Reeven Okeanos RC-1402 Dual Tower CPU Cooler Review

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Recently we did a review on the HANS CPU cooler by Reeven which took a 4.5/5 stars and today we have yet another review samples from them. Today we are going to take a look at the Okeanos CPU cooler by Reeven which is a dual tower cooler and make use of 1x 120mm fan and 1x 140mm fan. Also Okeanos has a unique heat pipe design with both 6mm pipes and 8mm pipes being there. So how does the odd combination of 140mm and 120mm fans and unique design of Okeanos do in performance, let’s check out below.

Reeven’s take on the cooler:

“OKEANOS , the flagship of Reeven CPU cooler, represents extreme performance. This high-end model is designed with two fans and heatsink, 6 high-quality heat pipes and fine-polished copper base, OKEANOS is definitely the best choice for overclocking and gamers.”



Model Number RC-1402
Socket INTEL: LGA 1150 / 1151 / 1155 / 1156 / 1366 / 2011
AMD: AM2 / AM2+ / AM3 / AM3+ / FM1 / FM2 / FM2+
Overall Dimension (W)140 x (H)163 x (D)135mm
Fan Dimension 14cm: 140 x 140 x 25mm
12cm: 120 x 120 x 25mm
Heatpipe Ø6mmx4 + Ø8mmx2
Fan Speed 14cm: 300~1700(*300~1100)RPM
12cm: 300~1800(*300~1200)RPM
Air Flow 14cm: 16.3~92.4(*16.3~59.8)CFM
12cm: 16.6~92.5(*16.6~63.8)CFM
Static Pressure 14cm: 0.002~0.091(*0.002~0.034)inch H2O
12cm: 0.003~0.098(*0.003~0.042)inch H2O
Noise Level 14cm: 5.8~36.4(*5.8~21.3)dBA
12cm: 4.0~33.4(*4.0~23.6)dBA
Weight(with Fan) 1145g




Starting with the unboxing of the sample, we received the Okeanos CPU cooler in a cardboard box. The box seems to have a blue camouflage theme, not that you’ll be taking it to battlefield. On the front we have a picture of the CPU cooler with the company logo and their slogan mentioned on the top and some features listed at the bottom.



On the right side of the box, we once again have a picture of the cooler itself with some more graphical features listed at the bottom like dual radiator and dual fans.



Then at the back we have the specifications of Okeanos written in multiple languages.



And on the last side we have some precautions about the CPU cooler and two geometrical images of the cooler and the socket compatibility list of the cooler.



Top of the box, is also nothing out of ordinary and we have the cooler picture and model mentioned and the socket compatibility list again.



Once you open the box from the top, this is the scenario you’ll see. There are 2 boxes on each side with another one in the middle of both radiators.



Just like HANS, we have a container at the bottom that keeps the heatsink is place. Reeven has done a good job packaging once again.



So I pulled out the content as they were inside the box and this is how they  were placed inside the box.



Looks like a nice view right? Anyways, the boxes on the sides contain the fans and the box in the middle of radiator has all the good stuff. By good stuff I mean the mounting kit and manuals.


Closer Look:

Now let’s take a closer look at the heatsink design and the fan below.


So this is how the heatsink looks like. Not clear from this image because of the arrangement, there are a total of 6 heat pipes with 4x being 6mm and 2x being 8mm.



Just like HANS, we also have a locking mechanism present above the base of the CPU cooler, that’s where the mounting bar will go to fit the CPU cooler in position. More on that later.




At the bottom we can have a clearer picture of the how heat pipes are arranged on the CPU cooler. There 4x 6mm heat pipes present at the outer side while 2x 8mm heat pipes near the nickel baseplate.. Also on the base we have a safety sticker applied that should be peeled off before we apply the thermal compound and mount the cooler.



The top once again has the company’s name on both towers in alternate direction. Usually we see the edgy point of the heat pipes on top, but the heat pipes ends at the last fin on Okeanos.




Now let’s have a closer look at the cool wing 12 fan. The fan has a total of 11 fins and the 4x pin cable is braided and is long enough to reach far corners of ATX motherboards. Although we don’t see the washers on the corner of the fan body.




