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Phanteks P400 TG + Corsair H100i V2 - Optimal Airflow

Hello,I own the Phanteks P400 Tempered Glass and I recently got an H100i V2 liquid cooler.My other hardware is an i5 3570k at 4.5 ghz,16gb of ram,a Sapphire Nitro Rx 480 and an 1tb ssd.
While my temps aren't that bad,I'm trying to find the optimal fan setup to improve the airflow while reducing the noise at the same time.i plan to change the stock corsair fans(too loud) for the h100i V2 with two Noctua NF-F12 pwm and I would like to hear your suggestions about the case fans.Im not gonna keep the stock phanteks fans,so which fans do you suggest for my case?should I buy 2 fans(one front Intake and one back exhaust),or do I need to add fans to the top too?i value silence and performance and definitely no led fans.

Thanks in advance
Reply to yiankat13
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More about phanteks p400 corsair h100i optimal airflow
  1. Well where are you placing your h100i? Top or front?
    As for silence and performance, they're opposites so you rarely get one without sacrificing some of other. It's up to you to determine how much that is.
    Try the h100i in both positions, top and front, as position can have big effect on temperatures but it'll vary with case, and fans and type of video card so best test it.
    If mounted at the front you should then have 1 to 2 exhaust fans. One behind the cpu at the back of the case, and optionally one more above it in the top slot. If you're mounting top, you're still going to have the 1 exhaust in the back, try and mount 3 to the front, you'll be grateful for the extra cool intake.
    Finally, front panel will restrict a lot of your airflow and increase your temps, but will also silence some of the fan noise. If you ever find you're worried about temps, take it off, and they should drop significantly (of course your ears might suffer but should be worth it on the hot days).
    Before you start all this, check how many fan headers you have on your motherboard, and decide if you have enough for the number of fans you're going with, and if you're going with DC or PWM fans (ultimately you should be able to control both so don't worry too much just check if motherboard fan headers are all 4 pin or some are 3 pin). Then set up your fan curves so your fans are quiet on idle and ramp up when you're on load.
    Reply to Sedivy
  2. You can't watercool in the top in the P400S, which is what makes it a terrible case for water cooling given it's already meh airflow.
    Reply to Chugalug_
  3. Yeah,what chugalug says is true,but still,since I already have both the case and the cooler,what's the best way to setup my fans?how many and what kind of them?do I need a static pressure or an airflow fan for the front intake?would it make a difference if I added exhaust or intake fans on the top mounts(the case has has a dust filter there).
    Reply to yiankat13
  4. Best answer
    Oh he's right. No top water cooling for you.
    Well in that case you strap a front radiator, check if you can fit in the third fan (I don't think so, not with the added width of the radiator but I could be wrong so double check).
    Then try and have somewhat balanced airflow, slightly tilted to positive. So two fans in (if only radiator up front), then two fans out, one behind and one on top of cpu. Software that comes with the aio liquid cooler should allow you to control cpu temps and therefore fans on the radiator based on a temp curve. Then you just need (usually a utility that comes with a motherboard manufacturer) a utility that controls your chassis fans. Try to set them up so that you get decent temps, but also so they don't spin harder than the two front fans (thereby creating negative pressure).
    Static pressure fans do well when there's something impeding the airflow like radiator or filter. That being said, they should come on the aio liquid cooler so I don't think you need additional purchase there?
    If you add 3 fans for exhaust (top is always exhaust in cases with this orientation), and 2 to intake, that's negative pressure, so extra air is coming in the back through the cutouts that are not covered with filters ie. extra dust. So no, keep it balanced, slightly positive. If you do add the third fan to the front, then think about the third exhaust fan up top.
    Ultimately experiment. Fans are easy to install and so installing and then testing temps each time will best tell you what you can expect.
    Reply to Sedivy
  5. That's very helpful.so I'm gonna have the two Noctuas F12 of the radiator as intakes and I'm gonna add one more 12cm fan as front intake fan.i'll also add two exhaust fans,one behind the CPU and one above it.which fans do you suggest?i'm looking for something cheaper than the Noctuas if possible
    Reply to yiankat13
  6. Noctua's fans are best quality and typically lauded as best sounding and so once you start looking into fans, you see why. Some fans will skimp you on the extension cables (nightmare to connect to motherboards sometimes without these), some will not give you anti-vibration pads or those gummy screws that serve the same purpose. Some will skimp you on the splitter cable (which granted you may not need) and so on. So keep in mind that this all factors into the price and just cause something's cheaper doesn't actually mean it really is if you have to buy additional stuff for it. Also keep an eye on the type of bearing and warranty on the fan, and check out youtube video for a test of what it sounds like at high RPM.

    Keeping all that in mind, if you have space to add 3rd front intake fan, make it also a static pressure one like your F12 or the less intense version P12 from noctua. Other companies also have static pressure versions. If you can get a pwm, do, as they're a little more responsive to temp/rpm curves but it's not a must at all, any dc fan will do as well. Here's a list:
    https://pcpartpicker.com/products/case-fan/#s=120
    Personally I went with CM's masterfan pros pwm for static pressure ones at front of the case, but that's entirely personal preference. They didn't come with an extension cable which was a headache and had no separate vibration pads but had decent cooling performance, and responded well to changes in temp.
    For back of the case you can go with air flow fans.
    Other than that it's a matter of your budget and what you're willing to skimp on.
    Reply to Sedivy
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