Cooler Master Seidon 240M CPU Cooler Review
By Rafael Otto Coelho on June 26, 2013
The Cooler Master Seidon 240M is a liquid cooling system for processors. It has a 240 mm radiator with two 120 mm fans side-by-side. Let’s test it.
As with any sealed liquid cooling system, the Seidon 240M comes with the coolant liquid pre-filled inside the loop (block, radiator, pump, and hoses). We recently tested two versions of this product, the Seidon 120M and the Seidon 120XL, both with 120 mm radiators; the Seidon 240M has a longer 240 mm radiator. To be more accurate, we say “a 240 mm radiator” because it is designed to be cooled by two 120 mm side-by side fans.
Figure 1 shows the box of the Cooler Master Seidon 240M.
Figure 2 shows the contents of the box: the radiator-block set, fans, a Y-harness, a rubber frame to install between the fans and the radiator, a manual, a small syringe of thermal compound, and installation hardware.
This watercooler is discussed in detail in the following pages.
The sealed radiator-block system is shown in Figure 3. At the left is the radiator that transfers the heat from the liquid to the air; at the right you can see the block that transfers the heat from the CPU to the circulating liquid. There is a cable on the block with a three-pin connector, which draws power for the integrated pump.
Figures 4 and 5 reveal the 240 mm radiator of the Cooler Master Seidon 240M.
Figure 6 shows the top of the block, where the pump that makes the liquid flow is integrated. There is a blue LED that glows while the pump is working.
The base of the block, which is made of copper, is revealed in Figure 7. Unlike most sealed liquid cooling systems, the thermal compound does not come preapplied. The base is not mirrored.
Figure 8 illustrates the 120 mm PWM fans that come with the Cooler Master Seidon 240M, model DF1202512RFUN (120 mm, rifle bearing, 2,400 rpm, 4.44 W, 86.15 cfm, 40 dBA.)
In Figure 9, you can see the backplate for installing the Seidon 240M on Intel socket LGA775, LGA1150, LGA1155, LGA1156, and LGA1366 systems. Socket LGA2011 CPUs use the stock backplate. There is also a backplate for AMD computers.
In order to install the cooler, you have to attach two holders to the block. Figure 10 shows the holders for Intel systems attached to the block; there is also a pair of holders for use with AMD processors. You can also see the fans attached to the radiator.
Put the backplate on the solder side of the motherboard, and install the four nuts shown in Figure 11 on the component side.
The last step is to install the system inside the computer, attaching the block on the CPU and the radiator on the top panel. We installed the fans both blowing outwards.
We tested the cooler with a Core i5-2500K CPU (quad-core, 3.3 GHz), which is a socket LGA1155 processor with a 95 W TDP (Thermal Design Power). In order to get higher thermal dissipation, we overclocked it to 4.0 GHz (100 MHz base clock and x40 multiplier), with 1.3 V core voltage (Vcore). This CPU was able to reach 4.8 GHz with its default core voltage, but at this setting, the processor enters thermal throttling when using mainstream coolers, reducing the clock and thus the thermal dissipation. This could interfere with the temperature readings, so we chose to maintain a moderate overclocking.
We measured noise and temperature with the CPU under full load. In order to get 100% CPU usage in all cores, we ran Prime 95 25.11 with the “In-place Large FFTs” option. (In this version, the software uses all available threads.)
We compared the tested cooler to other coolers we already tested, and to the stock cooler that comes with the Core i5-2500K CPU. Note that the results cannot be compared to measures taken on a different hardware configuration, so we retested some “old” coolers with this new methodology. This means you can find different values in older reviews than the values you will read on the next page. Every cooler was tested with the thermal compound that comes with it.
Room temperature measurements were taken with a digital thermometer. The core temperature was read with the SpeedFan program (available from the CPU thermal sensors), using an arithmetic average of the core temperature readings.
During the tests, the panels of the computer case were closed. The front and rear case fans were spinning at minimum speed in order to simulate the “normal” cooler use on a well-ventilated case. We assume that is the common setup used by a cooling enthusiast or overclocker.
The sound pressure level (SPL) was measured with a digital noise meter, with its sensor placed near the top opening of the case. This measurement is only for comparison purposes, because a precise SPL measurement needs to be made inside an acoustically insulated room with no other noise sources, which is not the case here.
Operating System Configuration
We adopted a 2°C error margin, meaning temperature differences below 2°C are considered irrelevant.
