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What is the best order for the components and why?

post #1 of 21
Thread Starter 
I have noticed that many people have the components arranged cpu->res->pump->rad->cpu. This surprises me. In automotive systems that I am used to the pump is after the rad and the res: ->cpu->rad->res->pump->cpu. Also, when a restriction is added, it is on the outlet from the cpu (ok, engine), raising the pressure in the engine. However, here, when restriction are added to the D-tek Fuzion they appear to be added to the inlet, before the water enters the block. Is that correct? If so, why? If correct, that would seem to create backpressure at the pump with no advantage for the components.

Thanks,

David
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post #2 of 21
This is so the CPU gets the coolest water. The CPU puts out the most heat and then the pump, that is why they both come before the radiator. And the reservoir is to prime the pump (hence why it is before the pump) And there you have your loop

res > pump > rad > cpu > res
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post #3 of 21
dr4gon has you covered basically we don't want excess heat in our loop and there is an amount of heat the pump creates
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post #4 of 21
see this thread:

http://www.overclock.net/water-cooli...oop-order.html

Here's a different opinion. In a closed loop system, component order has little affect on performance. Place the cpu after the rad if you must (won't hurt), but the performance affect is negligible. Construct your loop to minimize the amount of tubing and restrictions (tight bends, etc). DO always place the res/T-line just ahead of and higher than the pump to help ensure you don't get a dry start which can ruin your pump.

OP, don't get Martin started by talking about pressure. I did, and here's what he did to me --->

The next time somone says more pressure cools better, tell them to run 20' of tubing up the wall to their ceiling in a T-line or reservoir feed tube. This will gain you pressure in the system in the form of static pressure created by the water column above....but it won't do a darn thing for performance. - Martin

Seriuosly, this is a relatively small closed loop system. Any component that comes "before" also comes "after." The order you listed is a loop that can be rotated left or right, so what comes before what?.
post #5 of 21
res-pump-rad-cpu any other blocks, you want the coolest water possible hitting the CPU first...Keep your tubing lengths as short as practical and don't use any more fittings then you need...
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post #6 of 21
Quote:
Originally Posted by TonyL222 View Post

OP, don't get Martin started by talking about pressure. I did, and here's what he did to me --->

The next time somone says more pressure cools better, tell them to run 20' of tubing up the wall to their ceiling in a T-line or reservoir feed tube. This will gain you pressure in the system in the form of static pressure created by the water column above....but it won't do a darn thing for performance. - Martin
What?

I didn't mean for it to come off that way if it did. Pressure and flow and all this hydraulics stuff is easily confused, they are all related in one way or another.

MeTony...

Sorry, I must have had another bad day at work or something. I'll go take it out on one of our pesky cats or something..
    
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post #7 of 21
Quote:
Originally Posted by Martinm210 View Post
What?

I didn't mean for it to come off that way if it did. ... I'll go take it out on one of our pesky cats or something..
Haha!! No worries Martin. I didn't take it in a a bad way at all. I thought the butt kick smiley was funny. Been looking for an opportunity to use it
post #8 of 21
Quote:
Originally Posted by TonyL222 View Post
Haha!! No worries Martin. I didn't take it in a a bad way at all. I thought the butt kick smiley was funny. Been looking for an opportunity to use it
Good!

Well I'm going to use it again. I have three cats I'd like to make use of this avatar on.

Zeus (Annoying little orange cat)Me

Ahh...

Tiger (The other irritating orange cat)Me

Ahhhhhh.....

Pearl (The pesky little white and black one)Me

All three of them for dragging all these dead mice and moles into my garageMe

Ahhhhhhhhhh......

I feel better now..
    
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post #9 of 21
Thread Starter 
I guess the difference from the automotive systems I am familiar with is temperature. Inslide the block, the water is only a fraction of an inch, often less than 7mm, from 2500°F, 1400C temps. Fluid temps are 75-95C. The pressure is necessary to insure it maintains contact and doesn't form pockets. Outlets are added where it might.

In these systems the the temps are a very hot summer day (<40°C), and the pressure isn't an issue, just overall flow. Adding the heat of the pump to the fluid increases the heat exchanger effectiveness by raising the temp difference.

So, block, res, pump, rad....got it!

Question: of a TEC or very hot CPU used (Kentfield over 200w for instance), does the CPU need its own loop? Wouldn't the water be rather hot before reaching the GPU, which generates quite a bit of heat itself?
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post #10 of 21
the water wont warm up more than 1C going trough a waterblock in your average quadcore WC loop. a TEC may add another 1C.
whats more important than that is your radiator. it should have enough surface area to dissipate the heat in the water to keep the temperature eqilibrium as close to ambient as possible.
the water heats up from passing trough the block for many times, not just 1 time, so the water that enters the CPU isnt significantly cooler than the water that goes to the GPU.
again, just make sure to get a big radiator.
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