All three coolers look very similar, because they all use similar design. Nexus FLC-3000 model stands out the most that is why we are going to start with it.
Design and Functionality
The cooler is built on four copper heatpipes each 6 mm in diameter that are soldered to the copper base. There is an additional aluminum heatsink right above the base. The heatpipes hold an array of aluminum plates topped with a 92 mm fan. Below is the schematic of Nexus FLC-3000 cooler:
The cooler measures 128 x 105 x 119 mm and weighs 450 g. The peculiarity of FLC-3000 is that its heatsink is at a 30° angle to the base:
This way it is fairly hard to determine the type of this cooler: tower or top. This is what makes FLC-3000 similar to the Katana coolers from the Japanese Scythe Company, which heatsinks are also positioned at an angle to ensure better cooling of the heatsinks over the voltage regulator components on the board.
Overall, Nexus FLC-3000 heatsink array consists of 52 aluminum plates of three types, each being 0.40-0.45 mm thick. They are spaced out at 2 mm from one another. The array has a cup-shape, so the fan appears sitting inside the heatsink:
The heatpipes are positioned almost linearly inside the heatsink. The distance between all of them is the same:
Note that all heatpipes pass very close to the top edge of the heatsink plates that is why we are in fact concerned about proper cooling of the third largest part of the heatsink array.
There are special grooves curt out in the cooler base for the heatpipes, which increases the contact surface between the heatpipes and the base and improved heat transfer:
The heatpipes are soldered to the base. The thinnest part of the copper base plate below the heatpipes is 2 mm. we didn’t notice any traces of thermal interface of any kind between the heatpipes and a small aluminum heatsink installed right above them.
The finish quality of the base surface is totally ideal:
Unfortunately, we can’t say the same about its evenness:
Even with a naked eye you can see a deepening, although it was ideally even over the entire contact surface with an LGA775 processor, as you can see from the thermal compound imprints below:
However, with an LGA1366 (or Socket AM2) processor, which features larger hear-spreader, the cooler was simply hanging on the sides of the CPU heat-spreader and there was no contact of any kind at all. At this point I can point out that we discovered this frustrating defect on all three Nexus coolers that we received for review. The cooler base plate measures 43x47 mm.
As I have already mentioned, Nexus FLC-3000 is equipped with a frameless 92 mm fan, which measures 84 mm in diameter. Seven semi-transparent fan blades have very aggressive curve and wider outer side:
The rotation speed of this fan originally made by Everflow (T128025DM AF model) is controlled using pulse-width modulation (PWM) method in the interval from 900 to 2500 RPM (±10%). The claimed level of noise is 15-24 dBA. There is no mention of the airflow and static pressure. The fan uses a slide bearing and can consume up to 1.7 W of power under peak load.
We don’t know how long the bearing is supposed to last, as the MTBF is not specified. The fan comes with a 300 mm cable.