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I used ITX mobo (ROG B550-ITX). The RTX 4090 Suprim Liquid X can fit easily if you replace the AIO fans with 1.5cm models (instead of stock 2.5cm ones). This will leave a solid 1cm between the AIO fans and the GPU.The case is large enough to fit 120mm AIO for the CPU if you orient its pump vertically. Horizontally all 120mm AIOs are the same size. The only thing you have to look out for is the pipe connector type and pipe lengths. Ideally you want straight pipe connectors leading into the CPU rig, and rotating ones on the heatsink. I used NZXT Kraken 120 and it worked out okay. The problem is, 120mm AIO just isn't ideal for cooling very hot CPUs. I ended up falling back to air cooled solution and disabling boosting of my CPU to cap it at 85W. It's good enough performance wise, runs quietly, less crammed and doesn't risk leaking.PSU can be ATX and you can even use that 12VHPWR to ATX-2.0 power adapter, but wiring will be super crammed and dissassembly of the PC will be very hard. Proper ATX-3.0 SFX PSU is better obviously.I spent entire 2023 modifying my N-ATX so I know exactly what hardware fits in it. I ultimately had to sell my 4090 since I defended my Masters and no longer needed that much power, expecially since that 12VHPWR connector made it a fire hazard. Now I'm rocking my trusty RTX 3090 with additional fan array for exhaust. It's really killing me I didn't take any pictures of my 4090 setup before I sold it.If you really think that way then I got bad news for you. Custom PC building scene with custom made cases is pretty much trial and error. That's kinda the whole point of it and that's how we get kicks from it.
I used ITX mobo (ROG B550-ITX). The RTX 4090 Suprim Liquid X can fit easily if you replace the AIO fans with 1.5cm models (instead of stock 2.5cm ones). This will leave a solid 1cm between the AIO fans and the GPU.
The case is large enough to fit 120mm AIO for the CPU if you orient its pump vertically. Horizontally all 120mm AIOs are the same size. The only thing you have to look out for is the pipe connector type and pipe lengths. Ideally you want straight pipe connectors leading into the CPU rig, and rotating ones on the heatsink. I used NZXT Kraken 120 and it worked out okay. The problem is, 120mm AIO just isn't ideal for cooling very hot CPUs. I ended up falling back to air cooled solution and disabling boosting of my CPU to cap it at 85W. It's good enough performance wise, runs quietly, less crammed and doesn't risk leaking.
PSU can be ATX and you can even use that 12VHPWR to ATX-2.0 power adapter, but wiring will be super crammed and dissassembly of the PC will be very hard. Proper ATX-3.0 SFX PSU is better obviously.
I spent entire 2023 modifying my N-ATX so I know exactly what hardware fits in it. I ultimately had to sell my 4090 since I defended my Masters and no longer needed that much power, expecially since that 12VHPWR connector made it a fire hazard. Now I'm rocking my trusty RTX 3090 with additional fan array for exhaust. It's really killing me I didn't take any pictures of my 4090 setup before I sold it.
If you really think that way then I got bad news for you. Custom PC building scene with custom made cases is pretty much trial and error. That's kinda the whole point of it and that's how we get kicks from it.