The table below presents the results of our measurements. We repeated the same test on all coolers listed below. Each measurement was taken with the CPU at full load. In the models with a fan supporting PWM, the motherboard controlled the fan speed according to core load and temperature. On coolers with an integrated fan controller, the fan was set at the full speed.
|Cooler||Room Temp.||Noise||Speed||Core Temp.||Temp. Diff.|
|Intel stock cooler||18 °C||41 dBA||2000 rpm||97 °C||79 °C|
|Cooler Master Hyper TX3||18 °C||50 dBA||2850 rpm||69 ºC||51 °C|
|Corsair A70||23 °C||51 dBA||2000 rpm||66 ºC||43 °C|
|Corsair H100||26 °C||62 dBA||2000 rpm||64 ºC||38 °C|
|EVGA Superclock||26 °C||57 dBA||2550 rpm||67 ºC||41 °C|
|NZXT HAVIK 140||20 °C||46 dBA||1250 rpm||65 ºC||45 °C|
|Thermalright True Spirit 120||26 °C||42 dBA||1500 rpm||82 °C||56 °C|
|Zalman CNPS12X||26 °C||43 dBA||1200 rpm||71 °C||45 °C|
|Zalman CNPS9900 Max||20 °C||51 dBA||1700 rpm||62 °C||42 °C|
|Titan Fenrir Siberia Edition||22 °C||50 dBA||2400 rpm||65 °C||43 °C|
|SilenX EFZ-120HA5||18 °C||44 dBA||1500 rpm||70 °C||52 °C|
|Noctua NH-L12||20 °C||44 dBA||1450 rpm||70 °C||50 °C|
|Zalman CNPS8900 Extreme||21 °C||53 dBA||2550 rpm||71 °C||50 °C|
|Gamer Storm Assassin||15 °C||48 dBA||1450 rpm||58 °C||43 °C|
|Deepcool Gammaxx 400||15 °C||44 dBA||1500 rpm||60 °C||45 °C|
|Cooler Master TPC 812||23 °C||51 dBA||2350 rpm||66 °C||43 °C|
|Deepcool Gammaxx 300||18 °C||43 dBA||1650 rpm||74 °C||56 °C|
|Intel stock cooler||18 °C||41 dBA||2000 rpm||97 °C||79 °C|
|Xigmatek Praeton||19 °C||52 dBA||2900 rpm||83 °C||64 °C|
|Noctua NH-U12P SE2||18 °C||42 dBA||1300 rpm||69 °C||51 °C|
|Deepcool Frostwin||24 °C||46 dBA||1650 rpm||78 °C||54 °C|
|Thermaltake Frio Advanced||13 °C||56 dBA||2000 rpm||62 °C||49 °C|
|Xigmatek Dark Knight Night Hawk Edition||9 °C||48 dBA||2100 rpm||53 °C||44 °C|
|Thermaltake Frio Extreme||21 °C||53 dBA||1750 rpm||59 °C||38 °C|
|Noctua NH-U9B SE2||12 °C||44 dBA||1700 rpm||64 °C||52 °C|
|Thermaltake WATER2.0 Pro||15 °C||54 dBA||2000 rpm||52 °C||37 °C|
|Deepcool Fiend Shark||18 °C||45 dBA||1500 rpm||74 °C||56 °C|
|Arctic Freezer i30||13 °C||42 dBA||1350 rpm||63 °C||50 °C|
|Spire TME III||8 °C||46 dBA||1700 rpm||70 °C||62 °C|
|Thermaltake WATER2.0 Performer||11 °C||54 dBA||2000 rpm||49 °C||38 °C|
|Arctic Alpine 11 PLUS||11 °C||45 dBA||2000 rpm||82 °C||71 °C|
|be quiet! Dark Rock 2||10 °C||41 dBA||1300 rpm||58 °C||48 °C|
|Phanteks PH-TC14CS||16 °C||47 dBA||1300 rpm||58 °C||42 °C|
|Phanteks PH-TC14PE||16 °C||48 dBA||1300 rpm||57 °C||41 °C|
|SilverStone HE01 (Q)||19 °C||44 dBA||1150 rpm||63 °C||44 °C|
|SilverStone HE01 (P)||20 °C||57 dBA||2050 rpm||62 °C||42 °C|
|Thermaltake WATER2.0 Extreme (S)||17 °C||44 dBA||1250 rpm||52 °C||35 °C|
|Thermaltake WATER2.0 Extreme (E)||17 °C||53 dBA||1900 rpm||50 °C||33 °C|
|Deepcool Neptwin||11 °C||46 dBA||1500 rpm||56 °C||45 °C|
|SilverStone HE02||19 °C||49 dBA||2000 rpm||64 °C||45 °C|
|Zalman CNPS9900DF||23 °C||45 dBA||1400 rpm||68 °C||45 °C|
|Deepcool ICE BLADE PRO V2.0||22 °C||43 dBA||1500 rpm||67 °C||45 °C|
|Phanteks PH-TC90LS||24 °C||47 dBA||2600 rpm||95 °C||71 °C|
