (permalink) Old 01-27-2020, 09:09 AM - Thread Starter
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Quote: Originally Posted by Pinnacle Fit View Post
Thing is...I recall from martin’s liquid lab that parallel doesn’t work well compared to series because as soon as it encounters resistance, it’ll find an alternate route, rather than forcing the flow through the restriction.


https://www.google.com/amp/s/martins...-parallel/amp/
Agreed, but I suppose there is some tolerance, if one loop had very high restriction it may come to a standstill, but if one loop has only marginally more restriction it will still flow.
I had seen that information before about restrictions in parallel, so I was aiming to make each loop as short as possible, with as few hard turns as possible. That was also the reason I put the GPU's in parallel, I was worried that if they were in series that might be enough restriction to stop that loop flowing all together. One GPU maxes out around 50*C and the other at around 55-57*C after an hour of realbench stress test.
The motherboard blocks don't have fins, so very low restriction, so there are some hard bends in that loop, but probably compensates for the fins in the GPU and CPU blocks.

edit: Can definitely confirm all three loops are flowing, did this build a while ago and using it daily. 4 fans are keeping it cool, all at 40%. Also with a previous serial loop, the flow rate (with dual d5's) was not enough to keep that visual flow rate thingo spinning all the time (had to tap it to make it spin sometimes). Now it spins constantly and so fast it makes a noise.

Last edited by anti-clockwize; 01-27-2020 at 09:14 AM.
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post #6 of 10 (permalink) Old 01-27-2020, 09:15 AM
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Quote: Originally Posted by anti-clockwize View Post
Agreed, but I suppose there is some tolerance, if one loop had very high restriction it may come to a standstill, but if one loop has only marginally more restriction it will still flow.

I had seen that information before about restrictions in parallel, so I was aiming to make each loop as short as possible, with as few hard turns as possible. That was also the reason I put the GPU's in parallel, I was worried that if they were in series that might be enough restriction to stop that loop flowing all together. One GPU maxes out around 50*C and the other at around 55-57*C after an hour of realbench stress test.

The motherboard blocks don't have fins, so very low restriction, so there are some hard bends in that loop, but probably compensates for the fins in the GPU and CPU blocks.



Can definitely confirm all three loops are flowing, did this build a while ago and using it daily.


That’s interesting. It kinda flies in the face of what I thought to be the case.

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Last edited by Pinnacle Fit; 01-27-2020 at 09:20 AM. Reason: Clarification.
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post #7 of 10 (permalink) Old 01-27-2020, 09:43 AM - Thread Starter
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Quote: Originally Posted by Pinnacle Fit View Post
That’s interesting. It kinda flies in the face of what I thought to be the case.
Yeah same, I fully expected it to fail, was ready for a 100*C GPU or CPU. I kinda expected the Top GPU to run pretty hot, i thought the water through it would be very slow, but seems ok.
If i had to say, I think the GPUs are running a little hotter than in the previous serial loop, maybe by under 5*C bottom card and around 5*C on top card.
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post #8 of 10 (permalink) Old 01-27-2020, 09:50 AM
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Quote: Originally Posted by anti-clockwize View Post
Yeah same, I fully expected it to fail, was ready for a 100*C GPU or CPU. I kinda expected the Top GPU to run pretty hot, i thought the water through it would be very slow, but seems ok.

If i had to say, I think the GPUs are running a little hotter than in the previous serial loop, maybe by under 5*C bottom card and around 5*C on top card.


Yea the fact that it’s running hotter is consistent with what I thought would happen. Have you considered using a pump with a higher head pressure like a DDC? Cpu and two gpu shouldn’t be an inordinate restriction. Honestly if you did two DDC in series you’d have no flow issues I would think.


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post #9 of 10 (permalink) Old 01-27-2020, 09:51 AM
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A Tight Fit

Also it 5-10C between the two cards seems like a lot TBH.

Also I took another look at your setup and your overall temps look consistent with what I would’ve figured given what all you have in the loop.

You did a good job with it, considering the limited space.

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Last edited by Pinnacle Fit; 01-27-2020 at 10:03 AM.
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post #10 of 10 (permalink) Old 01-27-2020, 12:08 PM - Thread Starter
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Quote: Originally Posted by Pinnacle Fit View Post
Also it 5-10C between the two cards seems like a lot TBH.

Also I took another look at your setup and your overall temps look consistent with what I would’ve figured given what all you have in the loop.

You did a good job with it, considering the limited space.

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Yeah I'm not sure if it can be considered a success for anything more than having sufficient flow in all runs to be usable. I don't think it proved anything in the way of advantages in parallel loops.
But, while the GPUs are running a touch hotter, the cpu is running considerably cooler, I used to push 90's at the end of a realbench stress test. Perhaps the highest flow is through the cpu path.
And Thanks, just glad that i haven't had to pull it apart yet! Thanks for ur comments.
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