Question Corsair Hydro X Series XH303i for 5900x+3080ti?


Nov 6, 2002
Hey guys,

I'm very interested in doing my first custom water cooling on my new PC to water cool both CPU and GPU. Main reasons are to reduce CPU temp (which goes up to 90C) and overall GPU fan noise under load.

My PC config as follow:
Ryzen 9 5900x with cooler master 360 AIO
RTX 3080 Ti Zotiac Amp Holo
SL600M Cooler master Case (like this one:

Due to the weird case design, I think a small pump/reservoir would be Ideal. So I was considering the Corsair Hydro X Series XH303i (

I would have gone with the EK-Classic Kit S360 D-RGB as it's cheaper and has soft tubing, which is easier to install, but not really sure about the size and flow of the pump in the kit.

Would really be helpful if, based on your experience, someone could tell me:
1- Would something like the Corsair Hydro X Series XH303i kit with it’s small pump/reservoir combo would suffice in effectively cooling my system?
2- If I need more volume for reservoir, would you recommend the EK kit? or should I got with Hydro X iCUE XH305i kit ( or TT Pacific C360 DDC Soft Tube Water Cooling Kit (
3- Would one 360/30mm rad is enough?

NOTE: GPU block ordered separately from corsair.
Thanks a lot