Raijintek Ereboss CPU Cooler Review
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Raijintek Ereboss CPU Cooler Review

October 10th, 2013 James Leave a comment Go to comments



Today I will be taking a look at the second cooler that we have seen from new manufacturer Raijintek. The Raijintek Ereboss is a large Air CPU Cooler with a single 140mm fan with a maximum rotational speed of 1650 RPM, an additional 140mm fan can also be fitted if desired. The fan boasts a maximum CFM of 66.65 and a noise level of 28dBA. The Ereboss sits at the top of the Raijintek range with the Themis in the middle and the Aidos being their budget option.

  • The Raijintek Ereboss supports the following Intel Sockets: All Socket LGA 775/1150/1155/1156/1366/2011 CPU (Core™ i3 / i5 / i7 CPU)
  • The Raijintek Ereboss supports the following AMD Sockets: All FM2+/FM2/FM1/AM3+/AM3/AM2+/AM2 CPU

    Raijintek Ereboss - box front Raijintek Ereboss - box back


    The Raijintek Ereboss came well packaged in a red and white box, with a picture of the cooler and fan assembly on the front. The back of the box has three images highlighting various features of this Air CPU Cooler.


    Raijintek Ereboss - box left side Raijintek Ereboss - box right side


    The left side of the box lists the main specifications of the Ereboss, see Specifications/Features below for more detail. The right side of the box features another image of the Ereboss and highlights the Nickel Copper base, the six 6mm heat pipes, the ultra large dissipating area of the fins and the super slim 14013 fan among other things…


    Raijintek Ereboss - with instructions and accesries


    Within the box other than the 808 gram Cooler we find the 140mm (1100-1650 RPM) PWM fan, a bag of mounting hardware and an instruction guide.

    At the time of writing the Raijintek Ereboss retails for approximately £32.



    courtesy of Raijintek

    Product Name EREBOSS
    Product Number 0P105250
    Dimension [WxDxH] 140×110.5×160 mm
    Weight 808 g [Heat Sink Only]
    Thermal Resistance 0.11 °C/W
    Heat Sink
    Base Material Nickel Copper Base
    Fin Material Aluminum Alloy; Solder-less fins assembly
    SPEC Φ6mm
    Q’ty 6 pcs
    Dimension [WxHxD] 140x150x13 mm
    Voltage Rating 12V
    Starting Voltage 7 V
    Speed 650~1400RPM [PWM controlled]
    Bearing Type Sleeve Bearing
    Air Flow 44.43~56.55 CFM
    Air Pressure 0.76~1.24 mmH2O
    Life Expectance 40,000 hrs
    Noise Level 28 dBA [Max.]
    Connector 4 pin with PWM
    Intel® All Socket LGA 775/1150/1155/1156/1366/2011 CPU
    (Core™ i3 / i5 / i7 CPU)
    AMD® All FM2+/FM2/FM1/AM3+/AM3/AM2+/AM2 CPU

    * Additional details available here


    First Impressions


    Raijintek Ereboss - with fan Raijintek Ereboss - base plate


    First impressions are; damn, now that’s a big one! There’s no doubting that the Raijintek Ereboss looks like it’s got all the cooling potential one could want, the size alone means that this CPU Cooler looks quite imposing. Although due to the size installation worries do come to mind, but we will have to see. It’s a good looking cooler, just as the Raijintek Themis was before it.


    Raijintek Ereboss - accesories bag Raijintek Ereboss -  intel accesories


    For our Socket 1155 install we need a fair amount of mounting hardware, but the instructions are relatively clear and the image above right shows all of the components needed.


    Raijintek Ereboss -  fan


    The 140mm PWM fan is of special interest as the fan is actually a low profile fan at only 13mm, a second (not supplied) can also be fitted if desired. The fan has a maximum rotational speed of 1650 RPM providing a 66.65 CFM at 28dBA. The fan attaches to the heat-sink by way of 4 rubber pins, I really like these as not only do they help keep vibration/noise to a minimum, but also are they’re very easy to fit.


    Raijintek Ereboss - heatsink attatched


    Overall I’m impressed with the Raijintek Ereboss, the cooler looks good and seems well made too, my only concerns are its size and how effective that low profile fan is going to be. So let’s install the thing and see, shall we…


    Hardware Installation


    All of our CPU Cooler testing is carried out in our Intel Test Rig. Installation of the Raijintek CPU Cooler was relatively simple and our installation process is outlined below.

