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Fitting size

G

German Muscle

Supreme [H]ardness
Joined
Aug 2, 2005
Messages
7,247
Im looking into water cooling. I know there are 3 different sizes for fittings. 1/4, 3/8, and 1/2. Are there any pros and cons to those? for example pressure differences and flow restrictions?

Any help appreciated.
 
1/4" tubing is obsolete. 3/8 vs 1/2" ID perform identically. I'd recommend 3/8" because it can be bent tightly more easily.
 
Depends completely on the blocks being used and pump and radiators being used. High flow vs. High pressure and the proper balance is key. The size of the fittings must match the other components.
 
nobody_here said:
Depends completely on the blocks being used and pump and radiators being used. High flow vs. High pressure and the proper balance is key. The size of the fittings must match the other components.
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EK Supreme HF CPU waterblock, dual EK GPU Waterblocks, EK Coolstream 360 Rad, EK Multioption 250 Adv res, and a Swiftech MCP655-B pump.
 
maximum pc measured as much as 8*c max load difference between 3/8 and 1/2 tubing in their latest article on custom water cooling. they also used koolance qdc fittings in that loop. i generally use 1/2id fittings and tygon tubing with full case builds and only resort to 3/8 for small form factor or htpc builds. i also liberally use vl3n qdcs.
 
Ill have to check it out. Im planning to use mostly Bitspower fittings. I was also thinking about using 1/2 inch fittings and 3/8 tubing. But i want to know the differences other than the size obviously before I get anything.
 
i use bitspower fittings for everything i don't require a qdc for. i don't think the bitspower qdc are of the non spill variety. that's why i use the koolance vl3n qdcs.
 
rennyf77 said:
maximum pc measured as much as 8*c max load difference between 3/8 and 1/2 tubing in their latest article on custom water cooling. they also used koolance qdc fittings in that loop. i generally use 1/2id fittings and tygon tubing with full case builds and only resort to 3/8 for small form factor or htpc builds. i also liberally use vl3n qdcs.
Click to expand...


Interesting i just read it myself.
3/8-inch-diameter tubes spiked our temperatures on 100 percent CPU use to an average of 81 C and a maximum of 83.5 C. The same cooling setup using 1/2-inch tubing hit an average of 73 C with a maximum of 75.25 C. The more fluid you can move over your heat exchanger, the cooler the average temperature that fluid will be—that’s why 1/2-inch tubing win
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Source: http://www.maximumpc.com/article/ho..._techniques_detailed_and_constructed?page=0,2


Based on the testing ive seen the difference is almost minimal with a 1 degree variance at best. Source: http://www.xtremesystems.org/forums/showthread.php?t=147767

The systems are completely different. in that Xtreme test it was a DDC2, while MPC was using a stock MCP650, a pump known for high LPM but not so much headpressure.

Results22A13.png


That graph above was done by doctor martin on a 3x120x25mm rad with medium speed fans on various blocks on an OCed 920. As you can see above 2gpm youre looking at a temp INCREASE almost.
 
rennyf77 said:
i use bitspower fittings for everything i don't require a qdc for. i don't think the bitspower qdc are of the non spill variety. that's why i use the koolance vl3n qdcs.
Click to expand...

QDC meaning Quick dis connect? Im planning on using Barb style fittings for a cleaner look.
 
yes, when i type qdc i mean quick disconnect. for a clean look i go with compression fittings. i generally hate the sight of barbs with zip ties, but every builder has his or her own aesthetic philosophy.
 
you'll never be able to convince a customer that no clamps are safe, but if you're building for yourself, why not?
 
gorgeous. i'd buy it. someone who doesn't know anything about computer hardware let alone liquid cooling....
 
doesn't mean some rich boy wouldn't want one if he saw something like it. you'd just have to convince pops.
 
rennyf77 said:
doesn't mean some rich boy wouldn't want one if he saw something like it. you'd just have to convince pops.
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I still wouldn't sell them a non self contained system as they dont have the know how to maintain it.

After studying the chart above im thinking of switching to the Apogee XT. Also anyone have anymore insight on the 3/8 or 1/2 thing?
 
rennyf77 said:
maximum pc measured as much as 8*c max load difference between 3/8 and 1/2 tubing in their latest article on custom water cooling. they also used koolance qdc fittings in that loop. i generally use 1/2id fittings and tygon tubing with full case builds and only resort to 3/8 for small form factor or htpc builds. i also liberally use vl3n qdcs.
Click to expand...

That maximum pc article was retarded and the writer was flamed to death in the comments and various forums.
 
AdvanSuper said:
That maximum pc article was retarded and the writer was flamed to death in the comments and various forums.
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interesting. i was pretty surprised by the difference in load temps myself, but couldn't think of any recent evaluation that refutes the author's findings other than the 2007 post from extreme forum.
 
rennyf77 said:
what does that have to do with anything? like people who buy ferraris know how to maintain them.
Click to expand...

Cars are expected to have maintenance like computers. People tend to not maintain them until something is not working. In the case of the computer and watercooling setup getting to that point means alot of money and enough money spent to buy another computer or worse. I dont really care what you would or wouldnt do. I myself wont sell people stuff that will just mess up and make me look bad. Anyone wanting a setup like that should know how to build a computer. Otherwise its not for them. This is for me not for someone else.

Now back on topic.
 
rennyf77 said:
interesting. i was pretty surprised by the difference in load temps myself, but couldn't think of any recent evaluation that refutes the author's findings other than the 2007 post from extreme forum.
Click to expand...

That's because science hasn't changed since 2007. :p
 
Cruiza said:
That's because science hasn't changed since 2007. :p
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the xspc x20 cpu block was a great performer when it was released. it was replaced by the delta 3 that worked better still. now the delta 3 is considered vastly inferior to its replacement the rasa. the maximum pc article used the latest koolance cpu block, which i bet is superior the the one it replaced. maybe its time to re-examine the matter of tubing size. as to german, sometimes you don't get to decide whether or not you want to build it because your boss tells you to do it, and that's why compression fitting removes any question about whether or not the tubing might slip off.
 
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