On the other hand, the Coldwing 14 fan has a total of 9 fins but the 4x pin cable is braided as well and long enough to reach far corners of ATX motherboards. No washers on corner once again.



So coming down to the box we got with the cooler, we have a plastic container with lots of stuff in it, while the cardboard box also had 6x fan clips and the instruction manual. Even though we get 2x fans with the Okeanos, it can house 1 more fan and that’s the reason we have 6x fan clips. We also get 2x fan speed adapter for both the fans to tone down their speed for lesser noise. 1 is for 120mm fan that brings it down to 1200RPM while other one is for 140mm which brings it down to 1100RPM.





Inside the plastic container, we have 3 more plastic container. One containing the backplate, other the screws and little wrench while the last one containing spacer, washers and thermal grease. Just like HANS, the bracket wasn’t treated with a plastic container.







And that’s how the HANS looks once the fan is mounted on the heatsink and on motherboard.



Now coming down to the hard working part of the review where we have to install the cooler, there are various steps you’ll need to go through for the installation. The process is similar to the installation of HANS as both the coolers use same mounting kits, but there’s a change in the process.



So before installing the CPU cooler, you’ll need to grab your cooler backplate, insert the 4x backplate bolts through it and insert the 4x silicon washers over the bolts.


When that’s done, you’ll need to place the backplate on the back of the motherboard and insert the bottom of bolts into the 4x holes near the CPU socket on the motherboard.



Then once the bolts are through the holes, flip the motherboard and insert the 4x spacers on the bolts.



Once that’s done, you’ll need to place the mounting bracket on top and place 4x nuts on the bolts and fasten them up. You can use the wrench that came with the cooler or you can use your own tools for this purpose. One important thing to mention is that you must place the bracket in such a way that one of the holes on bracket is facing the top and bottom sides of the motherboard.

Now you can install the CPU in the socket or if you feel it’ll be uncomfortable to install the CPU in the socket, then you can do this before installing the mounting bracket.

Note: There are 3x holes on each corner of the bracket, the bolts will only go through the one’s that is assigned for the preferred socket/motherboard. Mine is a LGA 1150 motherboard, so they went through the middle hole.



Next, you’ll need to apply the thermal grease that came with the cooler or you can go with your own brand. Now insert the mounting bar in place over the base of the heatsink carefully. Once that’s done, gently place the heatsink over the CPU, but don’t forget to peel of the sticker from bottom base before. Make sure that the hole on the mounting bar and mounting bracket are in line. Once in place, put the screws for mounting plate on the mounting bar and fasten them up all the way through the mounting plate. Finally plug one of the fan cable into the CPU fan port while other into the chassis fan port on motherboard and we’re all set. You can also use your adapters at this step. Ohh and the instruction manual sure does a better job at explaining the installation then I do.


RAM clearance:





When it comes to the gap between RAM slots and the cooler, there isn’t any. The fan on the front is directly above 2 and a half RAM slots which very much limits the option for RAMs. When it comes to low-profile RAMs like HyperX Savage, you won’t have any issue installing them even into the nearest slot to the cooler. I even managed to install Avexir Blitz which has a little bigger heat spreader than Savage. But as clearly visible from the above picture, when it comes to RAM with large heat spreaders, you’ll need to sacrifice 3x slots near the socket side leaving you only with 1x slots if you’ve got on fan on front.


Test Rig Specifications:

CPU Intel i5 4690K (3.9GHz-4.5GHz)
Motherboard Gigabyte GA Z97-HD3
CPU Cooler Reeven Okeanos
RAM Avexir Blitz 1.1 2400MHz
HDD Seagate Barracuda 1TB 7200RPM
SDD PNY Optima 120GB
PSU Chieftec Ntro 80+ Bronze 1200W
Case Open Air



Prime 95

MSI Afterburner


Acoustic Performance:

