My first custom water cooling loop! I was able to fit two 280 slim Alphacool HPE-20 radiators in this Meshroom S case and the performance has been great.

Was the performance worth the cost of all the new gear? Technically no, the 4090 never throttled to begin with on air and the 7950X3D would only slightly throttle under synthetic loads when it was under a 280 AIO. I mostly did this as a hobby and to just squeeze out that tiny bit of performance from the CPU and to be quieter under load.

4090 1.0v undervolt load temps:

Stock air cooling - 72c

Watercooling loop - 59c

7950X3D with individual CO undervolt:

Corsair 280 AIO - 89c (135w - 140w sustained)

Watercooling loop - 78c (150w - 155w sustained)

Watercooling components:

2x Alphacool HPE-20 slim 280 radiators

2x BeQuiet SWP4 Pro 140mm fans on front rad

2x Silverstone Air Slimmer 140mm fans on side rad

Alphacool Core 4090 Suprim water block

Heatkiller IV CPU water block

Heatkiller 16/10 EPDM tubing

Aquacomputer D5 Next pump w/ Ultitube adapter

YSX-6PC 50mm reservoir (Smallest res I could find. On Amazon for ~$15)

Aquacomputer Double Protect Ultra Coolant

6x Alphacool 16/10 90 degree rotatable compression fittings

4x Alphacool 16/10 rotatable compression fittings

4x Alphacool 90 degree rotatable (both ends) male to female fittings

1x Barrow 90 degree rotatable (one end) male to female adapter (Used on the reservoir fill port, non-rotatable female end is easier for unscrewing the stop plug)

1x Barrow 20mm extension fitting

1x Barrow 3-way block splitter fitting

2x Alphacool stop plugs