Black Opal NV7400

As far as I can see, the old motherboard requires DDR4 RAM, so you can just reuse it. For gaming performance, the CPU is much less import than the GPU. You could replace the 5700X with the 5600X or 5600 if needed for budget reasons. The NV3 often uses QLC flash, which has low durability and becomes

The Legend 860 uses QLC flash, which has low durability and becomes noticeably slower after a few years. A better drive with TLC flash would be, e.g., the Timetec 35TTFP6PCIE, Integral M2, MSI Spatium M560, or Biwin Black Opal NV7400.

The Crucial P310 uses QLC flash, which has low durability and becomes noticeably slower after a few years. Gen3 would not make any difference in practice, but if you want a Gen4 drive, at least get a better drive with TLC flash like the Samsung 990 EVO Plus, Biwin Black Opal NV7400, Crucial T500, or

The NV3 often uses QLC flash, which has low durability and becomes noticeably slower after a few years. Get a better drive with TLC flash like the Gigabyte Aorus Gen4, Patriot VP4300 Lite/P400 Lite, Biwin Black Opal NV7400, or Kioxia Exceria Pro.

The UD90 uses QLC flash, which has low durability and becomes noticeably slower after a few years. Get a better drive with TLC flash like the Vansuny SSD or Biwin Black Opal NV7400.

The 9800X3D can be easily cooled with a single-tower cooler. To get silence, use a dual-tower cooler like the Thermalright Phantom Spirit. The NV3 often uses QLC flash, which has low durability and becomes noticeably slower after a few years. Get a better drive with TLC flash like the Seagate FireCu

It's decent. Only thing I'd change on the parts you aren't reusing is the Nvme. Look for a TLC drive for better performance and longevity. This one is $10 cheaper (if it's actually in stock) - https://it.pcpartpicker.com/product/BmQwrH/biwin-black-opal-nv7400-1-tb-m2-2280-pcie-40-x4-nvme-solid-state

The NV3 often uses QLC flash, which has low durability and becomes noticeably slower after a few years. Get a better drive with TLC flash like the Patriot P400 Lite, Timetec 35TTFP6PCIE, or Biwin Black Opal NV7400.

The NV3 often uses QLC flash, which has low durability and becomes noticeably slower after a few years. Get a better drive with TLC flash like the Patriot P400 Lite/VP4300 Lite, Timetec 35TTFP6PCIE, Biwin Black Opal NV7400, or WD Blue SN5000.

The QN450 uses QLC flash, which has low durability and becomes noticeably slower after a few years. Get a better drive with TLC flash like the Patriot P400 Lite, Patriot Viper VP4300 Lite, or Biwin Black Opal NV7400, or, if you're buying at Micro Center, TN320/Spatium M450/990 EVO Plus.