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I guess you'll need to be using an AIO for that? I previously had an AIO with the 5900X, but needed to switch to air cooling to allow for enough exhaust to keep the 4090 happy

Although the 5800X3D technically has the same TDP, it seems that it pulls a lot less power for typical use, and is doing nicely with the Alpenföhn Black Ridge

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Corsair 4000D with 2 exhaust fans, Corsair 360mm AIO for my 5900X (34° C idle, 42+ with any use).

Radeon RX 6700 XT stays happy enough at 48-50°C idle and of course warmer during games.

How hot was the 4090 getting?

I didn't test it with the AIO in place, but with two Phanteks T30 fans as exhaust instead.

In that config under GPU benchmarking for ~10 mins, the 4090 runs at about 70°C for the GPU and 80°C for the VRAM

I haven't decided yet, if I can get away with air cooling the CPU that would be nice, but I'm not opposed to AIO. I won't run a 4090 in there.

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