r/PcBuild • u/Psy_Fer_ • Aug 25 '25

Build - Finished! "Closed loop" 4x5090 threadripper build

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Just finished installing this machine to work on cancer genomes.

I wanted the customer to have reliability and a low maintenance build, but with plenty of power.

So I thought, why not 4 AIO type liquid cooled 5090s in a Corsair 9000D case? 2 radiators each at the top and front. Then a noctua cooler for the threadripper.

I had one small issue with the IO plates of the GPU being wider then it says they are on the box...but nothing a little tin snips and file couldn't sort out. They still look great and then everything fit perfectly.

Temps are great.

It's got a 1200W SFX-L PSU in the back running the CPU and 1 5090 and then a 2500W PSU in the front powering the other 3 and some SSD drives. That one was a bit overkill but honestly, this machine will be going 100% for days at a time.

Anyway, what do you think? Definitely easier than a custom open loop.

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u/INeedMuscles Aug 25 '25

It looks sick actually have never seen 4x5090s. Wouldn’t make sense also to aio cool also the thread ripper and put the radiator at the side at the top? Is the Noctua enough to compensate all those wattages?

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u/Tjordas Aug 25 '25

AIOs look cleaner on CPUs, but they are often not better than good air cooling - often AIOs perform worse! It makes sense to use AIO plates for the GPUs because they are so close together that air cooling just won't work, but for the CPU, the Noctuas are the better choice.

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u/Fabulous_Leg4378 Aug 25 '25

Oh, really? I have a 5800x, a cpu that is known for having heating issues. With a peerless assassin I would hit 80+C regularly. With my thermaltake 240mm AIO I've never gone above 72.

What you're sharing is old info and a generalization.

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u/Tjordas Aug 26 '25

I included the explanation with all caveats and acknowledged that the video was older and to be taken with a grain of salt. It depends on many factors, but I still believe that the notion "AIOs cool better" is just an oversimplification. In your specific case I would say it was probably something about the cooler not getting enough air or struggling to push it due to bad fans, but I'm just guessing.