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Why does my loop get so hot? - Page 2

post #11 of 18
Thread Starter 
Quote:
Originally Posted by Kokin View Post

15C delta seems right for your setup. Setting fans to push should improve the Delta by another 1-2C. That's probably the limit of your cooling due to very low fan speed.

I never asked but what speed is your pump running at? You should also expect the Pastel coolant to run about 1-2C higher than if you just used distilled water.
I'm running the pump at 1 to keep it as quiet as possible. I also tried at 5 to get as big of a difference in pump speed as possible and it made no difference, the numbers are in the OP.

Quote:
Originally Posted by pc-illiterate View Post

sorry philly but that math doesnt work like that. people showed jacknaylor it doesnt work and im betting thats why he hasnt been around.

the primo doesnt get great airflow through the bottom for max capacity rad. it works but higher rpm fans run short of air. dont bother arguing with me. its been proven and i dont care enough to go find where. if you care, you go look.
2x 480 rads is more than any cpu and single gpu will ever need to stay cool with even 1 rad having fans. exhausting through a rad with air being warmed already by an intake causes exactly what you see with your temps. you have overkill radiator area and, for the loop components, bad temps. this shouldnt be a surprise.
Sorry, I don't follow. You say that I have overkill radiators and that the components should stay cool even if only one of the radiators had fans, yet it shouldn't be a surprise that the temps are high? I did change the top radiator to intake instead of exhaust, and it helped a good deal, but it's not quite where I want it to be.
post #12 of 18
yeah my post was aimed at everything before you changed both rads to intake.
yes the temps would be high, and should be, when you intake through a rad and then exhaust that air out another rad in the loop, inefficient.
you are not going to get cooler without ramping up the pump and rad speeds and/or using push/pull on both rads. 15*C delta with fans spinning at 800rpm is pretty much where you should be. 21*C ambient and slow rpm fans.
i dont know what your voltage to those pure wings would equate to but at 7v they only push roughly 12cfm through an h80 rad. it might hit 15cfm on an 8-11fpi rad compared to the h80 having 19-21 fpi. its a good rad fan but those rpm is what is limiting you.
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post #13 of 18
Increasing fan speed is your best bet for lower temps and moving the pump speed setting to at least 2-3 for an incremental improvement. Without turbulent movement, your coolant cannot exchange heat effectively due to low flow and/or head pressure.
    
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post #14 of 18
Thread Starter 
Quote:
Originally Posted by pc-illiterate View Post

yeah my post was aimed at everything before you changed both rads to intake.
yes the temps would be high, and should be, when you intake through a rad and then exhaust that air out another rad in the loop, inefficient.
you are not going to get cooler without ramping up the pump and rad speeds and/or using push/pull on both rads. 15*C delta with fans spinning at 800rpm is pretty much where you should be. 21*C ambient and slow rpm fans.
i dont know what your voltage to those pure wings would equate to but at 7v they only push roughly 12cfm through an h80 rad. it might hit 15cfm on an 8-11fpi rad compared to the h80 having 19-21 fpi. its a good rad fan but those rpm is what is limiting you.
Okay, thanks for the input.
Quote:
Originally Posted by Kokin View Post

Increasing fan speed is your best bet for lower temps and moving the pump speed setting to at least 2-3 for an incremental improvement. Without turbulent movement, your coolant cannot exchange heat effectively due to low flow and/or head pressure.
I did try increasing the pump speed from the lowest setting all the way to the highest and saw no difference whatsoever in temperatures.
post #15 of 18
Yes hence why I said incremental. Higher pump speed helps keep the rate of exchange of heat at an optimal level once you are at a high load state. You cannot see the difference over a few seconds but rather throughout the hours of usage. Sounds vague and stupid but that's how it works. Think of it as acceleration vs velocity.
    
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post #16 of 18
Thread Starter 
Quote:
Originally Posted by Kokin View Post

Yes hence why I said incremental. Higher pump speed helps keep the rate of exchange of heat at an optimal level once you are at a high load state. You cannot see the difference over a few seconds but rather throughout the hours of usage. Sounds vague and stupid but that's how it works. Think of it as acceleration vs velocity.
Well, I tried increasing the fan speed to 1300 RPM on the radiators and 750 RPM on the case fans, which got me a delta temp of 9.5C. Definitely not worth it for me with that drop compared to 800 RPM considering the massive increase in noise levels. Once again I tested with the pump at 1 and at 5 and saw no difference in temperatures whatsoever. I let it run for probably 20 minutes with the maxed pump speed after the temperatures settled with the pump at 1 and the fluid temperature did not move even a tenth of a degree. I don't know how long you'd want it to run to see any difference, but as is I don't believe it matters in my loop. I do only have two blocks.

EDIT: While it doesn't appear to have any relevance for the fluid temperature, I've noticed that the GPU temp goes up and down almost immediately when I change the pump speed. The difference between speeds 1 and 5 is 3C, and like I said it changes within a few seconds.
Edited by versions - 6/21/16 at 6:58pm
post #17 of 18
I would increase the pump speed. That'd be the first thing I'd do in fact. A setting of 1 on a D5 with two 480's and two blocks isn't enough. Especially if you're using angled fittings. I'd imagine it's barely moving. I have a loop with one 240 one 360 two blocks and a lot of fittings and I'm constantly surprised at how much slower the water moves compared to an older system using the same pumps but barbs instead of fittings.

Again I don't know what kind of tubing/fittings you are using to me but having just completed my first hardline build Ive been very surprised at how much restriction I've added just with the bends and 90's even compared to loops I've had with more blocks and some 90s but with soft tubing.

This is just me using my eyes of course and on my stuff but I'd turn that pump up.
    
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post #18 of 18
It's interesting that turning your pump from 1 to 5 makes no difference.

I've not run the calc based on radiator performance, so I may be wrong, but just going off gut feeling a dT of 15°C still seems a little high given the large surface area of your radiators. I know every system is different, but for comparison I'm running slightly less heat load on 480mm of rad space total, and I get a lower air-water delta than that (~7-8°C) with my fans at 800-1000 rpm.


The first, most basic thing I can think of is that you may have an air bubble trapped somewhere, most likely the top radiator. That would restrict the flow going through the radiator, negating the impact of increased pump speed, and would also cause high air-water dT.

I know I may be telling you to do something you've already done here, but try making sure that the loop is fully filled with liquid. Run the pump and pick the case up, rotate it gently (making sure that your pump never sucks air), and try to imagine how the air would escape upwards as you do so.
Edited by GingerJohn - 6/22/16 at 2:07pm
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