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What should i do with my watercooling? 240MM as intake or 120MM as exhaust?

I'm going to upgrade my FX-8350 to a I5-7500, i've heard that the i5 will produce more heat.
I've got a LEPA AQUACHANGER 120MM as the exhaust but my airflow is really bad, also one of the reason why i'm also changing case and fans/

I'm going to build with an B250-PLUS ATX 1151 motherboard in a S340 Red/Black edition of NZXT

My lepa waterchanger is dying, the pump has gone bad.
I'm going to have 2 140MM fans as the intake and 1 140MM as exhaust(top) and 1 120MM as exhaust(rear)

I'm questioning if i should buy the Cooler Master Seidon 240MM as the only intake, or 1 120MM Cooler Master Seidon v.2 as the rear exhaust fan. i've been struggling to find an answer on what's the best for cooling. I want my CPU to be at good temperatures and my other components not to overheat ofcourse.
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More about watercooling 240mm intake 120mm exhaust
  1. I've also got no interests in changing to air coolers. That's because i really like the look of the watercooling and i want to stick to that. I also had bad experience with the Hyper 212 EVO. Afraid to go back to air coolers again.
    Reply to CravityGaming
  2. The FX-8350 (a 125W TDP CPU) will produce more heat than the i5-7500 (a 65W TDP CPU). In fact, the stock cooler that comes in the box of the i5-7500 will suffice, as you won't be able to overclock that locked CPU anyway, so, no need for liquid cooling for that.

    If you are really sure you want to get the i5-7500 (note that the i5's have lesser price/performance versus the Ryzen 5 CPUs, which are overclockable and has higher core/thread counts), you can either just: 1) get a 120mm AIO, such as the Seidon (costs ~$60) or, I know you said you don't want air cooling, but, 2) get a Cryorig M9i (only costs ~$20).

    The 240mm AIO would be more ideal for an unlocked CPU (such as the i5-7600K or i7-7700K, paired with a Z270 motherboard).
    Reply to raisonjohn
  3. The reason why i'm going for an INTEL CPU is because i've been wanting to try INTEL for a long time, i've only been running on AMD CPU's for a long time. I just want to experience what it's like. I know that the ryzen 5 is a better option. But the thing is: The seidon 240MM is 10 euro's more expensive than the 120MM version. I'm also not into overclocking, i know it can improve the performance, but i'm not looking for an overclock. I just want the water cooler for how it looks and because i'm used to them. So, answer this question for me please:


    1rear exhaust 120MM
    1top exhaust 140MM
    240MM seidon as intake

    or

    2x140MM intake
    1x140MM top exhaust
    1x120MM exhaust/120MM seidon radiator?
    Reply to CravityGaming
  4. Best answer
    Best choice between the two given setups, considering your preference to use Intel locked CPU and an AIO for its aesthetics, as well as the NZXT S340 case that you are going to build this rig on, is the second setup, i.e.,:

    2x 140mm intake
    1x 140mm top exhaust
    1x 120mm exhaust/120mm seidon radiator


    Reasons why (in no particular order):

    1) The radiator support for the NZXT S340 case is either 120mm at the rear (exhaust) or 240mm/280mm at the front (intake). As the rear exhaust is closer to the CPU block, the AIO's tubing will not have to cross farther all the way in front of the RAM sticks toward the front. If you can be creative in tying such tubing at a shorter distance to the rear exhaust, it would make for a much cleaner build (and less obstruction in airflow).

    2) Speaking of airflow, when you use the 240mm radiator up front in the NZXT case, you would have to use 2x static pressure fans as radiator fans, instead of 2x airflow fans. This effectively diminishes the amount of air going inside your case to cool your other components as static pressure fans known for higher pressure at lower airflow. Not to mention, the radiator itself would block direct airflow of the intake fans to the other components being cooled. On the other hand, if you mount a 120mm radiator as exhaust, your only static pressure fan will be such radiator fan. Then, you can use 2x high airflow fans for the front intake which will improve the cooling of your very open case interior, directly cooling your components more effectively.

    3) As previously stated, you won't need that much 240mm x 120mm radiator surface area to cool a low-TDP locked CPU. As such, a 120mm x 120mm radiator will suffice, if you prefer an AIO solution for its aesthetics. Note that most, if not all, AIO's recommend installing the radiator/fans as intake. The purpose of which is to let much cooler ambient air to dissipate the heat generated by your CPU. This setup results in lower CPU temperature but slightly warmer GPU/motherboard temperature. Other builder's opt to use radiators/fans as exhaust, wherein, the slightly warmer interior case air will be the one to cool the CPU. This setup results in slightly higher CPU temperature but lower GPU/motherboard temperature. Since your CPU will not generate high temps, using the Seidon as exhaust would be the better option it will bring your GPU/motherboard temps down.

