The Alphacool Eisbaer 240 CPU AIO Liquid Cooler Review
by E. Fylladitakis on August 1, 2016 9:00 AM EST- Posted in
- Cases/Cooling/PSUs
- AIO
- Water Cooling
- Cooler
- Alphacool
Testing Methodology
Although the testing of a cooler appears to be a simple task, that could not be much further from the truth. Proper thermal testing cannot be performed with a cooler mounted on a single chip, for multiple reasons. Some of these reasons include the instability of the thermal load and the inability to fully control and or monitor it, as well as the inaccuracy of the chip-integrated sensors. It is also impossible to compare results taken on different chips, let alone entirely different systems, which is a great problem when testing computer coolers, as the hardware changes every several months. Finally, testing a cooler on a typical system prevents the tester from assessing the most vital characteristic of a cooler, its absolute thermal resistance.
The absolute thermal resistance defines the absolute performance of a heatsink by indicating the temperature rise per unit of power, in our case in degrees Celsius per Watt (°C/W). In layman's terms, if the thermal resistance of a heatsink is known, the user can assess the highest possible temperature rise of a chip over ambient by simply multiplying the maximum thermal design power (TDP) rating of the chip with it. Extracting the absolute thermal resistance of a cooler however is no simple task, as the load has to be perfectly even, steady and variable, as the thermal resistance also varies depending on the magnitude of the thermal load. Therefore, even if it would be possible to assess the thermal resistance of a cooler while it is mounted on a working chip, it would not suffice, as a large change of the thermal load can yield much different results.
Appropriate thermal testing requires the creation of a proper testing station and the use of laboratory-grade equipment. Therefore, we created a thermal testing platform with a fully controllable thermal energy source that may be used to test any kind of cooler, regardless of its design and or compatibility. The thermal cartridge inside the core of our testing station can have its power adjusted between 60 W and 340 W, in 2 W increments (and it never throttles). Furthermore, monitoring and logging of the testing process via software minimizes the possibility of human errors during testing. A multifunction data acquisition module (DAQ) is responsible for the automatic or the manual control of the testing equipment, the acquisition of the ambient and the in-core temperatures via PT100 sensors, the logging of the test results and the mathematical extraction of performance figures.
Finally, as noise measurements are a bit tricky, their measurement is being performed only manually. Fans can have significant variations in speed from their rated values, thus their actual speed during the thermal testing is being acquired via a laser tachometer. The fans (and pumps, when applicable) are being powered via an adjustable, fanless desktop DC power supply and noise measurements are being taken 1 meter away from the cooler, in a straight line ahead from its fan engine. At this point we should also note that the Decibel scale is logarithmic, which means that roughly every 3 dB(A) the sound pressure doubles. Therefore, the difference of sound pressure between 30 dB(A) and 60 dB(A) is not "twice as much" but nearly a thousand times greater. The table below should help you cross-reference our test results with real-life situations.
The noise floor of our recording equipment is 30.2-30.4 dB(A), which represents a medium-sized room without any active noise sources. All of our acoustic testing takes place during night hours, minimizing the possibility of external disruptions.
| <35dB(A) | Virtually inaudible |
| 35-38dB(A) | Very quiet (whisper-slight humming) |
| 38-40dB(A) | Quiet (relatively comfortable - humming) |
| 40-44dB(A) | Normal (humming noise, above comfortable for a large % of users) |
| 44-47dB(A)* | Loud* (strong aerodynamic noise) |
| 47-50dB(A) | Very loud (strong whining noise) |
| 50-54dB(A) | Extremely loud (painfully distracting for the vast majority of users) |
| >54dB(A) | Intolerable for home/office use, special applications only. |
*noise levels above this are not suggested for daily use
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ikjadoon - Tuesday, August 2, 2016 - link
You're behind. :( Already a 120mm rad with 2 fans is both 5C cooler and 0.1dB quieter than your Noctua NH-U14S.http://www.hardocp.com/article/2016/02/11/arctic_c...
FWIW, I also have a NH-U14S. Noctua buddies! :D
ikjadoon - Tuesday, August 2, 2016 - link
Nope. You are stuck in 2014. :( Gen5 Asetek is very good.5C cooler than the NH-U14S and 0.1db quieter. Maybe has other flaws...but it's not noise!
ikjadoon - Tuesday, August 2, 2016 - link
Forgot the damn link:http://www.hardocp.com/article/2016/02/11/arctic_c...
ikjadoon - Monday, August 1, 2016 - link
LOL. Using water-cooling on a CPU? You all gobbled up the marketing; you still believe in in 1990s ATX case design.GPUs need the water, not the CPU. 250W+ on load, using 9cm fans? Average load temps in the 70s with overclocking and overvoltage? Right, yes, put the water cooler on the CPU. :p
Abandon ATX cooling assumptions; it was meant for cooling Pentium 4's and 3.5" spindle disks.
wylie102 - Monday, August 29, 2016 - link
From what I've read you are right about this. My question would be - given that air CPU coolers vent/radiate their hot air into the case, as do graphics cards (open air designs at least) would it not be beneficial to have an AIO liquid cooler drawing in air from the case (it being warm shouldn't affect the CPU cooling too much as like you said, most units are more than capable) and venting it out of the case?Would this not provide a benefit to the temp of the case and therefore the cooling abilities of the graphics card (particularly if running SLI)? And doesn't it make sense to have the CPU do this given that cooling options are much more widely available for them and at less of a premium than GPU water cooling?
Hxx - Monday, August 1, 2016 - link
AIO coolers are still very much needed these days especially in a smaller form factor where air flow is not as great as in a larger case. I personally think that air coolers have reached their EOL. There is no need for a big chunk of metal to sit on top of your motherboard especially when nowadays you can buy an excellent AIO that is reasonably priced, quiet, cools better, and looks aesthetically more pleasing, and its painless to install.there used to be a time when AIOs used to be so much more money, kind of like how it is now if you want to jump into a custom loop. There is a price to performance ratio that needs to be addressed. But as far as closed loops, some of them are almost just as inexpensive as an air cooler and providing much more benefits.
retrospooty - Monday, August 1, 2016 - link
I dont think so... When talking about building a new system, we are talking Intel Skylake CPU. Anything running a Skylake is already cool as hell. There are some great small form factor cases and premade systems, as small as Lenovo Tiny Desktop that are running quad core i5 and i7 desktop processors. They are a little over 1 inch thick and dont even get hot. You would only need it if you had both a really thin/small case AND you were significantly overclocking it... Now if you bought a good enough motherboard to significantly overclock it, what case are you getting that is too small to fit a decent air cooler, but big enough where it can still fit a decent power supply that can handle significant overclocking and even a small AIO water cooler? Where is the radiator in this setup? Is it outside the case?ikjadoon - Tuesday, August 2, 2016 - link
...there are strong ITX overclocking motherboards. You don't need 1kW to OC; even SFX PSUs are in the 700W range, more than enough for dual-GPU OC + 8-core CPU OC.retrospooty - Tuesday, August 2, 2016 - link
I get that, but still what is the point? If you are overclokcing to that level, you probably arent using a tiny case. If you are, that fine, but again I ask - Where is the radiator in this setup? Is it outside the case?Sushisamurai - Sunday, August 7, 2016 - link
I'm running a tri-fire and 6core CPU. I should have a custom loop on the GPU's, but... whatever, they're too old now to drop that much money into them. Full load is close to 1000W - it's potentially a lot of heat, but radiator's are in the case, with a lot of airflow. GPU's hit 80 degrees and CPU's @60.