The Koolance CPU-200G water block does restrict the flow. I needed a water block to get my computer running and it was the only one available without ordering. One good thing seems to be the gold plating of the copper core. I have had a problem with other metals (copper and aluminum), but not with the block. I just wish it came apart, it is sealed to the top. And running with an evaporative bong cooler, with a Rio 1700 pump rated at 642 gph the water temp is a few degress cooler than ambient air temps. I have even gotten the water 10 degrees below ambient on good days. And I have cold air from under the house coming in the side of the computer, exiting the rear and feeding the bong cooler. The top of the bong has an elbow that sits in a sunny window, just below is the showerhead with the cpu return line and a second line from the pump. I set a sponge on top of the shower head. The window warms the pipe that the sponge is sitting in. Since adding the elbow and the sponge it has kept the water cooler and evaporates more water. My reservoir is a plastic kitty litter container, holds about 5 gallons. The lid flips up, but the back of the lid stays on. So that is where the tubing connections go through. Works good, no more random reboots. I guess it all depends on the size of tubing you want and if it is important that you can take the block apart.
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