Antec Kühler H20 620 & 920 CPU Water Cooling Units

Cooling
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Cooling Results

Antec Kühler H20 620
Voltage
Thermal Rise
SPL @1m
Fan
Pump
Stock 120mm Fan
12V
12V
37°C
33 dBA
9V
39°C
27~28 dBA
7V
42°C
22 dBA
6V
44°C
20 dBA
7V
44°C
18~19 dBA
5V
12V
47°C
19 dBA
7V
47°C
16 dBA
Reference 120mm Fan (Nexus)
12V
12V
41°C
20~21 dBA
9V
45°C
20 dBA
7V
47°C
19~20 dBA
9V
12V
46°C
17 dBA
9V
48°C
16 dBA
7V
51°C
15~16 dBA
7V
12V
52°C
16 dBA
9V
52°C
14 dBA
7V
53°C
13 dBA

The Kühler 620 performed very well at high fan speeds producing a thermal rise under 40°C (excellent for our test platform); however, noise levels were very high. With the stock fan slowed to produce 20 dBA@1m or lower, the thermal rise increased to 44~47°C. The pump speed had no impact in performance when coupled with the fan running at 6V and below (above that level the pump starts to get drowned out, so you might as well leave it running at max).

Our reference Nexus fan on the other hand was very much dependent on the pump speed to achieve good results. With the fan speed at 12V and 9V, temperatures were 5~6°C higher when the pump was undervolted from 12V to 7V. When the fan became the performance bottleneck at 7V as the speed of the pump had almost no effect. Overall our reference fan performed on par with the stock model at comparable noise levels..


The Kühler 620 measured 18~19 dBA@1m with the pump at 7V and the stock fan at 6V.


Antec Kühler H20 920
Voltage
Thermal Rise
SPL @1m
Fan
Pump
Stock 120mm Fans
12V
12V
33°C
48~49 dBA
9V
34°C
42 dBA
7V
36°C
32 dBA
6V
38°C
26~27 dBA
5.6V
41°C
22 dBA
7V
41°C
19 dBA
Reference 120mm Fans (Nexus)
12V
12V
40°C
25 dBA
7V
41°C
23 dBA
9V
12V
43°C
23 dBA
7V
44°C
18~19 dBA
7V
12V
48°C
22 dBA
7V
48°C
17 dBA

The Kühler H20 920, given its larger size and two fans, gave us similar results, excelling primarily at higher fan speeds. It kept things noticeably cooler when the pump and fan were slowed to generate less than 20 dBA@1m though. Once again, undervolting the pump didn't have any negative consequences when using the stock fans.

The pump's speed was also a non-factor with our reference Nexus fans as there was a 1°C difference at most when the pump's voltage was decreased to 7V. On the 920, the stock fans excelled, producing lower temperatures at similar noise levels. This is surprising given their history of superiority over the stock fans of most tested heatsinks. It seems the stock fans are well suited for cooling down the tight fin spacing of the 920's radiator.


The Kühler 620 measured 19 dBA@1m with the pump at 7V and the stock fan at 5.6V.



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