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Originally Posted by Althornin
less flow is...less flow. Pressure DROP (referred to as "head") is related to flow...but you seem to be mixed up.
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Less flow is lower pressure drop, as it is less restricting.
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Originally Posted by Althornin
Your water temps will rise less than a degree after passing through your CPU waterblock. Seeing as a millileter of water takes a calorie to raise one degree C, and assuming 2 lpm of flow, you can deal with 140 watts of heat before you raise a single degree per pass. Order in the loop is insignificant, really.
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How do you get that idea? :shrug:
This is depending on a lot of things, design of the block, water velocity, number of watts produced by the CPU, temperature of the CPU and water etc.
With your theory, you state it as a fact that all heat produced by the CPU is transferred into the water. And you are right.
Only problem is that you’re CPU will be about 50 degrees.... depending on the waterblock design. With a 20-25 degrees in temperature
difference between the water and the CPU block, a 2lpm flow will absorb the calories, and your temperature won't go higher, if your water temp does not rise.
With a good design waterblock and system, the temperature difference between the CPU and the water can be as close as 5 degrees or less. (Full load)
All new blocks (RBX, Whitewater, Cascade) are designed to work with turbulence, as this dissipates the heat the best. For turbulence to work, you need pressure (=head). Water will go in the least restricted way. If you split before the CPU, the water "won't" go via your CPU block.
As there is only little water passing your CPU block, your temps will rise. Just kink your 1/2 tube, and you will get about a 2lpm flow. Put some load on your CPU, and see what happens!
(this is how you will get a 5 to 10 degrees higher temp)
If you are right, a L20 (600l) should perform the same as an L30(1200l), with only a 0.5 degree of temperature change.
Just to keep things in the right perspective:
A really good designed watercooling system will keep your CPU temps about 5 to 20 degrees lower.
Compared to stock Intel CPU coolers, even a bad designed water cooling system will work better.
Ask yourself how far are you willing to go to get those few degrees out of your CPU core temp.
For the Hard disk statement, it's hard to find that one back.... :shrug:
I saw it some time ago on a hard drive vendor page, MTBF times compared to operating temperature. A hard drive running at 80 degrees had half the mtbf as the one running at 40 degrees.