|Rosewill AIOLOS||20 °C||40 dBA||1600 rpm||94 °C||74 °C|
|Corsair H60||20 °C||49 dBA||2000 rpm||64 °C||44 °C|
|Zalman LQ310||27 °C||51 dBA||2050 rpm||65 °C||38 °C|
|Noctua NH-L9i||24 °C||44 dBA||2500 rpm||95 °C||71 °C|
|NZXT Respire T40||20 °C||45 dBA||1850 rpm||76 °C||56 °C|
|NZXT Respire T20||21 °C||45 dBA||1900 rpm||77 °C||56 °C|
|Zalman LQ315||20 °C||52 dBA||1950 rpm||57 °C||37 °C|
|Corsair H80i (Quiet)||19 °C||44 dBA||1100 rpm||61 °C||42 °C|
|Corsair H80i (Maximum)||19 °C||57 dBA||2500 rpm||55 °C||36 °C|
|NZXT Kraken X40 (Silent)||25 °C||44 dBA||1050 rpm||66 °C||41 °C|
|NZXT Kraken X40 (Extreme)||25 °C||53 dBA||1650 rpm||62 °C||37 °C|
|Zalman LQ320||20 °C||52 dBA||2100 rpm||57 °C||37 °C|
|Corsair H100i (Quiet)||22 °C||45 dBA||1150 rpm||58 °C||36 °C|
|Corsair H100i (Maximum)||22 °C||61 dBA||2500 rpm||54 °C||32 °C|
|NZXT Kraken X60 (Silent)||26 °C||46 dBA||1000 rpm||62 °C||36 °C|
|NZXT Kraken X60 (Extreme)||26 °C||60 dBA||1650 rpm||60 °C||34 °C|
|Prolimatech Genesis Black Series||25 °C||46 dBA||1150 rpm||69 °C||44 °C|
|Phanteks PH-TC12DX||25 °C||51 dBA||1850 rpm||74 °C||49 °C|
|Corsair H90||23 °C||51 dBA||1550 rpm||61 °C||38 °C|
|Corsair H110||27 °C||58 dBA||1500 rpm||60 °C||33 °C|
|Evercool Venti||23 °C||49 dBA||2250 rpm||72 °C||49 °C|
|Thermalright Archon SB-E X2||22 °C||45 dBA||1400 rpm||68 °C||46 °C|
|Scythe Kabuto II||20 °C||41 dBA||1450 rpm||67 °C||47 °C|
|Prolimatech Megahalems Red Series||20 °C||51 dBA||1500 rpm||63 °C||43 °C|
|Zalman FX100 (fanless)||18 °C||NA||NA||98 °C||80 °C|
|Zalman FX100 (92 mm fan)||18 °C||50 dBA||2850 rpm||69 °C||51 °C|
|Gelid The Black Edition||21 °C||45 dBA||1650 rpm||66 °C||45 °C|
|Thermalright AXP-100||22 °C||42 dBA||2400 rpm||76 °C||54 °C|
|SilverStone NT06-PRO||19 °C||50 dBA||2400 rpm||72 °C||53 °C|
|SilverStone AR01||11 °C||46 dBA||2150 rpm||53 °C||42 °C|
|Cooler Master Seidon 120M||16 °C||52 dBA||2300 rpm||58 °C||42 °C|
|Enermax ETS-T40-White Cluster||16 °C||50 dBA||2200 rpm||63 °C||47 °C|
|Cooler Master Seidon 120XL||17 °C||54 dBA||2250 rpm||55 °C||38 °C|
|Cooler Master Seidon 240M||13 °C||59 dBA||2200 rpm||49 °C||36 °C|
In the graph below, you can see how many degrees Celsius hotter the CPU core is than the air outside the case. The lower this difference, the better is the performance of the cooler.
In the graph below, you can see how many decibels of noise each cooler makes.
The main specifications for the Cooler Master Seidon 240M CPU cooler include:
* Researched at Newegg.com on the day we published this review.
The Cooler Master Seidon 240M can be called a top shelf liquid cooling system. It performed almost as well as the best watercoolers we have tested to date. It is also easy to install and relatively affordable.
The main problem with the Seidon 240M is that its fans are very loud at full speed, but that is a problem it shares with its competitors. It also lacks an automatic fan controller or temperature monitoring system, which is a negative only if those features are important to you.
The Cooler Master Seidon 240M receives the Hardware Secrets Silver Award.