[D] ML/DL computer build with PCIe 5.0 x8 lanes for RTX 3090

I'm building my first ML/DL computer around [ASUS ProArt Z690 motherboard](https://www.asus.com/Motherboards-Components/Motherboards/ProArt/ProArt-Z690-CREATOR-WIFI/techspec/), which has 2 PCIe 5.0 slots (x8 each) and PCIe 3.0 x16 slot. The CPU is i9-12900K, which comes with 20 PCIe lanes. Since 4 lanes will go to a single NVMe, I think the motherboard will split the two PCIe 5.0 slots into 8x lanes each. My current build is with a single RTX 3080 12GB, but I want to be able to upgrade to 2x3090Ti (or 2x4090) …

computer dl machinelearning ml rtx 3090