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Correct approach to plug a 240mm aio in with NZXT G12

Discussion in 'Watercooling' started by Guptilious, 21 Dec 2020.

  1. Guptilious

    Associate

    Joined: 21 Dec 2020

    Posts: 5

    Hi,

    PC Specs
    OS - Dual boot of Ubuntu 20.04 and Windows 10
    Case - Cougar QBX
    CPU - AMD Ryzen 9 3900x
    CPU Cooler - H100i XT ( sits on top of the case
    Motherboard - Asus Strix B550-I ITX
    GPU - 1080ti
    PSU - Corsair SFX 600W

    I recently won on ebay a 1080ti that had the G12 adaptor and a corsair H55 attached to it.

    Looking at the the new gpu it doesn't have any of the fans connected to the gpu board (H55 aio fan or the small NZXT fan attached to the board). I've managed to give power to everything via my motherboard chassis 4 pin - which has a 1 to 5 4 pin adaptor, but the gpu believes it's fans aren't running at all (guessing due to nothing being connected). In addition to this the fans for this gpu are running all the time but I'd like to shut them off at idle or atleast be able to control them via my gpu temps software.

    I'm planning to replace the H55 with a supported 240mm aio so I can run the fans lower and hopefully get rid of the old pumps loud coil whine. But before doing something that might now work I wanted to confirm what the best approach is to connect everything up.

    At current I have a 240mm aio used by my CPU which uses my motherboards onboard USB 2.0 header, the aio 4 pin header and the CPU 4 pin header (using the Y cable provided by corsair to power both fans).

    So questions:
    • If I were to connect a newer model 240mm aio to the G12 am I correct thinking I can attach the USB 2.0 header to my USB 3.0 header on the motherboard, using an adaptor?
    • From there can I power the pump via my chassis 1to5 4 pin adaptor and plug the 2 aio fans into the GPU (as there are 2 3 pin headers) or should these also just remain plugged into the 1to5 adaptor, whilst the G12 fan is plugged into the board?
    • Finally would I need to use the small G12 fan that's been provided, given my ITX case has the GPU pretty low to the case base and I could have a 120mm fan applied to the case base pulling air in and onto the GPU, which I'd assume would be quieter and more efficient than running a small fan?
    [​IMG]
     
  2. Ross Thomson

    Wise Guy

    Joined: 7 Nov 2017

    Posts: 1,305

    When I had my G12 I bought an adaptor to join the 120mm fans from the AIO to the card so I could control it via afterburner. The small fan on the G12 does the job of cooling the VRM. I would keep it on. you can always change it to a quieter one. I put a noctua one on mine but would go for one of the Arctic P9 fans to fit.
     
  3. Guptilious

    Associate

    Joined: 21 Dec 2020

    Posts: 5

    Did you also decide to attach the 90mm fan to the card or did you opt for running it into the motherboard. I've got a Noctua NF-B9 kicking around so was thinking to replace the stock one with this.
     
    Last edited: 22 Dec 2020
  4. Ross Thomson

    Wise Guy

    Joined: 7 Nov 2017

    Posts: 1,305

    ran the small fan off the mobo at a constant speed
     
  5. Guptilious

    Associate

    Joined: 21 Dec 2020

    Posts: 5

    Awesome thanks for the help, I've got everything installed and configured how you suggested and I've got the fan speeds appearing now for my GPU. I installed 2 NF-F12's on the radiator and I had to buy an adapter as I didn't realise the GPU header was different.

    An issue I'm now encountering is that I can't seem to drop my RPM below 1000RPM but I can increase them (regarless of if I try the stock fans, a notua Y cable or the stock one included).
    Do you know if you have similar issues with your set up or if maybe the adapter I got could prevent me from being able to drop things lower and quieter?
     
  6. Ross Thomson

    Wise Guy

    Joined: 7 Nov 2017

    Posts: 1,305

    My fans did stop when the temp was low but I adjusted them to be on low because I didn't want the coolant temp to be high. My fans went down to 200rpm at their lowest.
     
  7. Guptilious

    Associate

    Joined: 21 Dec 2020

    Posts: 5

    Weird. Don't suppose you have the link to the adapter that you used for your build? Might be an option for me to try out, as the noctua fans should be capable of going as low as 300RPM.
     
  8. Ross Thomson

    Wise Guy

    Joined: 7 Nov 2017

    Posts: 1,305

    Gelid Solutions 4 Pin PWM Adaptor Cable for VGA Graphics Card Cooler Fans.
     
  9. MikeTimbers

    Soldato

    Joined: 18 Oct 2002

    Posts: 7,465

    Location: New Eltham, London

    If I were you I'd simply ensure the pump is on full and the fans are set to an inaudible level via the motherboard connectors (so long as this cools sufficiently). Then just leave them alone. A 240mm radiator is far more cooling than a 1080ti needs unless you're trying to break world records.
     
  10. Guptilious

    Associate

    Joined: 21 Dec 2020

    Posts: 5

    Interesting, any reason why you'd have the pump on full? I found the sound from the pump in the current set up is quite annoying myself, so preferred to have it in the silent mode, with the aim of the fans also being low. I agree that the 240mm is overkill but I found the tube length on the H55 caused some issues with tubes being 'bent' together so I was more concerned by the water not flowing around.

    If the fan connect replacement doesn't solve the adjustment issue I will probably go the route your suggesting and control everything via the motherboard connectors.
     
  11. MikeTimbers

    Soldato

    Joined: 18 Oct 2002

    Posts: 7,465

    Location: New Eltham, London

    Surprised you can hear the pump. I have a couple of these G10/G12 combos and can't hear the pumps on either of them. Mind you, I'm lucky enough to no longer have young enough ears to hear coil whine :)

    I have one in my bedroom and can't hear it over my partner's snoring (every marriage is made up of two people who think only the other one snores). I have one in my living room but since there is also two DDC and one D5 plus over a dozen fans I guess it's not surprising I'm happy to run a couple of AIO on full pump.