    4) Your savings of 10 euros for the 120mm Seidon can be used to purchase other components (like extra case fans). Note, however, that the NZXT S340 comes with 2x 120mm FN V2 45cfm pre-installed case fans already. To save on additional expenses, you can even use both those fans, if such airflow/fan design is acceptable to you, as your 2x front intakes (instead of buying 2x 140mm) - and only need to get 1 more fan (120mm or 140mm) for the top exhaust.
    Reply to raisonjohn
  5. Thanks alot for that answer i forgot to mention that i will purchase 2 140SP fans from corsair, 1 140AF as the top exhaust and 1 120SP for the rear radiator exhaust. If i were to go with the 240 in the front i would have 2 SP120 attached to it, 1 140AF at the top and 1 120AF in the back
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  6. But if i will put it as the 120MM exhaust, is it better to go with 2 AF intakes or 2 SP intakes? Will 2 120MM fans from corsair be enough too? Or is it really a big difference between the 120 and 140 for cooling. I know that the 140 will be quieter. I'm just curious for the cooling
    Reply to CravityGaming
  7. SP (Static Pressure) fans for radiators; AF (Air Flow) fans for all the rest.

    The Corsair 120mm AF120 (the non-LEDs) has two editions: the AF120 Performance Edition (0.13A draw, ~63cfm and ~30dBA at 1650rpm max.) and the AF120 Quiet Edition (0.08A draw, ~40cfm and ~21dBA at 1100rpm max.).

    The Corsair 140mm AF140 (the non-LEDs) only has the AF140 Quiet Edition (0.10A draw, ~68cfm and ~24dBA at 1150rpm max.).

    If you compare the noise levels of the three AF fan types, the AF120 Quiet Edition actually produces the least amount of noise due to its lowest rpm/speed (followed closely by the AF140), while the AF120 Performance Edition produces the most noise due to its highest rpm/speed.

    As far as cooling is concern, the AF140 produces the most amount of airflow (followed closely by the AF120 Performance Edition), while the AF120 Quiet Edition produces the least amount of airflow.

    So, if you consider cooling-performance/noise-levels, the AF140 is the best among the three AF fan types.

    Similarly, the Corsair 120mm SP120 (non-LED) has two editions: the SP120 High Performance Edition (0.18A draw, ~63cfm and ~35dBA at 2350rpm max.) and the SP120 Quiet Edition (0.08A draw, ~38cfm and ~23dBA at 1450rpm max.).

    If I were to select which fans to install using just the Corsair AF/SP fan series you are considering, I would get:

    2x Corsair 140mm AF140 Quiet Edition = Front Intakes
    1x Corsair 120mm AF120 Quiet Edition = Top Exhaust
    1x Corsair 120mm SP120 Quiet Edition = Radiator Fan / Rear Exhaust


    Theoretically, this gives you a "positive" airflow with the 2x AF140's at 68cfm + 68cfm = 136cfm total intake airflow (at max. rpm) and with the 1x AF120 + 1x SP120 at 40cfm + 38cfm = 78cfm total exhaust airflow (at max. rpm). Getting all the quiet edition also ensures lower noise levels (and lower power draw).
    Reply to raisonjohn
  8. I'm going to take the RED LED one's. The Corsair Air Series SP120 LED High Static Pressure Edition, Case fan to be precise. It's 3DB louder than the original quiet edition of the 120SP( 97,3 m³/h 57,24 cfm). As for the 2x140MM in the front 2X Corsair AF140 Quiet Edition red LED fan (112,8 m³/h 66,4 cfm). And as the top exhaust i will be having: Corsair AF120 Quiet Edition red LED fan, Case fan (88,7 m³/h 52,19 cfm) Will that all be alright?
    Reply to CravityGaming
  9. Yes, if you prefer the LED versions (for prioritizing aesthetics, but sacrificing a bit of noise and power draw), you can still achieve "positive" pressure.

    The 2x AF140 Red LEDs (front intakes) would be 66.4cfm + 66.4cfm = ~133cfm
    The 1x AF120 Red LED (top exhaust) + the 1x SP120 Red LED (rad/rear exhaust) would be 52.19cfm + 57.24cfm = ~109cfm
    Reply to raisonjohn
  10. I can also go with a 140MM at the top, is that a better solution or does it not really matter that much? There's also 1 more thing i've been struggling with. I've got the B250-PLUS motherboard, 1151 socket. It's only got 3 FAN headers, 1 CPU_FAN, 2CHA_FANS (Chassis fans) I've got 2 140MM's in the front and 2 120MM's in the back. I also have to plug the pump in the CPU_FAN header. but i still need 2 more headers, do you know any like splitters i could use that are black or red sleeved?
    Reply to CravityGaming
  11. Motherboard fan headers are typically rated at 1A max. You can safely plug several fans, via splitters, running of one mobo header as long as the total amp draw of the connected fans is about 75% (or 0.75A) for safety.

    With the SP120 LED + AF120 LED (exhausts), the total amp draw would be 0.26A + 0.40A = 0.66A
    With the two AF140's LED (intakes), the total amp draw would be 0.23A + 0.23A = 0.46A

    You can buy either two sets of these typical 2-way fan splitters with black sleeves: https://www.amazon.com/Splitter-Extension-Sleeving-Connectors-Length/dp/B00C46DX4S or, better yet, this 2-pack set with red sleeves: https://www.amazon.com/JBtek-Sleeved-Splitter-Cable-Converter/dp/B01GNT8MEM
    Reply to raisonjohn
  12. Thank you so much for the help, i've been struggling with this for a while now. i appreciate your time and help!
    Reply to CravityGaming
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