I purchased one of these in 18mm:
https://www.amazon.com/gp/product/B097CJ1BWJ
You'll want the perfect length in order for the riser to get a good 90 degree bend for better cable management in the middle area. Get a few lengths to find what works best for you.
On the whole quieter. I run a push/pull 360mm radiator setup and only hitting mid-60s temps gaming 4k at highest settings. I also went with Linkup cables:
Sure, what GPU did you settle on. I ended up getting the Gigabyte Aero OC 4080. Is over the maximum recommended length for this case. I’m sure I’ll be able to get it to fit but will have to drill some holes in the case to make it work. I’m also considering getting a pcie riser cable that’s slightly longer than stock, hopefully this will allow me to space the GPU off the motherboard a little bit. Here is the riser cable I’m thinking of getting, it’s 18cm. The original is 14cm.
LINKUP - Ultra PCIe 4.0 X16 Riser Cable [RTX4090 RX6950XT x570 B550 Z690 Tested] Shielded High-Speed Vertical Mount Gaming PCI Express Gen4┃Dual Reverse Connectors (18cm) Designed for ITX┃White https://www.amazon.com/dp/B097CJ1BWJ?ref_=cm_sw_r_apin_dp_6VGEPGZZJ978FNQSENBD