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Help with radiator for 3090 SLI cooling

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Joined
10 Dec 2021
Posts
1
Location
Serbia
Currently in my gaming/workstation setup i have 10900k cooled with an h150i pro xt AIO and a single 3090 ftw3 (currently air cooled) with second one arriving soon and then i plan to put both into a loop.

I have to use quadro rtx a6000 3 slot (yes quadro bridges work with regular RTX 3000 series cards) as my mobo does not support 4 slot spacing used by regular bridge for 3000 series, that means the top card will be choking so close to bottom card which has led me to explore watercooling options for my setup.

My case is Phanteks Enthoo 719, i have h150i pro xt mounted at the top of the case and at least for now i want to keep CPU on AIO and make custom loop JUST the GPUs so i wanted to know if single front mounted 360mmx30mm, single 420m or even maybe 480mm (if i can fit it due to AIO rad on top) will be good enough to cool this setup.

My case can accept 120mm rear rad, up to 360mm top, up to 360mm bottom and up to 480 front but as AIO rad is already mounted on top and i have HDD cage with two 4tb HDDs containing my project archives mounted at the bottom i can only mount radiator for GPUs in front so the max i can do is probably a single 480 but i would perfer 360, do you think a single 360 or 480 might be good enough?

As Nvidia mostly killed SLI for gaming the only times when both GPUs would be under load is when im rendering a 3D animation, for 99% of the games only single GPU would be active while second one would idle, i dont mind if PC is loud while rendering as im usually not in the same room as PC when its rendering my animations and for gaming most of the time only one gpu would be active.

Also, should i be concerned about pump and the tubing, i plan on probably using EKWB D5 pump, EKWB waterblocks and probably EKWB rad and i plan to use soft tubing and im a bit concerned if pump and tubing will be able to handle the temperature of the coolant with 2x 3090 ftw3.

I apologize for bad english, if something is hard to understand due to my bad english please let me know and i will try to clarify
 
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