Antec Kühler H20 620 & 920 CPU Water Cooling Units

Cooling
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Comparisons

Liquid CPU Coolers: °C Rise Comparison (pump at full speed)
Cooler
SPL (dBA@1m)
24
23
22
21
20
Corsair Hydro H50
44
-
47
-
Antec Kühler H20 620
-
-
42
-
44
Antec Kühler H20 920
-
-
41
-
-

Compared to the Hydro H50, both Kühlers come out smelling like roses. When generating around 22 dBA@1m, the 620 and 920 run 5°C and 6°C cooler respectively. This is due in large part to their quieter pumps which allow for higher fan speeds.

Single Fan CPU Coolers (ref. 120mm fan): °C Rise Comparison
Heatsink
Fan voltage / SPL @1m
12V
9V
7V
16 dBA
13 dBA
12 dBA
Thermalright Ultra-120 eXtreme Rev.C
38
40
43
Thermalright Venomous X
38
41
43
Prolimatech Megahalems
38
41
44
Noctua NH-U12P
39
42
44
Scythe Mugen-2
39
42
45
Cogage TRUE Spirit 1366
40
42
45
Prolimatech Armageddon
40
42
46
Zalman CNPS10X Quiet
40
43
46
Scythe Yasya
41
43
47
Thermalright Ultra-120 eXtreme
40
43
48
Cooler Master Hyper 212 Plus
41
44
48
Thermalright Ultra-120
42
45
49
Titan Fenrir
43
46
50
Scythe Ninja 3
44
47
49
Noctua NH-C12P
43
47
51
Zalman CNPS10X Extreme
43
47
53
Swiftech Polaris 120
46
49
54
Zalman CNPS10X Flex
45
50
54
Cooler Master V8
46
50
54
Scythe Grand Kama Cross
45
52
57
Antec Kühler H20 620
(stock fan, pump at 7V)
47
   
Arctic Cooling Freezer Xtreme Rev.2
49
52
58
Scythe Kabuto
51
53
60

The Kühler 620 fares quite poorly against the majority of single 120 mm fan tower heatsinks. At 16 dBA@1m (stock fan at 5V, pump at 7V) it produced a thermal rise of 47°C which places two spots ahead of last just above the Freezer Xtreme Rev.2.

°C Rise Comparison vs. Dual Fan 140 mm Coolers (reference fans)
Heatsink
Fan Voltage / SPL*
8V
7V
6V
18~20 dBA
15~17 dBA
12~14 dBA
Prolimatech Genesis
36
37
39
Noctua NH-C14
37
39
41
Thermalright Silver Arrow
37
39
41
Noctua NH-D14
38
40
42
Thermalright Venomous X
39
41
42
NZXT Havik 140
39
40
43
Antec Kühler H20 620 (stock fan, pump at 7V)
44
47
 
*Note: there are minor differences in measured SPL due to the variety of fan orientations and mounting methods offered by the compared coolers.

In a showdown against top-end dual fan heatsinks, the Kühler 920 doesn't do very well either, achieving results 5~7°C higher than the NZXT Havik 140.

Now undoubtedly we will be inundated with comments about how these water cooling systems perform much better inside a case. You can also make the argument that these closed loop liquid coolers take up a 120 mm fan placement which could otherwise be used by a system exhaust fan which would give air-cooled heatsinks a leg up. We don't test to see how coolers perform in one particular case layout with fans A, B, and C helping out, but how they perform against one another in as pure a form as possible. Our open testbed was deliberately chosen to eliminate these variables from the cooling equation.



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