When it comes to the acoustic performance of the CPU cooler, Okeanos produce fairly noticeable amount of noise. In open air system, you can clearly hear the noise coming from Okeanos 2x fans in silent environment. And when you install another fan, the noise level increases even more. In open air setup, I could hear the sound coming from the cooler from even like 2-3 feets away from it. So if you work or have your PC in silent environment, you’ll clearly hear the humming sound of turbulence created by the fans. Once I tested the fans with both adoptors plugged in, the nouise level dropped drastically and made it alot quitter compared to when the fans were running at full speed. I couldn’t create a graph for this test yet as I can’t find a silent enough room or place where I can do the test with a dB meter. The most silent place I know shows ~30dB at minimum. I do plan on updating the review with graph as soon as I have a place for this test.


Thermal Performance:

Thermal performance is divided into tests. One where we tested the coolers on i5 4690K at 3.9GHz which is basically the turbo frequency of the i5 4690K and second where we tested the cooler on i5 4690K on 4.5GHz which uses rather high voltage. On both frequencies we tested the cooler when the system was at idle or at full load. Before noting down the temperatures, we left the system idle for 10 minutes so that the CPU cooler could reach its peak point of cooling and CPU on its peek point of producing heat. During the test, the ambient temperature was 28C.


3.9 Okeanos Delta

3.9 Okeanos

Compared to the other two coolers and HANS by Reeven, there isn’t much of a difference in the temperature when the system was idle, but it is indeed higher than HANs which uses the same Coldwing 12 fan used in Okeanos. But again, Okeanos is using 2x different size fan, this could be the reason for such behavior. Once we ran the Prime95 stress test, the temperature started rising and we came to a stable temperature point of 55C on Okeanos which is lower than HANS by 5C. Okeanos has done well keeping the temperature of CPU low but I was expecting better results as Okeanos is said to be the Flagship cooler of Reeven.


4.5 Okeanos Delta

4.5 Okeanos

When it comes to the 4.5ghz overclock, the Okeanos is sitting at 38C which is 2C lower than it’s little brother and on load, the temperature goes as high as 78C on average with 2x fans. When another 120mm fan was mounted, we had a drop of 1C on idle and 2C on load. So basically, we see that the Okeanos has beaten HANS by a difference of 7C with 2x fans and 9C with 3x fans.



Defiantly the Okeanos has the bulky look of a dual tower CPU cooler which actually looks good in a tower chassis for bragging rights. The two different size fans might take some time getting used to but it doesn’t really look that bad to begin with. And you can swap any of the fan with your own brand if you like.

When it comes to the acoustic performance of Okeanos, it’s not the silent type you’ll be looking for as it produce fairly noticeable amount of sound. But the good part is that Reeven does provide 1x speed adapter for both fans which drops down their speed resulting in lower noise level, but also in poorer thermal performance. In other words, if you want a silent fan with great overclocking performance, this might not be your choice.

When it comes to the thermal performance of the cooler, it’s clear that the Okeanos does good job keeping the CPU cool under low overclock and does a fair job when the OC is brought up a notch keeping the CPU at 78C. 78C (50C delta) of course is a high temperature but it gives you the idea that it can keep your CPU cool if you drop down the OC a notch, and if you’re looking for low temperature at 4.5GHz OC, you might just want to get yourself a custom loop water cooling system.  Also worth mentioning is that adding up another fan didn’t had much positive impact on the thermal performance, only decreasing 1-2C while increasing the noise level greatly compared to it.

Okeanos has an MSRP of $75 which considering that there are other dual tower coolers tagged at same price point puts it in competitive place. So if you’re looking for a quiet CPU cooler, I don’t think I would recommend you Okeanos, you might just want to save a few bucks and look for a AIO CPU cooler or other options but if you’re looking for performance that can keep your CPU cool under  high overclock (not extreme) with somewhat bearable noise then Okeanos proves itself to be a good option. I would like to rate Okeanos 4/5 stars.


Reeven provided us with the Okeanos CPU Cooler so we could do a showcase and share thoughts on the product. All opinions are 100% mine and mine alone.

We are influencers and brand affiliates.  This post contains affiliate links, most which go to Amazon and are Geo-Affiliate links to nearest Amazon store.