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Alphacool has been a major player in the PC DIY water cooling market for years now, and yet there has been something missing from their catalog for a while now- a fully operational CPU cooler out of the box. Sure, you could argue that the Cooler Master Eisberg and the Fractal Kelvin series of all-in-one (AIO) CPU coolers were basically Alphacool made, but they never carried the brand name till Alphacool sold the Eisberg themselves but was not very well received due to customers not understanding that the included pump would be prone to reliability issues if voltage controlled. Alphacool seemed to be content selling pre-assembled kits and expected customers to be more hands on, until now anyway. With Swiftech and EK having shown that AIOs made of similar quality, or even identical in some cases, parts as those they sold separately for DIY cooling could work and had a market, enter then the Alphacool Eisbaer (Polar Bear, when translated to English). This is very much the successor to the Eisberg, but where it had complaints about a loud noise and never really made any breakthrough in the market Alphacool has much higher hopes for the Eisbaer. Thanks to Eddy from Aquatuning for providing an early test sample for this review.

So early, in fact, there the product was under NDA till June 27, 2016. But thanks to specifications provided separately, as well as what is on the product box, we do have something to go on:

Available models in the Alphacool Eisbaer series

  • 120mm XT45 Eisbear
  • 240mm ST30 Eisbaer
  • 280mm ST30 Eisbaer
  • 360mm ST30 Eisbaer
  • Eisbaer Solo (only Pump+AGB without tubes, radiator and liquid)

Fan- Alphacool Eiswind

  • Bearing: Sleeve Bearing
  • Voltage: 12 V
  • Connector: 4-Pin PWM
  • Operating speed: 550 -1700 RPM (+/-10%)
  • Air flow: 63,85 CFM (108 m³/h)
  • Air pressure: 1,66 mm H2O
  • Noise from 1 m: 29 dB(A) 
  • PWM 20% ~ 550 RPM, PWM 50% ~ 700 RPM, PWM 70% ~ 1150 RPM, PWM 100% ~ 1700 RPM


  • Based on DC-LT Ultra low noise Ceramic – 12 VDC
  • Rated speed: 2600 RPM
  • Operating voltage: 7- 13.5 VDC
  • Power input: 4 W
  • Max. flow in Eisbaer: 70 L/h
  • Max. Discharge head: 0.85 m

CPU Socket Compatibility

  • Intel Socket LGA 2011/2011-3/775/1366/1156/1155/1150/1151 (LGA 2011/2011-3 narrow ILM mounting kit sold separately)
  • AMD Socket AM2/AM2+/AM3/AM3+/FM1/FM2/FM2+/G34/C32/604/771

The Eisbaer Solo aside, we see there are 4 AIO models in this series with radiators, and included fans, being the primary difference between them. I received the Eisbaer 240, and I suspect it will be the most popular model of the lot. In many way, though, these quite different than the earlier Eisberg coolers in that the pump is different, and based on a new “ultra low noise” DC-LT pump, and the fans are completely new as well. Speaking on which, I like that Alphacool has provided some RPM-PWM numbers as well which is better than simply providing rated max speed. I do wish the fans used something more reliable than sleeve bearings which are not as reliable in the long term- especially in a horizontal orientation and something that these coolers would be subject to often in most ATX specification cases. The warranty of 1 year, as with other Alphacool products, is not going to provide a lot of confidence here either. Seeing as how long term reliability testing is not practically possible here, I will leave it here and not discuss it further. The cooler is compatible with all end user Intel and AMD sockets released in the last 5 years, and more, out of the box with no special mounting kits required. The only exception here is LGA 2011(-3) narrow ILM which a certain ASROCK x99 m-ITX motherboard uses, along with more server class motherboards, where you would have to purchase the adapter separately.

Edit: There is now a product page for the Eisbaer 240 and other Eisbaer models on the Alphacool website, but the specifications listed above still cover everything mentioned.

Let’s take a good look at the cooler now on the next page.

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