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Comparisons
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Liquid CPU Coolers: °C Rise Comparison (pump at full speed)
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Cooler
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SPL (dBA@1m)
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24
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23
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22
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21
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20
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Corsair Hydro H50
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44
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-
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47
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-
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Antec Kühler H20 620
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-
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-
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42
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-
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44
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Antec Kühler H20 920
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-
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-
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41
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-
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-
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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.
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Single Fan CPU Coolers (ref. 120mm fan): °C Rise Comparison
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Heatsink
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Fan voltage / SPL @1m
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12V
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9V
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7V
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16 dBA
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13 dBA
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12 dBA
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Thermalright Ultra-120 eXtreme Rev.C
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38
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40
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43
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Thermalright Venomous X
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38
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41
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43
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Prolimatech Megahalems
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38
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41
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44
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Noctua NH-U12P
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39
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42
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44
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Scythe Mugen-2
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39
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42
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45
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Cogage TRUE Spirit 1366
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40
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42
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45
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Prolimatech Armageddon
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40
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42
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46
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Zalman CNPS10X Quiet
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40
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43
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46
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Scythe Yasya
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41
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43
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47
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Thermalright Ultra-120 eXtreme
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40
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43
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48
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Cooler Master Hyper 212 Plus
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41
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44
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48
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Thermalright Ultra-120
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42
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45
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49
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Titan Fenrir
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43
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46
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50
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Scythe Ninja 3
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44
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47
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49
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Noctua NH-C12P
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43
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47
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51
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Zalman CNPS10X Extreme
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43
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47
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53
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Swiftech Polaris 120
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46
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49
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54
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Zalman CNPS10X Flex
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45
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50
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54
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Cooler Master V8
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46
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50
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54
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Scythe Grand Kama Cross
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45
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52
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57
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Antec Kühler H20 620
(stock fan, pump at 7V)
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47
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|
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Arctic Cooling Freezer Xtreme Rev.2
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49
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52
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58
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Scythe Kabuto
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51
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53
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60
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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.
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°C Rise Comparison vs. Dual Fan 140 mm Coolers (reference fans)
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Heatsink
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Fan Voltage / SPL*
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8V
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7V
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6V
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18~20 dBA
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15~17 dBA
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12~14 dBA
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Prolimatech Genesis
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36
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37
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39
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Noctua NH-C14
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37
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39
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41
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Thermalright Silver Arrow
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37
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39
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41
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Noctua NH-D14
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38
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40
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42
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Thermalright Venomous X
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39
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41
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42
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NZXT Havik 140
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39
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40
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43
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Antec Kühler H20 620 (stock fan, pump at 7V)
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44
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47
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*Note: there are minor differences in measured SPL due to the variety of fan orientations and mounting methods offered by the compared coolers.
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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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