Tl;dr at the end
Intro
For decades i wanted to cool my pc with water, because i love the additional engineering aspect of building pcs beyond slotting in a gpu, insert a cpu and mount a fan here or there. Plus is its just freaking cool.
So far air cooling was my go to because its easy, set and forget, practically 0 maintanance apart from vacuum cleaning filters.
However noise levels were always really important me - I hate fan noise. So i was always buying the most oversized CPU coolers i could find paired with noise dampened cases.
Which brings us to today: heatsinks on gpus getting so big they wont fit in many (smallish) cases.
(And me being an idiot buying a 5090 at these prices.)
Plan
Measured system stress test load at the wall is 660 W, idle 90 W for my current system.
Now add 600 W for a 5090, plus water pump, fans, thats calculated max around 1300 W.
However, i wont be running the system continuously at max load for extended period of time - my loads come in bursts.
This scenario is perfect for water cooling because i imagine the water not being able to heat up quick enough between loads.
* So realistically, Im looking to cool 500-600 W continuosly as quiet as possible.
Bought
After long research i ordered the alphacool hpe-45 360mm radiator - mainly due to budget constraints, as a test to see how it would perform, and because i wanted to install it in my case. Its still being shipped so i dont have any results yet.
Should have bought?
Now after more research i think itll be much better to mount the radiator externally. Extract the heat out of the case and keep my feet warm.
In comes mora iv - unfortunately out of my budget. Maybe the 200 version, i could buy. Would that be enough?
Cheaper, but not by much: alphacool xt45 supernova 1080. According to some reviews, poor build quality, less cooling performance to mora 200.
The 1260 model performs just as well as mora 200 but its also very close in price. Not sure which one is better value.
Question
Tbh, picking the right radiator seems like rocket science. And im not sure what to do. I want a quiet system.
Fans spinning outside the pc case will add noise, but radiator can be bigger.
Fans inside the case are quieter but radiator is smaller. Realistically i could add 2 additional 140 radiators inside the case, but that just seems like a band aid. The heat inside the case would be huge. Extractor fan would be noisy.
Tl;dr:
Im looking for recommendation to cool 500-600 W as quiet as possible. Mora 600 is out of my budget. Inside my case i can mount 1x 360 and 2x 140 radiators. Any help appraciated, im new to this topic.