Excellent cooling performance for 70 euros? Reeven Okeanos

Parameters and details

Reeven seems like a smaller manufacturer, but it does not matter at all in the case of Okeanos. This cooler can definitely stand its ground. It could be used as a good example in many ways. There are some drawbacks for sure, but you get really decent cooling performance for the money.

Basic parameters

*These measures indicate distances between the cooler and RAM slots, or more precisely the nearest PCIe × 16 slot.
**The data reflect the situation on Mini-ITX boards which typically have 50 mm from the center of the socket to the first slot. With the ATX format, it can be up to 7 mm more and that means one extra slot and a wider compatibility than is mentioned in the table. We measured the height limit with fans that are aligned with the maximum specified coolers height.
***It is not a part of the accessories, you need to send a requested to the manufacturer
The assembly kit for AM4 is free, you only pay for the shipping.

Details

The design of the heatsink looks really fine, and the manufacturer made several good decisions. Dual tower is ground zero for every air cooler with big ambitions. However, Reeven has some nice features that distinguish it from others. First of all, it has a narrower profile (135 mm), which makes Okeanos one of the narrowest dual tower CPU coolers. What is interesting is that the gap between the towers provides a lot of space (6.5 mm) for more comfortable mounting of a fan.

Remarkable is the configuration of heatpipes. There are two 8 mm thick pipes above the center of the IHS, where the heat exchange is most intense. The remaining four pipes are 6 mm thick, which is basically a standard. Interesting are also routes of these pipes across and through the radiator, they look like triangles. The thinner pipes are adjusted to the direction of the airflow behind each other and closer to the sides. The thicker pipes are oriented more towards the center of the heatsink. All this makes it easier to use the whole area effectively, and Okeanos heatsink should be excellent in its weight category (782 g).

   

However, the fans are average, or perhaps below average. They have cheap bearings which produce rustling and that does not fit into quiet configurations very much. The second major problem is related to the fact that each fan has its own different size (120 + 140 mm). There is nothing wrong with two fans with different measures, but the inconsistency in their flow definitely is an issue. Even without an anemometer, it is obvious that the front fan has a higher flow rate than the middle one. The increase in the flow rate is not consistent even according to the same voltage, which can be seen in the chart. The noise level at 1100 – 1200 rpm (measured with the front fan, rear is 10 – 20 % slower) rises a bit and then remains linear. And the question is not whether the inconsistency of the airflow has negative effect on the cooling performance, but rather how significant this negative effect is.

And then there is another curiosity around the fans. Compared to Noctua NF-A15, their consumption is at least twice as big with similar flow rate. While NF-A15 has only 1.4 watts at 12V, Reeven Cold Wings consume 3 W with similar airflow, and 9 W with maximum airflow. The start-up voltage is also quite big – 7.6 V.

   


The configuration of a smaller and a bigger fan is not very common these days (usually it’s 140 mm + 140 mm), but we think it’s a shame. Loss of efficiency per unit of noise is nothing terrible with 120-mm fans, but a smaller frame extends compatibility with RAM – 3cm (90% of modules are higher) and 5 cm (90% of modules are smaller) is quite a difference.

   

Compatibility with the PCIe slot is also very good, despite the symmetrical design. Also, there is no collision on the boards with the first GPU slot near the socket. Complicated dismantling is, of course, a different story. But that should be resolved by manufacturers of boards.

We appreciate the possibility to install the cooler in two ways on AMD sockets. Thanks to a handy frame, the fans can be directed to both the rear and the upper outtake. And although this may seem like a matter of course, it is quite rare in fact. Most coolers cannot be installed in two positions on AMD AM3/4.


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