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Pump / flow speed

post #1 of 34
Thread Starter 
Hey guys just got my water cooling today, got it from zerohour. question that i have is this, faster flow or slower flow is better? i have an dd5 adjustable speed pump.
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post #2 of 34
Quote:
Originally Posted by shortfuse
Hey guys just got my water cooling today, got it from zerohour. question that i have is this, faster flow or slower flow is better? i have an dd5 adjustable speed pump.
You want to keep it on the max speed. The higher flow is better because it allows for more coolant to flow over the waterblock. If you coolant sits over the waterblock to long, it heats up, making the cooling less effective.
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post #3 of 34
Thread Starter 
But dont u want ur coolant/liquid to stay a lil bit longer so the rad has time to cool down the liquid/coolant.
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post #4 of 34
The four or five reviews I've seen that compared temps with flow rates all showed significant improvement in cooling as the flow increased to about 1 gal/min, and slight increases above that.

Based on that, it looks like the only downside to faster flow is more noise and greater chance of leaks. So if the noise doesn't bother you, I'd say max it out.

You can also use CPU monitoring SW (probably included with your PC, or available here maybe), and see for yourself.

PS Props--the DD5 has a reputation as a fine pump, and relatively quiet for it's performance.
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post #5 of 34
Do some testing and tell us what you get.
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post #6 of 34
Thread Starter 
I wont be able to do any test with cpu, im not done with my custom built reservoir and radiator housing.

So far the testing i have done is this hooked up the pump to cpu block to reservoir, after 2 hours of that the cpu block became hot so im assuming the pump builds up heat. now im testing pump to rad to cpu block to reservoir with max flow so far so good no leak no nothing.

Yo fstfrddy i have a question for u, can u use a drill press to act as a mill machine?
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post #7 of 34
Yo fstfrddy i have a question for u, can u use a drill press to act as a mill machine?[/QUOTE]

Yes you can, it is a little rough but I do it.
And yes the pump will add heat to the system.
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post #8 of 34
Faster is generally going to be better. I'm pretty sure there's a point where it's posible to run into a case of "the law of diminishing marginal returns" but I doubt it'll affect you or any other real-world WC loop.

Assuming it doesn't get noisy I'd turn it up all the way.
    
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post #9 of 34
On my MCP655 (same exact thing as D5) the manual says keep it on the speed setting of 5 (the highest) for the longest life of the pump. I can't even hear my pump, so its on 5.
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post #10 of 34
Quote:
Originally Posted by shortfuse
But dont u want ur coolant/liquid to stay a lil bit longer so the rad has time to cool down the liquid/coolant.

Yes, that is a valid observation as a basic operation of liquid cooling. However, at the tempetures computers generate, it is unlikly you will obtain a flow rate high enough to cause a large drop from going to fast.

Also, would likely only be a concern when using a small radiator. Using a larger radiator would minimalize any drops from shortage of time in the rad dispersing the heat it picked up in the CPU/GBU block. For instance, a system with a 80mm rad would be suffer more from a faster flow rate than a system with a dual 120mm radiator even at the same high speed.
Basically, you increase the size of your radiator, and you increase the amount of time the fluid is inside dispersing the heat....
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