    • Step One

    The first task was to attach the back-plate that’s secured to the motherboard via the four screws and plastic nuts provided. Note that the plastic nuts are fitted with the closed side (the other side has a larger hole in it) of the nut facing up (see image below left). Once the CPU backplate has been secured in position the support brackets can the be attached…


    Raijintek Ereboss - backplate Raijintek Ereboss - stand-off's


    • Step Two

    The two support brackets (marked Intel) are simply attached via an additional four metal nuts, these brackets sit either side of the CPU, with the final crossbar fitting between the two sides. It’s important to keep these two support brackets aligned and straight, best to check the crossbar positioning before final assembly. 😉


    Raijintek Ereboss - side-rails


    • Step Three

    The CPU Cooler (minus fan) can then be attached to the CPU after of course you have removed the protective film from the base of the cooler and added some thermal paste (we use Arctic Silver 5). It’s best to also position the Crossbar into the centre of the cooler before you place the cooler into the case, the screws can now be fitted and tightened, using an alternate approach (i.e. a few turns on one side then a few turns on the other). DO NOT tighten down one side before the other as this will result in poor cooling as the Cooler is likely to be leaning to one side and thus not in full contact with the CPU.

    Access to one of the screws (the one nearest the MB backplate) is via a hole in the top of the cooler, unfortunately due to the height of the Ereboss a regular length screwdriver isn’t long enough. In addition to this you’ll need to somehow keep the screw at the end of the driver as you lower it into place. I ended up with an extra long electricians screwdriver with a bit of Blu-Tack to hold the screw in position, not ideal but it worked… 😉

    Finally the 140mm fan was fitted with the anti-vibration rubber clips provided. These are particularly good as not only do they cut down on vibration/noise but also are extremely easy to fit.


    Raijintek Ereboss - installed 1 Raijintek Ereboss - installed 2


    Testing Methodology/Setup


    The Raijintek Ereboss was tested on our Intel Test Rig, using Arctic Silver 5 thermal paste.


  • Intel Test Rig Setup

  • Case Cooler Master HAF XB Power Supply Corsair AX760i
    Motherboard ASROCK Fatal1ty Z77 Professional CPU Intel Core i7-3770K (Ivy Bridge)
    CPU Cooler Raijintek Ereboss RAM Kingston HyperX Beast 8GB 2400MHz
    Graphics Card EVGA GEFORCE GTX 780 SC SSD Kingston SSDNow 200 V+ 60GB


    The CPU was put under stress by running Prime95 for 15 minutes. The cooling performance of the Raijintek Ereboss was monitored by taking readings at both the start and end of each run with a 15 minute cool-down period allowed between each run. A close eye was also kept on the ambient temperature, with the maximum being recorded for each run, this allows us to calculate the Delta temperature (Core – Ambient = Delta). Each run was performed with the 3770K CPU set at 4.3GHz with the Cooler Fan at maximum (1650 rpm).

    A variety of utilities were used to monitor the CPU cooler during testing including:

  • CPUZ
  • CoreTemp
  • Speed Fan

    Hardware Performance


    • Raijintek Ereboss (fan at full speed (1650rpm)) Cooling Results (@ 4.3GHz / 1.130 volts)

    * HAF XB test case all fans at low = 30 dBA
    * HAF XB test case all fans at high = 42 dBA
    * All testing carried out with all fans at full speed

    Cooling Results with Raijintek Ereboss x2 fans
    Cooling Results with Raijintek Ereboss x1 fan
    CPU Cooler Type Ambient Temp Max Core Temp Delta Temp Noise Level
    Thermalright Silver Arrow SB-E Extreme Air 25.00 71.00 46.00 53 dBA
    Thermalright Silver Arrow SB-E SE Air 25.00 72.00 47.00 34 dBA
    Cooler Master Seidon 240M Water 22.00 73.00 51.00 52 dBA
    Raijintek Ereboss (fans x2) Air 22.50 79.00 56.50 40 dBA
    Raijintek Ereboss Air 22.50 80.00 57.50 37 dBA
    Raijintek Themis Air 24.50 85.00 60.50 41 dBA
    Raijintek Aidos Air 25.00 89.00 64.00 37 dBA


    From a cooling point the Raijintek Ereboss cools relatively well, meaning that I can keep our toasty Ivy Bridge CPU at or below 80 degrees Celsius. But given its size I was certainly expecting a little more, adding a second fan also didn’t seem to help matters much cooling the CPU by only an additional 1 degree! Its saving grace is that it’s still good value for money and it’s quiet.


    Final Thoughts


    The Raijintek Ereboss CPU Cooler is a difficult cooler to sum up, as although it’s well made and looks good, its size suggests that it’s going to perform far better than it does! Fitting an additional fan (not supplied) also didn’t improve performance much, reducing the delta temperature by only 1 degree!

    As one would have hoped it does out perform its cheaper sibling the Themis by around 3 degrees, it’s also a fair bit quieter (- 4dBA) than the Themis too. But when you factor in the price the picture changes significantly, as at around £32 at the time of review the Ereboss certainly offers plenty of cooler for your money.

    Its physical size is really the only issue here as not only are you likely to crave (possibly expect!) better cooling, but you may well run into installation issues too due to the sheer size of the heat-sink.

    Overall another good CPU Cooler form Raijintek, just remember that the cooling performance you get is based more on the price you paid than its physical size…



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    Raijintek EreBoss High Performance CPU Cooler
      Design/Quality pcGameware awards the Raijintek Ereboss a Bronze

    Many thanks to Overclockers UK for providing this sample for review


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