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Different questions, my first water cooling operation. - Page 2

post #11 of 18
Thread Starter 
Quote:
Originally Posted by defiler2k View Post

My only complaint about XSPC is their lack of support but that's a whole different story, their products are very elegant.
Okey. Good to know.
Quote:
Originally Posted by defiler2k View Post

The other thing I have heard is that if you have too large of a loop it takes longer for the fluid to circulate and it wont cool as efficiently as possible.

Hmm. That is very interesting information. My loop will be quite large since the case is enormous, but it'll have at least 3x480 rads tho. I hope that'll be plenty even tho the loop will be long.

I'll most likely pick a medium tube res. I dont see any point in having a large res if there is no difference in performance.
post #12 of 18
Quote:
Originally Posted by Mephobia View Post

Another question Im curious about when we're talking about res. Is there any performance differences in having a larger res vs a smaller res.

There will be a small performance boost with the larger reservoir because a greater volume of coolant gives the entire system more heat capacitance. The effect would be that your equilibrium point (stabilized coolant temp with everything running) will be a little lower--meaning that your rads won't have to work as hard to dissipate that heat, meaning you can run your fans at lower speed.

Although, three 480's for only three chips already gives you a lot more heat dissipation than "normal", so your equilibrium point will already be low and your fans shouldn't need to run very fast to begin with. thumb.gif
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Blinky
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post #13 of 18
Thread Starter 
Alright, Cheers threephi!
post #14 of 18
Quote:
Originally Posted by defiler2k View Post

The other thing I have heard is that if you have too large of a loop it takes longer for the fluid to circulate and it wont cool as efficiently as possible. I personally scaled back to a smaller res from a Z250 because I noticed coolant was getting stagnant on the top of the res. When I pulled it a part you could see the line where the coolant was not circulating as much compared to the rest of the res and that was with 2 D5's.

It sounds like you might have had an issue in your particular setup that caused some areas to be stagnant, but that's completely unrelated to the total water volume.

It really doesn't matter how long it takes one particular molecule of H2O to complete a lap through the entire loop since its job is to absorb heat at the moment it is in a block, then dissipate it before it comes back around again. Efficiency comes from having good components in the heat transfer path (chip > TIM > block > water > radiator) and proper flow rate. Assuming things are flowing properly, I can't think of any scenario where a greater volume of coolant is less efficient.
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post #15 of 18
Quote:
Originally Posted by threephi View Post

It sounds like you might have had an issue in your particular setup that caused some areas to be stagnant, but that's completely unrelated to the total water volume.

It really doesn't matter how long it takes one particular molecule of H2O to complete a lap through the entire loop since its job is to absorb heat at the moment it is in a block, then dissipate it before it comes back around again. Efficiency comes from having good components in the heat transfer path (chip > TIM > block > water > radiator) and proper flow rate. Assuming things are flowing properly, I can't think of any scenario where a greater volume of coolant is less efficient.

The purpose of the reservoir is not to dissipate heat, its to feed the pump and ensure it does not run dry, while the coolant in the reservoir does dissipate heat slightly its not as efficient as when the fluid is going through the radiators that's why you don't see major differences in setups with a big res versus setups with a smaller reservoir.

In my case I had an issue with Mayhem coolant which was yielding higher temps and for some reason the "nano particles" were falling out of the fluid and gunking everything which in turn caused a separation in the reservoir.
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post #16 of 18
Quote:
Originally Posted by Mephobia View Post

Okey. Good to know.

Yup the only way I got a response from them was going on their FB page and commenting on one of their posts. That always gets a reaction from them. Otherwise their support on the site takes forever and a day!
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post #17 of 18
Thread Starter 
ah, haha. Yea, I've experienced that as well with other companies unrelated to computers that if you contact them on their facebook page they're quick on their feets.
post #18 of 18
Quote:
Originally Posted by defiler2k View Post

The purpose of the reservoir is not to dissipate heat, its to feed the pump and ensure it does not run dry, while the coolant in the reservoir does dissipate heat slightly its not as efficient as when the fluid is going through the radiators that's why you don't see major differences in setups with a big res versus setups with a smaller reservoir.

Agreed. Passive heat loss is nowhere near what you get from a radiator. But my original point was actually about heat capacitance, which is a different thing. It's the reason water is the best coolant (combined with how cheap and plentiful it is)--it absorbs and holds heat incredibly well, which is exactly the quality you want to remove heat from one place (CPU, GPU, etc) and dump it in another (rads). And from basic physics, given the same heat inputs and outputs, a larger volume of coolant will have a lower temperature.

I left out mentioning passive heat dissipation for simplicity's sake, but indeed, all else being equal, a larger volume of coolant in a larger reservoir will dissipate more heat than a smaller volume in a smaller res, meaning once again, the larger volume gives better performance. If you take that to the extreme, with a large enough res (think dozens of gallons if not hundreds tongue.gif), passive dissipation would do all the work and you wouldn't need even need a radiator.

Admittedly, both of these effects are small considering the two reservoirs Mephobia is choosing between, but it's there.
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