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Loop order: help me choose

post #1 of 12
Thread Starter 
Here are the two loops I am considering

Fair warning though: I don't have a PhD in thermodynamics or anything like that so what I wrote below might as well be totally misinformed/wrong. Just point it out and I'd be glad to have asked smile.gif

FIRST LOOP
First one is what I would call "best bleeding"
The rationale for this is, the pump is going straight for the most restrictive parts situated at the top of the case, right at the beginning: CPU and 360 rad.
The water pressure is still strong so those bubbles should get flushed pretty quickly around that area.

Then, the pressure drops after having gone through another rad (120mm at the back), those two GPUs and another rad (140mm at bottom).
Should there still be any air bubbles now, they cannot possibly go back the way they came (because of the water flow)
I expect that by the time the water (and potential air bubbles) reach the bottom radiator, the air bubbles cannot get stuck since the flow will naturally lead everything back to the reservoir at the top, concluding the bleeding.

res/pump -> CPU -> 360mm -> 120mm -> GPUs -> 140mm -> res/pump.
587


SECOND LOOP
Second loop would be something more "balanced"
Basically, there's always a rad between each source of heat (CPU, pump, both GPUs count as one).

What I'm afraid of: air bubbles getting trapped around the 120mm rad/CPU (they might not be on the same level/height)
Also, by the time the water/air bubbles reach the 360mm radiator, pressure has dropped significantly and because the reservoir and the 360mm radiator are on the same level, air bubbles have a much higher chance of getting stuck there. I'd have to tilt the case backwards each time I bleed it.

res/pump -> 140mm -> GPUs -> 120mm -> CPU -> 360mm -> res/pump.
587

What do you think ? Am I thinking too much ?
Should I go with the first or second loop ? Bonus third loop ?
post #2 of 12
I personally would put CPU before GPU's as GPU's as far as I understand are designed to tolerate higher temps in the first place and for the second, tend to run a lot cooler under the water than CPU.

But as you have already rads between the components I dont think there is any real world difference between the loops. Then again I'm a little weak on practice side of things so far as I'm still waiting for my parts to arrive for WC wink.gif
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post #3 of 12
all you need is a 360 rad and a 120.
plus you can just do one loop.
loop order really doesnt matter. the loop will reach an equalibrium
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post #4 of 12
360 might be a bit useless if it only gets warm air from 120 and 140 rads.
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post #5 of 12
I forgot to mention I would add fans on your side window to get more airflow in this case too
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post #6 of 12
I think you should change your loop order. Res/pump, video cards, 360 top rad, cpu, 120 rad, res/pump. With your present loop order and rear fan air direction when your gpus get crankin you are going to be loading up the interior of your case with a serious amount of heat. I really don't thank a 140 rad in the bottom of the case is necessary. How about mounting a 140mm fan in the bottom of your case to supply more fresh air into the interior of your case? Also put the fan on the 120 rad to blow out of the case instead of in.
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post #7 of 12
Quote:
Originally Posted by division2 View Post

I think you should change your loop order. Res/pump, video cards, 360 top rad, cpu, 120 rad, res/pump. With your present loop order and rear fan air direction when your gpus get crankin you are going to be loading up the interior of your case with a serious amount of heat. I really don't thank a 140 rad in the bottom of the case is necessary. How about mounting a 140mm fan in the bottom of your case to supply more fresh air into the interior of your case? Also put the fan on the 120 rad to blow out of the case instead of in.

having just a 120 for the cpu is a bad idea especially if he wants to overclock.
I had a 480 for cpu and 5970, 5870 in one loop my cards never hit past 45 on full load. that is with everything ocd to.
res-pump-rad-cpu-gpu-gpu is how I did my loop
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post #8 of 12
Thread Starter 
Thanks for the feedback.

I'm going more rads than necessary because I like overkill smile.gif
And yes this is a single loop.
Quote:
Originally Posted by mm67 View Post

360 might be a bit useless if it only gets warm air from 120 and 140 rads.

Not sure I understand.
Most setups I've read, people put their rad on top, blowing air out.
Whatever happens, the air is going to come from inside the case where the temperature is higher than ambient, right ? Or did I misunderstand something ?
Quote:
Originally Posted by division2 View Post

I think you should change your loop order. Res/pump, video cards, 360 top rad, cpu, 120 rad, res/pump. With your present loop order and rear fan air direction when your gpus get crankin you are going to be loading up the interior of your case with a serious amount of heat. I really don't thank a 140 rad in the bottom of the case is necessary. How about mounting a 140mm fan in the bottom of your case to supply more fresh air into the interior of your case? Also put the fan on the 120 rad to blow out of the case instead of in.

The bottom 140mm fans in push/pull are supposed to get some fresh air in. Granted, they do go through a radiator but shouldn't that be enough ?
That's also the reason I put the back 120mm fan to blow some air inside the case: bring fresh air in and try to create a balance between air intake/outtake (and I read that's a good thing to do)
Eventually, all the hot air is going to rise and go through the 6 fans sitting on top.
Quote:
Originally Posted by Juggalo23451 View Post

I forgot to mention I would add fans on your side window to get more airflow in this case too

I'll try to see if I can mod the side window but unfortunately, I'm not very good at those things...

So far, if I read correctly, you guys mean that I should ditch either the bottom or back radiator, only to leave a fan ?
post #9 of 12
Quote:
Originally Posted by Gauvi View Post

Thanks for the feedback.

I'm going more rads than necessary because I like overkill smile.gif
And yes this is a single loop.
Quote:
Originally Posted by mm67 View Post

360 might be a bit useless if it only gets warm air from 120 and 140 rads.

Not sure I understand.
Most setups I've read, people put their rad on top, blowing air out.
Whatever happens, the air is going to come from inside the case where the temperature is higher than ambient, right ? Or did I misunderstand something ?

Air inside case is naturally warmer than ambient air but if intake air is coming through other radiators then it might get so warm that top rad can not cool the water anymore. Radiator can only cool water if it's intake air is cooler than water.
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post #10 of 12
Thread Starter 
Ok I'll probably ditch the bottom rad in that case. I can feel a pretty cold airflow in my room most of the time (and my feet do get pretty cold because of that...) so I'll take advantage of it.
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