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MCP35x Restriction Question

post #1 of 12
Thread Starter 
I am aware of the power this pump has along with the heat it can put out. I know many people in the past have ran full speed on non restrictive loops which can easily burn out the pump.


Asking for opinions and feedback.

I installed new loop this weekend;
cpu, gpu, southbridge, vrm/mosfets
The full loop runs all these blocks, 2 480x45mm rads, 250mm res, and approx 6ft of tubing

I do notice I can run the rpm on lowest speed (~1500rpm) and have decent temperatures on both cpu and gpu

When cranking the synthetics to test gpu or cpu I noticed;
pump at ~3000rpm ~2-4C off the gpu, not much off the cpu
pump at ~4500rpm ~3-5C off the gpu, not much off cpu
(currently trying 3500 and 4000, still not sure if too much rpm)

Would you say it's safe for me running full speed on this MCP35x for the loop I have? I do have the heatsink and fan combo installed under the MCP35x as well, I am just not sure if my loop has that much restriction. Last thing I want to do is burn out the pump frown.gif
  
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post #2 of 12
I think you should be fine. I'm using an MCP35X2 (same pump as you, just 2 of them in one housing) and ran it at full speed for about 4 months through 4 GPU blocks and a cpu block. I've since removed 2 of the gpu blocks from the loop and turned the pump speed down but it's still humming along just like it was on day 1.

I really think it's only cause for concern if you have 1 block in your loop or something similar (the only time I even see it brought up are usually when somebody is running two separate loops for CPU and GPU and thus has only a single CPU block in one loop).

Given that you also have chipset and MOSFET blocks, I think you easily have more restriction per pump than I did and as I said, no issues whatsoever for me.
post #3 of 12
Thread Starter 
thanks ShoehornHands smile.gif
I was thinking I have a decent amount of restriction, that 4500rpm on the mcp35x is so strong I didn't want to only guess biggrin.gif
  
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post #4 of 12
Its fine. Pumps only get really warm at over 2GPM so unless you are running those blocks in parallel then the flow rate isn't going to be anywhere near that.
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post #5 of 12
Thread Starter 
Quote:
Originally Posted by Jakusonfire View Post

Its fine. Pumps only get really warm at over 2GPM so unless you are running those blocks in parallel then the flow rate isn't going to be anywhere near that.

This makes me wonder about the kink I have in my cpu tubing, I can't get the best camera angle but I tried to do a rounded tube instead of 45's and short tubing

my water temps get ridiculous with the 780ti kpe and cpu under load when I test the system

I am a bit confused on how 2 480x45mm rads and gt ap-15's running 1850rpm can not keep me under 10C





  
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post #6 of 12
Do you mean that twin 480's aren't keeping your water delta under 10C cooling a single card? If so that is very strange. My card isn't a king but the power level isn't that different. My delta hovers around 10C when playing BF4. Thats a 240 + 360 with fans at 1300 RPM. At full system load its about 12.5C. I cant compare with similar fan speeds cause I have gone all low speed fans now.

How is your airflow? Sealing around the edges of rads and fans can make a significant difference.
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post #7 of 12
If the housing on the MCP35x is too hot to hold your fingers on, it's probably too fast @ that restriction, if you can hold your fingers there it won't burn out. That's the primitive method I've been using and mine are fine. Makes sense that your GPUs favor high flow, CPU blocks are designed to create their own turbulence via center injection and narrow lanes, GPUs are designed to have relatively low restriction and to run decent at low flow because of the fact most high end systems w/liquid cooling will have multiple blocks in either parallel or serial.
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post #8 of 12
Thread Starter 
Quote:
Originally Posted by ZytheEKS View Post

If the housing on the MCP35x is too hot to hold your fingers on, it's probably too fast @ that restriction, if you can hold your fingers there it won't burn out. That's the primitive method I've been using and mine are fine. Makes sense that your GPUs favor high flow, CPU blocks are designed to create their own turbulence via center injection and narrow lanes, GPUs are designed to have relatively low restriction and to run decent at low flow because of the fact most high end systems w/liquid cooling will have multiple blocks in either parallel or serial.
This is a good thing I did not think of at all smile.gif thank you, it was barely even warm to my fingers

Quote:
Originally Posted by Jakusonfire View Post

Do you mean that twin 480's aren't keeping your water delta under 10C cooling a single card? If so that is very strange. My card isn't a king but the power level isn't that different. My delta hovers around 10C when playing BF4. Thats a 240 + 360 with fans at 1300 RPM. At full system load its about 12.5C. I cant compare with similar fan speeds cause I have gone all low speed fans now.

How is your airflow? Sealing around the edges of rads and fans can make a significant difference.

I'm running everything as intake with top rad as an exhaust
( front 2 fans intake, bottom 16rad fans intake, top back fan intake )
Fans are snug on rad, I can barely feel any air escaping through them

Will that miniscule kink in loop amount to anywhere near a .1 GPM flow loss? it doesn't look too bad in the pictures but at a side angle you can tell the tubes getting a good squeeze

Am I honestly being paranoid or is this more of a normal? The cards and gpu both are running 1.3v+ it seems only when I stress the GPU and CPU to produce the heat is where the delta gets outrageous but when testing either just the CPU or GPU alone it will remain <10C

Would I be foolish in adding a single 140mm radiator on the back or even a 120mm/240mm slim on the front? Iirc the 2 480's should be able to dissipate all the heat produced but it is not working that way frown.gif
Even GPU only I can get the temperature of water to remain at 33C with room being 25C whether the rad fans are at 50% or 100%

As strange as it sounds, feels like when testing both gpu and cpu the rig puts out so much heat that it will raise room temperature by 5F+ and results in a continuous loop of warmer water, warmer air.


thank you both for trying to help me with this, I've actually held back on buying anything else until I can make sense of whether I am making a mistake or if this is all normal.
  
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post #9 of 12
Thread Starter 
Sorry for the question, but will that cpu kink restrict the flow by more than marginal amounts?

If I pinch the tubing it squeezes from wall to wall very easy...... frown.gif
  
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post #10 of 12
I wouldn't have thought so. I've had worse kinks in loops although I didn't have a flow meter at the time to measure it. If your temps are still OK I'd sort it out next time you dismantle the loop rather than do it now (but I bet it's annoying you).

Edit I'd be interested in the links to burnt out 35Xs.
Edited by Big Elf - 5/12/14 at 9:36am
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