Koolance 400A-S Threadripper Water Block V2 Review

Koolance finally has its redesigned version of the CPU-400A-S AMD Threadripper water block out for sale, and we have gotten it through our review testing. Koolance engineers have gone back and fully redesigned this block specifically for Threadripper and it shows both in terms of performance and design.

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Koolance 400A-S Threadripper Water Block V2 Breakdown

As usual we did an unboxing and teardown if you are more of a video fan. We show you exactly how everything comes apart and what all is inside.

Again, here are versions 1 and 2 side by side to show the differences. You will first notice that our flowplate orientation has changed by 90 degrees. This accomplishes one thing that is very important. Instead of our coolant flowing longitudinally down the length of the Threadripper dies, it now flows perpendicular to the long side of the die. This gives us the same flow rate as previous but now the coolant spends less time on top of the die allowing us to have more unloaded coolant on the die area at any given time.

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Using our super high tech visual aid, the black rectangles represent our active Threadripper dies; these are located in the same position on every Threadripper CPU. The new micro-fin footprint is more than sufficient when it comes to fully covering our dies end to end, which we did not have in the previous version.

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The micro-channels are excellently cut and free of any defects that we can see. The nickel plating is also expertly done, as it has been by Koolance for over a decade now.

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The coldplate on this block is so highly polished that it is actually hard to get the camera to focus on the surface of the block rather than the reflection. The plating is as close to perfect as you will find.

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The flow plate sits down in a cutout in the block so it is easy to place back in perfectly when you go to put the block back together. The nozzle also sets down into a cutout as well. However the nozzle can be put in "backwards." It is obvious how it is installed, but you need to pay a bit of attention here as the part is not keyed in order to just fit in one orientation.

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The nozzle does have an O-ring that fits down onto the micro-fins in order to force the full stream of coolant flow across those. The O-ring on the body of the block itself sits down into a channel that holds it securely in place when you go to reassemble the block.

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All of the pieces of the 400A-S fit together to lock all the pieces in place. Once all fitted together, you have six countersunk screws that tie it all in place. Those screws thread into the arms on the block, so you are at no point screwing into plastic.

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The coldplate is not as flat as we would like to see on a Threadripper block. On a diagonal plane, it is very "flat" all the way across. Lengthwise, it is very flat as well. Side to side however, we can see a bit of a curve in it. So overall we have a convex shape to the 400A-S albeit extremely slight. I am not sure if this is by design, or due to how the block is machined, but if I had to guess, I would suggest it is designed this way. We will see how this works out for mating to our CPU.

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